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Title: Screenshot AAVSO VPhot showing all the identified variables
Description:
This is the starfield in throught the Luminance filter in AAVSO's online tool VPhot for photometric analysis.
All the green tags are known to be variable stars that VPhot recognizes. There are even more but those were over saturated or too faint to get good sinal to noise ratio on. So there are loads of them within the Pleiades cluster. I will make a final image with the inset of the 4 variables I was able to recognize real variability in one night
Uploaded: ...
Title: Pleiades cluster + 4 variable stars
Description:
There are lots of variablle stars in this cluster. 4 of them showed their variablility during my recordings.
NSV 1300. which is of type BY Draconis variables. These are rotating variables, usually type K or M, so orange/red stars. What you see here are starspots (sunspots on a star) spinning in and out of the frame. It runs in 4.5 hours and you see almost 2 laps.
V1188, which is an eclipsing binary star with a period of 13.88 hours orbits. It varies between 12.3 and 11.85.
According to AAVSO, the spectrum class, or the star color of V1188, is uncertain but for now set to A0. If it is A0 then the B-V index should be 0. (B,magnitude - V,magnitude). If my measurements are correct, it's more like 0.5. Which would correspond to type F7 or F8. Pretty nice this, really measuring things 😊. Later I will take another spectrum of the star with my StarAnalyzer to check whether it is really an F class star.
YZ Tau also shows variability. This is an RR Lyrae type variable. with a period of 9 hours. These are pulsating stars that shrink and grow periodically.
Here you can already see a contraction (getting hotter) and expansion (getting colder) of the star.
OU Tau is also a BY type star, a rotating star with a stellar spot on it. It rotates in 9.5 hours. In this case you can already see 1 cautious dip when the starspot rotates in and out of our image
Uploaded: ...
Title: Pleiades cluster, enhanced contrast
Description:
I enhanced the contrast as I found the first version a bit flat in hindsight.
- curves stretch
- local contrast enhancement with DarkStucture Enhancement in PixInsight
Uploaded: ...
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