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

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21541712p&link_type=abstract

American Astronomical Society, AAS Meeting #215, #417.12; Bulletin of the American Astronomical Society, Vol. 42, p.272

Astronomy and Astrophysics

Astronomy

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. We appreciate the support of the this research by the American Astronomical Society through the Small Research Grant program.

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