Affiliation
None
Mon, 08/26/2019 - 07:14
Dear friends,today saw a flash of stars near M31 ,blink between frames 3 hours made up ,what do you say about this star?There is a video but here it will not show;((
File Upload
Lower right corner,blink 3 hours between efficiencies
This star does show more difference between "Before" and "After" images than other stars in the images, but a detection on a single image is not convincing. You may wish to continue observing this field. To make the case for variability, it would be good to have mulitple images showing the star both bright and faint, and compare that variation to the variability of other stars (of similar brightness) across all the images.
There are a lot of possible variables at play: changes in sky conditions, differences between quality of tracking in the two images, variations in film emulsion ("plate defects"), the sampling in the scanning process, etc. (Am I right, that these are film images that have been scanned?)
You also may wish to check databases such as ASAS-SN or NSVS / ROTSE to see if they have any photometry on the object. And with those datasets, compare the variability of this star to that of nearby stars of similar brightness and colour.
I hope this helps a bit,
Gary Billings
Using a planetarium program, I identify the star as GSC 2788-1905. When I enter that star's coordinates in to the ASAS-SN "retrieval by coordinates" page,
https://asas-sn.osu.edu
it comes up as a 1.73 d period eclipsing binary.
This link will take you to the page showing a light curve derived by ASAS-SN
https://asas-sn.osu.edu/variables/AP2680708
So, "Well Done" re identifying a variable in your images! In this case, it is a "known variable".
Gary Billings
Hi Gary et al,
This variable was discovered in 2012 by László Németh and Róbert Fidrich and it is in VSX as Vend44.
Remember to check VSX when you look for variables. We may have better information. And there are external links to the ASAS-SN variables that will take you to the survey data with just one click.
Cheers,
Sebastian
Sebastian, thanks for the reminder that VSX can be searched by coordinates!
Thank you friends, I do not know what I would do without you!!! Will continue to watch,sorry dispelled my dreams of a new star:)))) but I'm still in search of a new will for a long time...
Today will take its new and will show you a blink with perehodom 3-4 maybe 5 hours,it is strange why she was so periodom 1.73 d suddenly puffed for 3 hours last?