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Title:
WIYN Open Cluster Study. XXXVI. Spectroscopic Binary Orbits in NGC 188
Authors:
Geller, Aaron M.; Mathieu, Robert D.; Harris, Hugh C.; McClure, Robert D.
Affiliation:
AA(Department of Astronomy, University of Wisconsin - Madison, WI 53706, USA ; Visiting Astronomer, Kitt Peak National Observatory, National Optical Astronomy Observatory, which is operated by the Association of Universities for Research in Astronomy (AURA) under cooperative agreement with the National Science Foundation.), AB(Department of Astronomy, University of Wisconsin - Madison, WI 53706, USA ; Visiting Astronomer, Kitt Peak National Observatory, National Optical Astronomy Observatory, which is operated by the Association of Universities for Research in Astronomy (AURA) under cooperative agreement with the National Science Foundation.), AC(United States Naval Observatory, Flagstaff, AZ, 86001, USA ), AD(Dominion Astrophysical Observatory - Herzberg Institute of Astrophysics - National Research Council, 5071 W. Saanich Road, Victoria, BC V9E 2E7, Canada )
Publication:
The Astronomical Journal, Volume 137, Issue 4, pp. 3743-3760 (2009). (AJ Homepage)
Publication Date:
04/2009
Origin:
IOP
AJ Keywords:
open clusters and associations: individual: NGC 188, binaries: spectroscopic, blue stragglers
DOI:
10.1088/0004-6256/137/4/3743
Bibliographic Code:
2009AJ....137.3743G

Abstract

We present 98 spectroscopic binary orbits resulting from our ongoing radial velocity survey of the old (7 Gyr) open cluster NGC 188. All but 13 are high-probability cluster members based on both radial velocity and proper motion membership analyses. Fifteen of these member binaries are double lined. Our stellar sample spans a magnitude range of 10.8 <=V<= 16.5 (1.14-0.92 M sun) and extends spatially to 17 pc (~13 core radii). All of our binary orbits have periods ranging from a few days to on the order of 103 days, and thus are hard binaries that dynamically power the cluster. For each binary, we present the orbital solutions and place constraints on the component masses. Additionally, we discuss a few binaries of note from our sample, identifying a likely blue straggler-blue straggler binary system (7782), a double-lined binary with a secondary star which is underluminous for its mass (5080), two potential eclipsing binaries (4705 and 5762), and two binaries which are likely members of a quadruple system (5015a and 5015b).
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