WIYN Open Cluster Study. XXXVI. Spectroscopic Binary Orbits in NGC 188
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 Msun) 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 10^3 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 under-luminous 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).
Keywords
Cite
@article{arxiv.1512.04991,
title = {WIYN Open Cluster Study. XXXVI. Spectroscopic Binary Orbits in NGC 188},
author = {Aaron M. Geller and Robert D. Mathieu and Hugh C. Harris and Robert D. McClure},
journal= {arXiv preprint arXiv:1512.04991},
year = {2015}
}
Comments
31 pages, 5 (multi-panel) figures, published in AJ