Other
Scientific paper
Feb 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984pasp...96..128s&link_type=abstract
Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 96, Feb. 1984, p. 128-142.
Other
41
Astronomical Catalogs, Dwarf Galaxies, Giant Stars, Stellar Spectra, Blue Stars, Globular Clusters, K Stars, Line Spectra, Metallic Stars, Radial Velocity, Red Giant Stars
Scientific paper
Giant stars in Draco reveal a wide range of metal abundance as measured by the strengths of Ca II H and K. These range from abundances intermediate between M3 and M92 to abundances much more metal-poor than M92. Draco is found to contain some stars that are much cooler than the giant-branch tip in M92 while being much more metal-poor than stars in M3. On the average, Draco and Ursa Minor giants reveal a systematic enhancement of the G band of CH relative to globular-cluster stars of comparable metallicities and temperatures; some individual stars, however, show G bands appropriate to their metallicities. The systemic radial velocities of Draco and Ursa Minor are determined to be near -296 and -255 km/s, respectively. One star in the Draco field is determined to be a nonmember. All the other stars observed in the Draco field, among them a UV-bright K giant and a blue suprahorizontal-branch star, together with all the stars observed in Ursa Minor, have velocities consistent with membership. The new radial velocities furnish weak evidence against an internal velocity dispersion as great as 10 km/s in Draco.
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