Testing a New Method of Detecting RR Lyrae Variable Stars

Details Testing a New Method of Detecting RR Lyrae Variable Stars Testing a New Method of Detecting RR Lyrae Variable Stars

Oct 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aps..tsf.d1006p&link_type=abstract

American Physical Society, Joint Fall 2009 Meeting of the Texas Sections of the APS, AAPT, and SPS Postdeadline, October 22-24,

Physics

Scientific paper

We have submitted for publication a new method of selecting candidate RR Lyrae stars using out-of-phase single epoch photometric and spectroscopic observations contained in SDSS Data Release 6 (DR6). The technique detects variability by exploiting the large disparity between the (g - r) color and the strength of the Hydrogen Balmer lines when the two observations are made at random phase. The SDSS Stripe 82 allowed us to show that our method has a discovery efficiency of ˜85%. This technique has yielded over 1,000 candidates fainter than g = 14.5. We present the results of observations of several of these candidates made on the 0.8m telescope at McDonald Observatory, with 10 of 11 confirmed as variable and one labeled as a likely RRc. We also examine the use of clumping in the suspected variables to probe galactic structure, both known and new.

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