Mon, 03/16/2015 - 17:27
http://www.aavso.org/requesting-monitoring-bright-new-nova-sagittarius
An interesting and straightforward target for the Star Analyser if (unlike me) you are far enough south
Robin
http://www.aavso.org/requesting-monitoring-bright-new-nova-sagittarius
An interesting and straightforward target for the Star Analyser if (unlike me) you are far enough south
Robin
Hi Robin,
We have gratings on both BSM South (Melbourne) and BSM Berry (Perth). Unfortunately, both sites have been cloudy! When it clears, I'll have the nova on their monitoring queue. The eShel is also installed at Mt. John, and could do something this bright on the 61cm. I'll see if we can get some time to try it out.
Arne
Hi Arne,
Christian Buil has just posted an R ~11000 echelle spectrum using 200mm aperture from South of France.
http://www.spectro-aras.com/forum/viewtopic.php?f=5&t=1108&p=4989#p4989
It will be interesting to see how far it can be followed at high resolution from more southerly observatories.
Robin
Here's my first effort on this target, with the 150 l/mm grating on mt Spectra-L200, Dispersion is about 3.8 A/pixel, with resolution R=260.
Cheers
Jonthan
Here is 2 hrs data on the region 4770-5190, showing the H Beta and several of the iron lines. JD 2457098.2097
Ejecta velocity c.1100 km/s in this spectrum.
Cheers
Jonathan
Jonathan, very well done!
I have one of the SA 200's but I'm under cloud (what is left of Tropical Cyclone Pam) I'm afraid!
- Carl.
I think
Well done Jonathan!
I think these respesent the first (of many!) amateur spectra of the Nova.
The "iron curtain" is very similar to the recent Nova Cen.
Excellent results.
A nice Star Analyser spectrum of this nova from South Africa by Jerome Jooste
https://groups.yahoo.com/neo/groups/staranalyser/conversations/messages…
Robin
Hi,
I planned a couple of days ago to take a SA200 spectrum of the new nova, but since then evn in Chile there are clouds.
So far hence no spectrum. Maybe during this night or I hope at least somewhen in the weekend it should be able to work out.
Josch (HMB)
Using a SA100 grating on a 200mm telelens gave good results - This is from Rob in regional Victoria, Australia.
http://www.iceinspace.com.au/forum/showthread.php?t=132920
Here is a low-resolution spectrum from 18-3, and a comparison of the central section of the low-res spectra from 18-3 and 16-3. Interesting to observe the deepening of the P Cyg profiles and the reduction in expansion velocity over those two days.
I have a higher resolution (R=8000) spectrum of the 6800-7200 to process from last night.
My spectrum of the H_beta region from 2015/Mar/20.634. R ~ 9000.
Seems to still be brightening, I made a visual estimate at 4.9 at the time I was taking this.
Hi All,
Looking at the observations being reported to the AAVSO for N Sgr 2015 no.2 (000-BLP-536), this nova has continued to brighten to about 4.5v with no indication the maximum has been reached yet. According to available VSX data on all other novae that have been observed in Sgr since about 1898 (there are many) , our current bright example may end up breaking a maximum apparent magnitude record for novae in Sagittarius currently held by V1059 Sgr (Na1898, max 4.5:p) and V630 Sgr (Na1936, max 4.5p in the Downes Catalog and other VSX references). I'm not sure where the VSX magnitude 1.6 maximum quoted for V630 Sgr comes from. Perhaps someone knows.
Steve
Here is a low-resolution (150 l/mm, R=c.700) spectrum from last night:
It's extraordinary how much change there has been. The emission lines have all but disappeared - seemingly swamped by deep, broad P Cygni absorption lines. Predominant lines appear to be CI, OI, and FeII. I'm not sure what the strong absorption feature is at 5875 - I'm guessing it's the NaI at 5890 blueshifted.
I've never seen a P Cyg profile like the one at Ha.
There is a HeI line at 5876 which is usually in absorption in nova-likes. I can't see your spectrum though - is there a link where it is displayed?
Thanks,
Stella.
I've been told the image didn't come out in my last post. Trying again:
Hi all,
For public use suggest measurement series on the all sky camera images.
PNV J18365700-2855420 2457109.23403 2015 Mar 27.7340 5.12 0.05 CV SAO 210509 SAO 210857 K N all-sky photometry, limit= 6.8m, STARRY SKY!!
PNV J18365700-2855420 2457108.73403 2015 Mar 27.2340 5.25 0.07 CV SAO 210857 SAO 186838 K N all-sky photometry, limit= 5.4m, ZIRRUS !!!
