A search for binary hot subdwarfs. II. Infrared photometry of Palomar-Green Survey sdO stars

Authors
Williams, T McGraw, JT Mason, PA Grashuis, R
Citation
T. Williams et al., A search for binary hot subdwarfs. II. Infrared photometry of Palomar-Green Survey sdO stars, PUB AST S P, 113(786), 2001, pp. 944-953
Citations number
51
Categorie Soggetti
Space Sciences
Journal title
PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC
ISSN journal
00046280 → ACNP
Volume
113
Issue
786
Year of publication
2001
Pages
944 - 953
Database
ISI
SICI code
0004-6280(200108)113:786<944:ASFBHS>2.0.ZU;2-C
Abstract
Eight sdO binary candidates have been identified through IR photometry of 2 5 type O hot subdwarfs. Five of the eight binary candidates are identified for the first time. These new binary candidates complement a list of nine o ptically identified sdO binary candidates discovered in an earlier portion of this project. The new candidates are identified on the basis of IR color excesses in two-color plots of extinction-corrected data. We estimate that at least 64% of the Palomar-Green Survey sdOC hot subdwarfs are binary.