SIMBAD references

2014AJ....148...61T - Astron. J., 148, 61 (2014/October-0)

WIYN open cluster study. LIX. Radial velocity membership of the evolved population of the old open cluster NGC 6791.


Abstract (from CDS):

The open cluster NGC 6791 has been the focus of much recent study due to its intriguing combination of old age and high metallicity (∼8 Gyr, [Fe/H] = +0.30), as well as its location within the Kepler field. As part of the WIYN Open Cluster Study, we present precise (σ = 0.38 km/s) radial velocities for proper motion candidate members of NGC 6791 from Platais et al. Our survey, extending down to g' ∼ 16.8, is comprised of the evolved cluster population, including blue stragglers, giants, and horizontal branch stars. Of the 280 proper-motion-selected stars above our magnitude limit, 93% have at least one radial velocity measurement and 79% have three measurements over the course of at least 200 days, sufficient for secure radial-velocity-determined membership of non-velocity-variable stars. The Platais et al. proper motion catalog includes 12 anomalous horizontal branch candidates blueward of the red clump, of which we find only 4 to be cluster members. Three fall slightly blueward of the red clump and the fourth is consistent with being a blue straggler. The cleaned color-magnitude diagram shows a richly populated red giant branch and a blue straggler population. Half of the blue stragglers are in binaries. From our radial velocity measurement distribution, we find the cluster's radial velocity dispersion to be σc= 0.62±0.10 km/s. This corresponds to a dynamical mass of ∼4600 M.

Abstract Copyright:

Journal keyword(s): blue stragglers - open clusters and associations: individual: NGC 6791

VizieR on-line data: <Available at CDS (J/AJ/148/61): table1.dat table2.dat table4.dat>

Nomenclature: Tables 1-2, 4-5, col(IDW): [TGM2014] NNNNNN N=280 among (Nos 1002-102050).

Simbad objects: 288

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