Planet Hunters forum Talk member Mike Barrett (mjtbarrett) posted an interesting LC for KIC 10988583 that has a phased curve indicative of a RRL type C. With forum Talk members assistance, the actual RRL type C was narrowed down in the Kepler field of view to star KIC 10988601.
Kian Jek's comments:
You can read more about this star on the Planet Hunters forum Talk thread here.
The phased curve certainly does have RRc characteristics but the amplitude is off. An inspection of the entire light curve tells us straight away that this is contaminated flux:
But where is it coming from? Looking at the Q6 TPF, it is clear that the contamination is in the halo pixels vertically below the target pixels.
There are in-phase APOs as well:
To cut a long story short, here's the phased curve from that one halo pixel in Q6, col 102 row 899, normalized and it now does match the amplitude and period of a typical RRc variable:
From the TPF, and the APO vector, it appears that the contaminating RRc is KIC 10988601, #2 in the Skyview image:
Even though 601 is more than 10 arcseconds away from the target, after re-orientation, it is directly below and one pixel to the left of the target. It is very likely there is a charge bleed along the column indicated since it is brighter than the target, causing it to contaminate that halo pixel. A quick check of the MAST parameters for KIC 10988601 tells us that it has a Teff of 7169K (F0/A9) and an estimated stellar radius of 2.287, almost exactly what we need for an RRc pulsator.
No comments:
Post a Comment
Note: Only a member of this blog may post a comment.