A Study on the Fundamental Characteristics of Open Cluster NGC 6791 Based on SDSS-DR8 and 2MASS Data

Details A Study on the Fundamental Characteristics of Open Cluster NGC 6791 Based on SDSS-DR8 and 2MASS Data A Study on the Fundamental Characteristics of Open Cluster NGC 6791 Based on SDSS-DR8 and 2MASS Data

Jul 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011acasn..52..265g&link_type=abstract

Acta Astronomica Sinica, vol. 52, no. 4, p. 265-274

Mathematics

Probability

Open Clusters And Associations: Individual: Ngc 6791, Stars: Abundances, Stars: Distances, Techniques: Radial Velocities

Scientific paper

SDSS-DR8 (The Eighth Data Release of Sloan Digital Sky Survey) and 2MASS (Two Micro All Sky Survey) data are used to analyze the fundamental parameters of the open cluster NGC 6791. Using the radial velocities of 274 stars in the region of the cluster, we calculate the membership probability for each star with the maximum likelihood method. Based on the stars with high membership probabilities, we derive a mean radial velocity value V_{r}=-46.4±0.2 km\cdots^{-1} and a mean metallicity value [Fe/H] =0.32±0.11 dex. Using red clump giants in the cluster as a kind of excellent distance indicator, we derive an absolute distance modulus value (m-M)_{0}=13.02±0.08 mag or distance 4.02±0.15 kpc. We therefore confirm that NGC 6791 is extremely metal-rich, and within the resolution of SDSS spectra, NGC 6791 does not show any evidence of internal spread in metallicity. The radial velocity and metallicity obtained by us are in good agreement with the values reported by other authors based on high-resolution spectra. Our derived absolute distance modulus based on red clump giants is also consistent with the values obtained from main sequence fittings by some authors.

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