BSM Legacy Targets for Adoption

I'll put in one for FY Lib I have been thinking about a proposal involving SRB variables and possible differences in V versus Ic photometry. This would give me a chance to investigate a bright SRB.

R EA/GS+SRD. Question: Arer those data time series data so that minimums in several bands can be studied. If so, I would also be interested in that one.

Ed

I am preparing the proposal now, Mike. Can you tell me a bit about BL Tel. I mangled the first message relative to that target. If time series data are avaialble for that target I do minima and since it it also SRD the minima in Ic versus other filter bands would be interesting.

I would need to know a lot more about BL Tel. Glad to process those data, but I am not sure what a proposal would look like in terms of the science goal. I'll do a little research, but let me know if you have a volunteer.

Re FY Lib: can you tell me a bit about the epoch range of the data collected, if those data continue to be collected, and the photometric bands? If BVI or BVRI, then I have what might be an interesting science goal.

Ed

Hi Ed,

When I started the BSM network, I was thinking of where they could scientifically contribute.  One regime was obviously any bright star, as most were not being monitored by the professionals and yet contained many of the prototypes for variability classes (like delta Cepheii).  Another was long-term monitoring, whether nightly on a 100d period star or decades on things like eps Aur.

What logically fit into this latter class were long-period eclipsing systems, say periods longer than a year or so.  Then the eclipses were multi-day, so robotic imaging once/night would cover the eclipse, and the change was slow enough that you could also get color information.  While many of these systems had been studied during their eclipses (like VV Cep), the interval between eclipses was ignored, and the BSM systems could monitor there as well as the eclipses.

BL Tel was one of these that was put in the queue.  It has a 778d eclipsing period, but one of the stars is also a 92d semiregular variable, so long-term monitoring gave information on both variations.  It has been on the BSM queue for about 8 years, with 100-150 datasets per year.

FY Lib is an SRB with 180d period that has been monitored in BVRI for about 5 years.  it was a target suggested by John Toone in 2014, who had been following it for 15 years and had seen it brighter than ever before and wanted an electronic measurement.  I just left it in the queue after that to see whether that brightening was a fluke.

Most of the AAVSO_Monitoring targets are done in BVRI, and typically once per night over multiple years.  Sometimes they were originally chosen for an Alert campaign coverage, and left on to see what happens after such a campaign ended.  Sometimes a researcher requested information like BVRI magnitudes for comp stars of an interesting object.  There were a half-dozen targets in the south, another half-dozen in the north, and a bunch of targets in the SRO queue (some of which now have 10 years of data!) that are well-covered, but which have not been "adopted".

Arne

Hello! I do not have any experience with VPHOT. I plan to take the VPHOT Choice course in the future.

    For now, would I be able to access the images and transforms and use the software I have experience with (MPO Canopus) for this project? Thank you and best regards.

Mike

Arnie:

Thanks for the extra information, I'll also volunteer for BL Tel. Lately I have been measuring EAs and EWs, one run every clear night, so I have plenty of time to work on other projects. The FY Lib proposal is just about ready to send in. I will prepare the BL Tel proposal today and get it submitted. Given that it is both an EA and a SRB with an M-class star, it should be interesting.

Ed

Arne,

I checked the existing data and light curve for BL Tel. It appears that three complete and transformed eclipses have already been placed in the AAVSO data base with observations between the eclipses. In addition there is one more transformed BV eclipse and lots of earlier vis observations. I assume that all CCD data have been collected and transformed for this system and that the proposal should be directed towards analyzing those existing data. and processing any subsequent data.

Among the possible science goals might be (1) refining the period, (2) checking for light and color changes during eclipses due to the SRD influence (van Genderen, 1983) and following up on the double pulsator hypothesis (Zsoldos, 1994). (Complete references are in VSX.)

Ed

OK, I will confess my ignorance: What is a "high-latitude eclipsing system?"  The term seems to be common, but I could not find a definition. 

Ed

Hi Mike,

  I will volunteer to do R Sct.

  I have been talking to Arne off line about it and it sounds like something I would like to do.

  I will get a proposal in right away.

Clear skies,

Dennis Means MSD

I'll prepare a proposal for BL Tel if not taken. I need to consult with Arne, if he has time, before submission. This is an interesting one.

Ed

If no one has spoken up for U Mon yet I'll adopt it - I don't want it to feel left out. The light curve is interesting, and it's a close post-AGB star at only a 1000 parsecs according to Gaia (how spoiled we've become, thanks to that mission!) so it's a good target for studying this class.

Shawn 

Here are the targets from the northern BSMs.  All are done with BVRI filters unless stated.

EE_Cep

This long-period eclipsing system (2050d period) had an eclipse 2014/08/21 and an upcoming eclipse on 2020/03/31.  It has been on the monitoring program for the northern BSMs, and also for the W30/coker30 system that was at Bill Goff's observatory.  Any secondary eclipse should be covered by this extensive monitoring program.

EU_Del

Alert Notice 441, 2011/05/27, presented a campaign to cover multiple bright giant variable stars of diverse classes.  EU Del was put on the BSM program on 2012/12/16 and has been covered ever since.  SRB, 58d period.

GO_Cnc

Chris Lloyd emailed on 2014/07/19 about this eclipsing system, with a 40yr apsidal motion period.  We've now covered 5 years of the orbital motion, and may have enough data to give some clues.

R_CrB

I got interested in this prototypical star early on, and put it on the BSM queue in 2012 waiting for its return to full brightness.

RR_Lyr

Here is another prototypical star, the brightest member of its class.  It was found with high precision photometry to be a Blazhko effect star, though I doubt the BSM precision is adequate.  Observations are one/night, so you can build up a light curve for each season, but the cadence is way too long for a nightly light curve.

There are a bunch more stars on the SRO monitoring queue that I'll post in a few days, and several others where the researcher has not submitted observations to the AID.

Arne

May I assume that the legacy FY Lib images will appear in my VPhot account? Nothing has shown up yet. I know that the new BL Tel data will only become available later this year as the target appears. 

Ed