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Title:
A Hidden Population of Hot Subdwarf Stars in Close Binaries
Authors:
Wade, Richard A.; Clausen, Drew R.; Kopparapu, Ravi Kumar; O'Shaughnessy, Richard; Stark, M. A.; Walentosky, M. J.
Affiliation:
AA(Department of Astronomy & Astrophysics, Pennsylvania State University, 525 Davey Lab, University Park, PA 18602, USA), AB(Department of Astronomy & Astrophysics, Pennsylvania State University, 525 Davey Lab, University Park, PA 18602, USA), AC(Department of Physics, Pennsylvania State University, 104 Davey Lab, University Park, PA 16802, USA; Department of Geosciences, Pennsylvania State University, 443 Deike Building, University Park, PA 16802), AD(Center for Gravitational Wave Physics, Department of Physics, Pennsylvania State University, 334 Whitmore Lab, University Park, PA 16802-6300, USA; Center for Gravitation and Cosmology, University of Wisconsin-Milwaukee, Milwaukee, WI 53211, USA), AE(Department of Astronomy & Astrophysics, Pennsylvania State University, 525 Davey Lab, University Park, PA 18602, USA; Department of Computer Science, Engineering, & Physics, University of Michigan-Flint, 213 Murchie Science Building, 303 Kearsley Street, Flint, MI 48502 USA), AF(Department of Astronomy & Astrophysics, Pennsylvania State University, 525 Davey Lab, University Park, PA 18602, USA; Department of Physics, Clarion University of Pennsylvania, 189 Science and Technology Center, 840 Wood Street, Clarion, PA)
Publication:
INTERNATIONAL CONFERENCE ON BINARIES: In celebration of Ron Webbink's 65th Birthday. AIP Conference Proceedings, Volume 1314, pp. 73-78 (2010). (AIPC Homepage)
Publication Date:
12/2010
Origin:
AIP
Keywords:
dwarf stars, galaxies, brightness, spectroscopy
PACS Keywords:
Giant and subgiant stars, Spiral arms and galactic disk, Magnitudes and colors, luminosities, Spectroscopy and spectrophotometry
Abstract Copyright:
(c) 2010: American Institute of Physics
DOI:
10.1063/1.3536419
Bibliographic Code:
2010AIPC.1314...73W

Abstract

Observations to date preferentially find Galactic hot subdwarf (sdB/sdO) stars in binaries when the subdwarfs are more luminous than their relatively faint companions (G/K/M dwarfs, white dwarfs). As suggested by Han et al. [1], this selection bias may distort our perspective of the evolutionary channels that form hot subdwarfs in the galactic disk. A predicted and possibly more numerous population of binaries features a lower-mass, lower-luminosity, longer-lived hot subdwarf hiding in the glare from its companion: the subdwarf+A/early F binaries. Such systems may arise when mass transfer is initiated in the Hertzsprung gap; the A/F companion in some cases was ``created'' from a lower-mass star (i.e., it would be a blue straggler if seen in a cluster).

A survey is underway at Penn State to identify hot subdwarfs paired with F stars, determine their properties, and establish their space density. The project makes use of ground and space archival data to identify these systems (from their UV excesses) and new spectroscopic observations to determine their orbital periods and other properties. Successful characterization of this group of close binaries should help to challenge, calibrate, or refine models of binary star evolution that are used in population synthesis studies, including the relative importance of the RLOF and common-envelope channels for the formation of hot subdwarfs. The motivation, methodology, and status of this search for hidden hot subdwarfs are presented in this contribution.

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