A Search for Binary Hot Subdwarfs. II. Infrared Photometry of Palomar-Green Survey sdO Stars

Details A Search for Binary Hot Subdwarfs. II. Infrared Photometry of Palomar-Green Survey sdO Stars A Search for Binary Hot Subdwarfs. II. Infrared Photometry of Palomar-Green Survey sdO Stars

Aug 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001pasp..113..944w&link_type=abstract

The Publications of the Astronomical Society of the Pacific, Volume 113, Issue 786, pp. 944-953.

Astronomy and Astrophysics

Astronomy

11

Stars: Binaries: General, Stars: Fundamental Parameters, Stars: Horizontal-Branch

Scientific paper

Eight sdO binary candidates have been identified through IR photometry of 25 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 optically 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.

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