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- W2019181350 abstract "view Abstract Citations (82) References (19) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The Star Cluster NGC 6791. Kinman, T. D. Abstract A B V color-magnitude diagram of NGC 6791 for 13 < V < 20 is similar to that of the well-evolved cluster NGC 188. Intrinsic colors are derived from the classification of sixteen spectra of cluster stars and gave = 0 22 I 0.02 mag. Implicit in this value is a correction which assumes equal line blanketing in the cluster stars and the MK standards used. No line weakening was observed in the cluster spectra, but the smaller color range in the quasi-horizontal part of the subgiant sequence at +3 <M < +4 may indicate a slight metal/hydrogen deficiency in NGC 6791 with respect to NGC 188. The true modulus of NGC 6791 is m - M = 13.55 corresponding to a height of 1 kpc above the galactic plane at a distance of 5.1 kpc. The estimated mass is 3700 Mo and the integrated M = -54. The relative frequencies of stars in the cluster sequences are given after correction for field stars. A sequence of blue subgiants is identified in the cluster and membership is verified from radial velocities; no satisfactory explanation of the evolutionary state of these stars was found A concentration of stars in the red-giant branch at M = +0.5 with an incipient blueward extension probably indicates the presence of cluster stars in a post-red-giant stage of evolution. The calculated integrated spectral type of this cluster is about G4; its radial velocity is - 68 km/sec. Classification by low-dispersion spectra alone may therefore lead to some confusion between this type of cluster and disk-globular clusters of the latest spectral type. The estimated departure of the radial velocity component of NGC 6791 from that expected from galactic rotation is -95 km/sec compared with - 26 km/sec for NGC 188 This, taken with its greater height above the galactic plane, suggests that NGC 6791 has a galactic orbit that is intermediate between NGC 188 and the globular clusters. Publication: The Astrophysical Journal Pub Date: August 1965 DOI: 10.1086/148329 Bibcode: 1965ApJ...142..655K full text sources ADS | data products SIMBAD (43) GCPD (1)" @default.
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- W2019181350 title "The Star Cluster NGC 6791." @default.
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