The kinematics and chemical abundance of the remote globular cluster AM-1

Details The kinematics and chemical abundance of the remote globular cluster AM-1 The kinematics and chemical abundance of the remote globular cluster AM-1

Aug 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985aj.....90.1481s&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 90, Aug. 1985, p. 1481-1485. Research supported by the Dominion Astrophysical Observ

Astronomy and Astrophysics

Astrophysics

21

Giant Stars, Globular Clusters, Metallicity, Milky Way Galaxy, Radial Velocity, Stellar Spectra, Stellar Systems, Abundance, Horizontal Branch Stars, Line Spectra, Mass Distribution, Spectral Line Width

Scientific paper

Spectroscopic observations of two giants in the most distant known Galactic globular cluster, AM-1, have been obtained with the photon-counting intensified reticon spectrometer on the 2.5-m du Pont telescope of the Las Campanas Observatory. The metallicity of AM-1, based on the calcium II H + K line strengths, is found to be forbidden Fe/H = - 1.7 + or - 0.2, in agreement with the determinations based on the color of the intersection of the horizontal branch with the giant branch. This abundance supports previous studies which find a zero gradient in forbidden Fe/H in the outer Galactic halo. The observed heliocentric velocity for AM-1, + 116 km/s, implies a Galactocentric radial velocity of -41 km/s. Such a low velocity supports the contention of Lynden-Bell et al. (1983) that the velocities of the outer halo stellar systems do not provide evidence for a very massive galaxy of less than a few x 10 to the 12th solar mass.

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