Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989pasp..101.1105f&link_type=abstract
Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 101, Dec. 1989, p. 1105-1112.
Astronomy and Astrophysics
Astronomy
42
Astronomical Spectroscopy, Milky Way Galaxy, Open Clusters, Radial Velocity, Red Giant Stars, Charge Coupled Devices, Galactic Rotation, Metallicity
Scientific paper
Moderate-resolution CCD spectra in the Mg b region of red giants in 13 old or metal-poor open clusters were obtained with the kitt Peak 2.1-m telescope. Radial velocities for these giants, measured by cross-correlation techniques, are accurate to 10 km/s. For the six clusters in the sample with previous measurements, the velocities are in good agreement with published values. Results are presented for seven clusters (NGC 1193, NGC 1817, NGC 6819, NGC 7142, Be 21, King 8, IC 166) with no previous radial-velocity measurements. The majority of clusters in the sample, supplemented with ten more clusters older than 1 Gyr which have published velocities, show radial velocities which are consistent with those expected from the reflex of solar motion and simple galactic rotation. A few of the clusters, including the newly measured NGC 1193 and NGC 1817, show surprisingly large radial velocities, indicating significant deviation from the general rotation of the remaining old cluster system.
Friel Eileen D.
Janes Kenneth A.
Liu Tianxing
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