Accession Number : ADA497440


Title :   WIYN Open Cluster Study. XXXVI. Spectroscopic Binary Orbits in NGC 188


Descriptive Note : Journal article


Corporate Author : WISCONSIN UNIV-MADISON DEPT OF ASTRONOMY


Personal Author(s) : Geller, Aaron M ; Mathieu, Robert D ; Haris, Huch C ; McClure, Robert D


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a497440.pdf


Report Date : Apr 2009


Pagination or Media Count : 19


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 less or equal V less or equal 16.5 (1.14-0.92 solar mass) and extends spatially to 17 pc (approximately 13 core radii). All of our binary orbits have periods ranging from a few days to on the order of 10(exponent 3) 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).


Descriptors :   *ORBITS , *BINARY STARS , STELLAR EVOLUTION , RADIAL VELOCITY , REPRINTS , SPECTROSCOPY


Subject Categories : Astrophysics
      Celestial Mechanics


Distribution Statement : APPROVED FOR PUBLIC RELEASE