WIYN Open Cluster Study. LX. Spectroscopic Binary Orbits in NGC 6819

Type Journal Article
Names Katelyn E. Milliman, Robert D. Mathieu, Aaron M. Geller, Natalie M. Gosnell, Søren Meibom, Imants Platais
Publication The Astronomical Journal
Volume 148
Issue 2
Pages 38
Journal Abbreviation The Astronomical Journal
Date August 1, 2014
DOI 10.1088/0004-6256/148/2/38
ISSN 0004-6256
URL http://adsabs.org/2014AJ.148.38M
Library Catalog adslabs.org
Abstract We present the current state of the WOCS radial-velocity (RV) survey for the rich open cluster NGC 6819 (2.5 Gyr) including 93 spectroscopic binary orbits with periods ranging from 1.5 to 8000 days. These results are the product of our ongoing RV survey of NGC 6819 using the Hydra Multi-Object Spectrograph on the WIYN 3.5 m telescope. We also include a detailed analysis of multiple prior sets of optical photometry for NGC 6819. Within a 1° field of view, our stellar sample includes the giant branch, the red clump, and blue straggler candidates, and extends to almost 2 mag below the main sequence (MS) turnoff. For each star observed in our survey we present all RV measurements, the average RV, and velocity variability information. Additionally, we discuss notable binaries from our sample, including eclipsing binaries (WOCS 23009, WOCS 24009, and WOCS 40007), stars noted in Kepler asteroseismology studies (WOCS 4008, WOCS 7009, and WOCS 8007), and potential descendants of past blue stragglers (WOCS 1006 and WOCS 6002). We find the incompleteness-corrected binary fraction for all MS binaries with periods less than 104 days to be 22% ± 3% and a tidal circularization period of 6.2^{+1.1}_{-1.1} days for NGC 6819.
Tags BINARIES: SPECTROSCOPIC, blue stragglers, open clusters and associations: individual: NGC 6819
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