PNV J18365700-2855420 2457108.76181 2015 Mar 27.2618 5.19 0.07 CV SAO 210857 SAO 186838 K N all-sky photometry, limit= 6.0m, ZIRRUS !!!
PNV J18365700-2855420 2457108.25000 2015 Mar 26.7500 5.6 0.12 CV SAO 210857 SAO 186838 K N all-sky photometry, limit= 6.3m, ZIRRUS !!!
PNV J18365700-2855420 2457107.90417 2015 Mar 26.4042 5.68 0.05 CV SAO 210857 SAO 186838 K N all-sky photometry, limit= 6.7m, STARRY SKY!!
PNV J18365700-2855420 2457107.25347 2015 Mar 25.7535 5.95 0.05 CV SAO 210857 SAO 186838 K N all-sky photometry, limit= 6.9m, STARRY SKY!!
PNV J18365700-2855420 2457107.30903 2015 Mar 25.8090 6.12 0.1 CV SAO 210857 SAO 186838 K N all-sky photometry, limit= 6.7m, STARRY SKY!!
PNV J18365700-2855420 2457106.84375 2015 Mar 25.3438 6.0 0.12 CV SAO 210857 SAO 186838 K N all-sky photometry, limit= 6.4m, ZIRRUS !!!
PNV J18365700-2855420 2457106.28194 2015 Mar 24.7819 5.85 0.12 CV SAO 210857 SAO 186838 K N all-sky photometry, limit= 6.7m, STARRY SKY!! ZIRRUS???
PNV J18365700-2855420 2457105.85625 2015 Mar 24.3563 5.7 0.12 CV SAO 210857 SAO 186838 K N all-sky photometry, limit= 6.4m, ZIRRUS !!! STARRY SKY.
PNV J18365700-2855420 2457105.85625 2015 Mar 24.3563 5.8 0.1 CV SAO 210857 SAO 186838 K N all-sky photometry, limit= 6.4m, ZIRRUS!!! STARRY SKY.
PNV J18365700-2855420 2457105.31667 2015 Mar 23.8167 5.84 0.07 CV SAO 210857 SAO 186838 K N all-sky photometry, limit= 6.9m, STARRY SKY!!
PNV J18365700-2855420 2457105.23264 2015 Mar 23.7326 5.62 0.1 CV SAO 210257 SAO 210116 K N all-sky photometry, limit= 6.7m, STARRY SKY!!
PNV J18365700-2855420 2457104.88542 2015 Mar 23.3854 5.3 0.12 CV SAO 210509 SAO 210257 K N all-sky photometry, limit=5.7m, ZIRRUS!!! ZENIT !!!
PNV J18365700-2855420 2457104.17222 2015 Mar 22.6722 4.95 0.12 CV SAO 210509 SAO 210257 K N all-sky photometry, limit= 5.4m, ZIRRUS !!!!
PNV J18365700-2855420 2457103.83681 2015 Mar 22.3368 5.05 0.12 CV SAO 210509 SAO 210257 K N all-sky photometry, limit= 5.9m, ZIRRUS !!!
PNV J18365700-2855420 2457103.23611 2015 Mar 21.7361 4.55 0.05 CV SAO 210509 SAO 210257 K N all-sky photometry, limit= 6.9m, STARRY SKY!!
PNV J18365700-2855420 2457103.26181 2015 Mar 21.7618 4.58 0.07 CV SAO 210509 SAO 210257 K N all-sky photometry, limit= 7.0 m, STARRY SKY!!
PNV J18365700-2855420 2457103.32083 2015 Mar 21.8208 4.63 0.05 CV SAO 210509 SAO 210257 K N all-sky photometry, limit= 6.2m, STARRY SKY!!
PNV J18365700-2855420 2457102.90417 2015 Mar 21.4042 4.55 0.05 CV SAO 210509 SAO 210257 K N all-sky photometry, limit= 6.3m, STARRY SKY!!
PNV J18365700-2855420 2457102.88542 2015 Mar 21.3854 4.5 0.1 CV SAO 210509 SAO 210257 K N all-sky photometry, limit= 6.9m, STARRY SKY!!
PNV J18365700-2855420 2457102.85208 2015 Mar 21.3521 4.58 0.05 CV SAO 210509 SAO 210257 K N all-sky photometry, limit= 6.9m, STARRY SKY!!
