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Kepler data, sensor pos 41


Search for micro variables, object 2 and 3, Kepler data pos 41

Kepler data, sensor pos 41: Search for micro variation variable stars, object 2 and 3
Coordinates/Direction : RA: 290.427033o, DEC: +43.624771o. Angle calculator
Object size : sensor about 1 x 1 degrees
Object magnitude : -
Object : Area of Cygnus, Lyra and Draco
Date : 2009-08-19 to 2013-04-08
Lens/telescope : Kepler Space observatory
Film/CCD : Sensor position 41 (from sensor 41, 42, 43, 44), Kepler data, credits: STScI
Filter/Wavelength : 420 to 900 nm
Exp. time : 27 minutes x 44 frames
Image process tool : AstroImageJ, Fitswork, Irfanview
Processing : Multi aperture analyze
Site : Space
Comment : Here I with differential photometry looking for stars that just have small amounts of variation relative there neighbor stars. Just by random pick up sets of 8 stars and compare them against each other. After a while I found these two stars that have a different pattern compare to the other 6 stars that I use as reference stars.

I have not find out which stars these are yet.
Update:
With help from Thomas K and Hans Bengtsson I now know that the T1 star is ASAS J192437+4334.4 (KIC 7820467).
Hans Bengtsson also found that the star T5 is an earlier not known variable KIC 7888888, but needs follow up analyzes. See below.
More to know : T1 star ASAS J192437+4334.4 (KIC 7820467):
https://www.aavso.org/vsx/ index.php ...
http://simbad.u-strasbg.fr/ simbad ...
T5 star, 2MASS J19241840+4336434 (KIC 7888888):
http://vizier.u-strasbg.fr/ ...

Differential Photometry of variable star with micro variations

Kepler data, sensor pos 41: Search for micro variation variable stars, object 2 and 3
Image process tool : AstroImageJ, Irfanview
Processing : Multi aperture analyze
Site : Space
Comment : At bottom the 6 ref stars, they are offset along the Y-axis. Above, the yellow and blue line are the two stars that have a different pattern compare to the reference stars.

Update:
With a lot of help from Hans Bengtsson the T5 star (yellow line) is now reported as a new variable:
https://www.aavso.org/ vsx/ index.php? view=detail.top &oid=608444
More to know : Semi regular variable star, Wikipedia:
https://en.wikipedia.org/ wiki/ Semiregular variable star

One more analyze of T5 data, object 3, Kepler data pos 41

Kepler data, sensor pos 41: Search for micro variation variable stars, object 2 and 3
Coordinates/Direction : RA: 290.427033o, DEC: +43.624771o. Angle calculator
Object size : crop area about 0.2 x 0.2 degrees
Object magnitude : -
Object : Area of Cygnus, Lyra and Draco
Date : 2009-08-19 to 2013-04-08
Lens/telescope : Kepler Space observatory
Film/CCD : Sensor position 41 (from sensor 41, 42, 43, 44), Kepler data, credits: STScI
Filter/Wavelength : 420 to 900 nm
Exp. time : 27 minutes x 44 frames
Image process tool : AstroImageJ, Fitswork, Irfanview
Processing : Multi aperture analyze
Site : Space
Comment : Now when I gained more experience I have done the analyze of target T1 and T5 once again. More carefully selected reference stars and more of them. At the same time I got 6 more interesting stars to analyze.
Objects : T1, star ASAS J192437+4334.4 (KIC 7820467):
http://simbad.u-strasbg.fr/ simbad ...
https://www.aavso.org/vsx/ index.php ...
Period 82.6 d

T5, star, 2MASS J19241840+4336434 (KIC 7888888):
http://vizier.u-strasbg.fr/ ...
https://www.aavso.org/ ...
Period 42.1 d

T6, star, unknown by Simbad, 19:24:29.34 +43:37:30.1:
http://vizier.u-strasbg.fr ...

T7, star, unknown by Simbad, 19:24:36.54 +43:40:47.1:
http://vizier.u-strasbg.fr/ ...

T10, star, unknown by Simbad, 19:24:54.22 +43:32:52.8:
http://vizier.u-strasbg.fr/ ...

T11, KIC 7820062 -- Star:
http://simbad.u-strasbg.fr/ simbad ...

T16, KIC 7751017 -- Rotationally variable Star:
http://simbad.u-strasbg.fr/ simbad ...
https://www.aavso.org/ ...
Period 3.622 d

T18, star, unknown by Simbad, 19:24:32.30 +43:29:48.4:
http://vizier.u-strasbg.fr/ ...

Differential Photometry of variable star with micro variations

Kepler data, sensor pos 41: Search for micro variation variable stars, object 2 and 3
Image process tool : AstroImageJ, Irfanview
Processing : Multi aperture analyze
Site : Space
Comment : At top the T1 and T5 data, looks almost the same as earlier, good, because then I know it's not that very critical which reference star I use. Among the 20 stars I picked up I have 6 new candidates. I need to know at what brightness I shall limit my objects, they oversaturate at about 200'000 electrons / second. Too weak stars and it will be noise and also more difficult to get some data to compare with.

By looking at the error bars I see that object T7 has big error bars. Then looking at the signal of T7 I see that it has 40'000 electrons integrated in one second (the unit is electrons / second). I shall not use that weak stars as reference or maybe not as interesting object either. At least not now when I'm in the learning process.
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