Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21542515h&link_type=abstract
American Astronomical Society, AAS Meeting #215, #425.15; Bulletin of the American Astronomical Society, Vol. 42, p.338
Astronomy and Astrophysics
Astronomy
Scientific paper
We present a deep photometric study of the central region of the Galactic globular cluster M15 from archival HST data taken on the High Resolution Channel and Solar Blind Channel of ACS. Our data set consists of images in FUV (F140LP), NUV (F220W), and B (F435W). The addition of an optical filter in our work complements previous work done on M15 in the UV by providing a constraint on the nature of the UV-bright stellar populations. Using color-magnitude diagrams (CMDs) constructed from photometry in these three filters we have identified several intriguing populations that arise from non-canonical stellar evolution including candidate blue stragglers, extreme horizontal branch stars, blue hook stars, cataclysmic variables, and helium-core white dwarfs. Furthermore, we have identified a class of UV-bright stars that lie between the blue horizontal branch and WD cooling sequences, a location not usually populated on cluster CMDs. These stars do not seem to belong to any of the standard UV-bright stellar populations and we explore several possibilities as to their nature, including the hypothesis that these stars may be very young low-mass helium-core white dwarfs. We also investigate an intriguing subset of cataclysmic variable candidates that appear in the gap between the MS and WDs in FUV-NUV but lie securely on the MS in NUV-B.
Anderson Jeffrey
Cohn Haldan N.
Cool Adrienne
Haurberg Nathalie
Lubell M. G. G.
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