PNV J18365700-2855420 2457102.84167 2015 Mar 21.3417 4.73 0.05 CV SAO 210509 SAO 210257 K N all-sky photometry, limit= 6.7m, STARRY SKY!!
PNV J18365700-2855420 2457102.27014 2015 Mar 20.7701 4.86 0.07 CV SAO 210509 SAO 210257 K N all-sky photometry, limit= 6.9m, STARRY SKY!!
PNV J18365700-2855420 2457101.81944 2015 Mar 20.3194 4.97 0.07 CV SAO 210509 SAO 210257 K N all-sky photometry, limit= 6.4m, ZIRRUS
PNV J18365700-2855420 2457101.24444 2015 Mar 19.7444 5.36 0.05 CV SAO 210257 SAO 210116 K N all-sky photometry, limit= 6.9m, STARRY SKY!!
PNV J18365700-2855420 2457100.80556 2015 Mar 19.3056 5.42 0.07 CV SAO 210257 SAO210116 K N all-sky photometry, limit= 6.3m, ZIRRUS
PNV J18365700-2855420 2457100.27083 2015 Mar 18.7708 5.55 0.07 CV SAO 210116 SAO 187024 K N all-sky photometry, limit= 6.9m, STARRY SKY
PNV J18365700-2855420 2457100.21944 2015 Mar 18.7194 5.63 0.07 CV SAO 210116 SAO 187024 K N all-sky photometry, limit= 6.9m, STARRY SKY
PNV J18365700-2855420 2457099.89444 2015 Mar 18.3944 5.68 0.07 CV SAO 210116 SAO 187024 K N all-sky photometry, limit= 6.3m
PNV J18365700-2855420 2457099.81667 2015 Mar 18.3167 5.82 0.07 CV SAO 210116 SAO 187024 K N all-sky photometry, limit= 6.4m
PNV J18365700-2855420 2457099.31597 2015 Mar 17.8160 5.73 0.07 CV SAO 210116 SAO 187024 K N all-sky photometry, MOON, limit= 6.6m
PNV J18365700-2855420 2457099.23611 2015 Mar 17.7361 5.77 0.1 CV SAO 210116 SAO 187024 K N all-sky photometry, limit= 6.9m
PNV J18365700-2855420 2457098.85069 2015 Mar 17.3507 6.35 0.1 CV SAO 210116 SAO 187024 K N all-sky photometry, MOON, STARRY SKY, limit= 6.5m
PNV J18365700-2855420 2457098.87847 2015 Mar 17.3785 6.3 0.1 CV SAO 210116 SAO 187024 K N all-sky photometry, MOON!, ZIRRUS!!!, STARRY SKY, limit= 6.6m
PNV J18365700-2855420 2457098.27431 2015 Mar 16.7743 5.6 0.12 CV SAO 210116 SAO 187024 K N all-sky photometry, MOON!!!!, ZIRRUS !!!, STARRY SKY, limit= 6.8m
PNV J18365700-2855420 2457097.83472 2015 Mar 16.3347 5.9 0.12 CV SAO 210116 SAO 187024 K N all-sky photometry, MOON!!!!, STARRY SKY, limit= 6.7m
PNV J18365700-2855420 2457097.23611 2015 Mar 15.7361 6.4 0.2 CV SAO 187024 K N all-sky photometry, MOON!!!!, STARRY SKY, limit= 6.6m
PNV J18365700-2855420 2457096.84375 2015 Mar 15.3438 6.0 0.2 CV SAO 186838 K N NOVA - OK!, all-sky photometry, MOON!!!!, STARRY SKY, limit= 6.2m
PNV J18365700-2855420 2457094.87500 2015 Mar 13.3750 <4.7 CV SAO 186328 K N all-sky photometry, MOON!!!!, STARRY SKY, limit= 4.7m
reply delete ....
I see there is photometric data being collected on this nova, but no spectra???
Surely there must be some members actively using the gratings??
Attached is my SA-200 data. Unfortunately my configuration only allows 21 A/pixel resolution..
Gordon
[quote=Ken4optics]
I see there is photometric data being collected on this nova, but no spectra???
Surely there must be some members actively using the gratings??
[/quote]
I can not in the theme of the series showed photometry? :-)
Jim's recent ALPY spectrum shows reasonable data for comparison.
https://groups.yahoo.com/neo/groups/astronomical_spectroscopy/conversations/messages/11484
At your lower resolution, I think you are still registering the Fe "hump", and the obvious changes to the Ha and Hb regions. Obviously higher resolution would help, but a good spectrum nevertheless.
