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Title:
Searching for the ``MISSING'' PG Hot Subdwarfs in SDSS and Galex Data
Authors:
Wade, R. A.; Stark, M. A.; Green, R. F.; Durrell, P. R.
Affiliation:
AA(Department of Astronomy & Astrophysics, Pennsylvania State University, 525 Davey Lab., University Park, PA 16802, USA), AB(Department of Astronomy & Astrophysics, Pennsylvania State University, 525 Davey Lab., University Park, PA 16802, USA), AC(NOAO, P.O. Box 26732, Tucson, AZ 85726-6732, USA), AD(Department of Physics and Astronomy, Youngstown State University, Youngstown, OH 44555-2001, USA)
Publication:
Baltic Astronomy, Vol. 15, p. 81-84
Publication Date:
00/2006
Origin:
BALTA
Astronomy Keywords:
binaries: close, stars: horizontal-branch, ultraviolet: stars
Bibliographic Code:
2006BaltA..15...81W

Abstract

Many EHB stars have been found in short-period binaries, where the companions in these post-common envelope systems are either white dwarfs or dM stars; these systems are catalogued as hot subdwarfs because the sub\-dwarf is the more luminous component. Hypothetical Roche-lobe overflow systems (with more massive companions) may largely be uncatalogued, since the G band or Ca II K line from the companion may have caused them to be overlooked or discarded. In particular, many candidate objects were excluded from the PG catalog because of such spectroscopic indicators. Could these rejects include large numbers of ``missing'' hot subdwarfs? We have examined 2MASS, SDSS and GALEX archival data for large subsets of these rejected stars and conclude that only a handful (about 3 %) show indications of binarity; most are consistent with (single) metal-poor F stars, as was originally supposed.

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