Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21715218c&link_type=abstract
American Astronomical Society, AAS Meeting #217, #152.18; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
Using the image subtraction method of Alard & Lupton (1998) we have searched for variable stars in the globular cluster M14 (NGC 6402). Image frames were obtained during June and July 2010 using two different telescopes, the Southeastern Association for Research in Astronomy (SARA) 0.9 meter at Kitt Peak National Observatory and the SARA 0.6 meter located at Cerro Tololo Interamerican Observatory. We confirmed 62 previously known variables catalogued by Wehlau & Froelich (1994). In addition to the previously known variables, we have identified 71 new variables. We have confirmed the periods of most of Wehlau & Froelich's variables we identified with just a few exceptions. Of the total number of confirmed variables, we found a total of 112 RR Lyrae stars, several of which exhibited the Blazhko Effect. Of the total we classified 55 RR0, 57 RR1, 19 variables with periods greater than 2 days, a W UMa contact binary, and an SX Phe star. We present the periods of previously found variables as well as the periods, classification, and light curves of the newly discovered variables. This project was funded in part by the National Science Foundation Research Experiences for Undergraduates (REU) program through grant NSF AST-1004872 and by a grant from the Butler Institute for Research and Scholarship.
Conroy Kyle E.
Darragh Andrew N.
Liu Jefferson Zhe
Murphy Brian William
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