Hi,
I am taking daily images with the grating remotely from Chile.
Regards,
Josch
That sounds very
Josch,
That sounds very interesting.
Do you have any results to share?
Surprised not to see anything from BSM South or BSM Berry yet. These small scopes will work better with the SA200 in a filter wheel than a larger scope on a bright target like this, giving higher resolution.
Robin
I've been posting my higher-R spectra over on the thread in the nova page recently.
Here are a set of my low-res (R= c.700) spectra of the nova to date. They are taken with the 150 l/mm grating on my Spectra L200. They are rectified (continuum removed). The middle spectrum (22/3) corresponds with the light-curve maximum; almost all the emission lines have vanished with the exception of H alpha.
Prominent emission lines (with P Cyg profiles) emerging since maximum are the Balmer lines, the Fe II lines 4472-4635, 4923-5425, and 6147-6247, the NaI doublet at 5890-95 (a single line at this R), the OI lines at 6158, 6456, 7773 and 8446, and the CaII triplet 8498-8542-8662. Prety much what you'd expect at this stage of a classical Fe nova.
I still find these brightness oscillations around maximum very interesting, and keep looking for an explanation. Steve SHore talked about X-Ray pulsing in his last update to Francois ...
Cheers
Jonathan
Hi,
has anyone observed the nova spectroscopically last night? The nova spectrum has changed drastically from two nights before observing with an SA200 remotely.
The Fe lines dropped strongly around 5200 A.
Two spectra are attached.
Josch
A nice Star Analyser 200 spectrum of this nova from Madrid, (Spain)
made from 30x30-sec exposures with an ST-8XME and LX200 25cm
Unfortunately my configuration only allows 15.5 A/pixel resolution..
RSpec software.
The star magnitude was at V=10.72 +-0.05.
DATE MAG +/-
-------- ------------ ---------
20150720.989 10.72V 0.05
Regards
Diego Rodriguez
Nova Sgr 2015b = V5668 Sgr
I have taken a low-resolution (SA 200) spectrum of this nova
Strong [O III] profiles evident.
My configuration only allows 15 A/pixel resolution.
OBJECT DATE MAG
------ ------------ -----
V5668 SGR 20150910.882 9.08V
regards
Diego Rodriguez
Here is my first effort for this Nova. SA200, 200mm Schmidt-Newtonian, Atik 4000. 17 Sept 2015 03:54 UT from Kenton OK (Okie-Tex Star Party). 180 second integration. ISIS reduction. Polynomial fir RMS = 1.74, Resolution 43.2. I think I have most of the lines correct, but please give me feedback.
Ed
I was able to get two clear nights on this before it set into the sun......shot from Mt. Pinos, Ca (2,500 meter elevation) with a 33 Cm reflector with a L-200 spectrometer attached using a ST-10XME as a detector. Shot 3x120sec exposure at three different micrometer settings to get the full visual spectrum. Object was hard to visually identify, but once the spectrum was seen, it was an obvious nova target....lots of emission lines!
http://www.astroimage.info/images/Nova%20V5668%20Sgr%20Spectrum-08Nov15a.jpg
I'll try to post this on the spectra section in AASVO as soon as I finish 09Nov15 data.
James
Hello all,
The spectra presented here are really great; they showcase the evolution of the nova. I wonder if we can collectively make a time-evolution study of the observed ejecta velocities! I wonder how accurate wavelength calibrations are; what are you using to detemine your wavelength scale? Please note that, becasue of ejecta kinematics, emission lines from the star are not appropriate for wavelength calibrations here (especially as lines are asymmetric...
Best wishes - clear skies,
Stella.
For calibration I
Hi Stella,
For calibration I use a neon-argon-xenon lamp mounted at the objective lens of the telescope. I take a calibration frame at the beginning and end of the observing run that captures both the calibration lines and the target spectrum. I aim for at least a third-order polynomial calibration from at least five lines: particularly right down the blue end, the calibration is not linear.
It tends to be pretty accurate!
Cheers
Jonathan
To: Stella
RE:"...Please note that, becasue of ejecta kinematics, emission lines from the star are not appropriate for wavelength calibrations..."
