WIYN open cluster study. LX. Spectroscopic binary orbits in NGC 6819

Katelyn E. Milliman, Robert D. Mathieu, Aaron M. Geller, Natalie M. Gosnell, Søren Meibom, Imants Platais

Research output: Contribution to journalArticlepeer-review

60 Scopus citations


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.

Original languageEnglish (US)
Article number38
JournalAstronomical Journal
Issue number2
StatePublished - Aug 2014


  • binaries: spectroscopic
  • blue stragglers
  • open clusters and associations: individual (NGC 6819)

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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