Point taken! I was using RSpec's nebula lines and the H-Alpha & H-Beta to get a calibration. I'm going to re-calibrate them using only the telleric lines to see if I can get a more accurate line spectrum. Unfortunately, my L-200 Littrow spectoscope did not come with a working Neon source, so I'm mostly using A(3-5)v stars as a calibration. I have a good set of Vega shots I took right after the V5668 Sgr Nova series, however, because the Nova was so low compared to Vega, I'm relutant to use RSpec's 1-point calibration. Here is a link to a .jpg file I made of the spectrum .fits file data:
http://www.astroimage.info/images/V5668%20Sgr-6x120s-12x2-8&9Nov15-FJQ.jpg
09Nov15's data had better seeing obviously.
James
Thanks for
Hello James,
Thanks for sharing your spectra. Balmer lines seem bright and broad - nice work! I am wondering if there is a way to add an external HeNeAr source to your system for future calibration needs (something to think about). I am looking forward to seeing your 1-d spectrum with new calibrations.
Best wishes - clear skies,
Stella.
Here is my recalibrated spectrum based on 3 atmospheric telluric lines that I was able to detect: http://www.astroimage.info/images/V5668%20Sgr-micro1205slit6-3x120sec2x2-09Nov15rTELLURICprofile.jpg
Using the NaI, OI, & OH telluric lines at 5890A, 6300.3A, & 6863.95A respectively with Rspec, I was able to get a 1st order polynomial fit of 1.2432 rms and a 2nd order of 0.00 on the spots I assigned these line in the raw profile spectrum. This yields a angstrom/pixel scale of 1.1418 and R=5747 @ the Ha value of 6563A. I know I would have gotten more accurate results using the French ISIS software, but I have a couple of weeks to get all my data to be compliant, not to mention a fairly step learning curve!
Unfortunately, I'm only able to use telluric line to calibrate this spectra region and maybe the adjacent spectral region ending slightly leftwards (shorter wavelength) of the H-Beta line; I shot 3x120sec2x2 binned exposures per the three spectral region spanning 3800-6950A, but I can only see the tellurics on two of the sets. Here is an extremely stretched version of the.Fit image file showing the identification of the telleric and stellar lines: http://www.astroimage.info/images/V5668%20Sgr-micro1205slit6-3x120sec2x2-09Nov15rTELLURIC.jpg
Identification of the OH and some other useful lines was made from this graphic from Christian Buil's website: http://www.astrosurf.com/buil/us/spe2/night_ir_sky.png
Hope to have my neon calibration lamp working before the next nova/supernova event!
James
Those are great spectra James - calibrations with telluric lines seem to have worked beautifully!
Best wishes - clear skies,
Stella
Thank you
Hello Jonathan,
Thank you for your reply - sounds great! On with measuring velocities?
Best wishes - clear skies,
Stella.
Yes indeed! There are a few amateur spectra of this nova knocking about, along with the good photometric coverage on AAVSO. Surely there's a publication or two in those data?
James,
I believe from Mark you have already arranged for a replacement neon.
Stella,
Many of us use external lamps as a reference source. The Neon and or RELCO lamps can be positioned in front of the objective and with care can give very good results.
For shorter wavelengths I use the FILLY lamp (now very difficult to source) which works very well.
The current Shelyak LhiresIII and the JTW Spectra-L200 spectrographs both provide either Neon or RELCO reference lamps built-in. A similar calibration module can also be fitted to the lo-res ALPY.
Ken
To: Ken,
RE:"The Neon and or RELCO lamps can be positioned in front of the objective and with care can give very good results."
I tried purchasing a RELCO lamp, but all vendors are in Europe and will not ship to the US only to the EU Union. Hope to get the Neon calibration set for the L-200 from Mark before 2016. The one I received was faulty.
James
Just search on
James,
Just search on "fluorescent starters" - The RELCO is popular in Europe but a local Philips etc may give you similar results.
http://www.ursusmajor.ch/downloads/sques-relco-sc480-calibration-lines-3.0.pdf
Hello!
When I'm doing precision RV work, I'll often try to use night sky spectrum to either create wavelength scale OR measure correction coefficients for specific lines. Unfortunately it's not always possible to see nice night sky emission lines - different atmospheric conditions translate to different sky background spectrum.
In the attachment, there is an identified night sky spectrum around hydrogen alpha region. Those marked lines give good dispersion curve (grating with 1200 l/mm) with dispersion 0.47 A/pix and RMS of fit of third order polynomial is 0.012 A. I'm considering that excellent.
Those lines on attached graph are typically not blends and therefore could be more or less safe to use with higher resolution. I think that because your spectrograph provides (much?) smaller dispersion, those lines you have used could be OK too (their deviations are too small compared to your dispersion). Just be careful not to use severe blends!
Best wishes,
Tõnis