Radial velocities of carbon stars in three dwarf spheroidal galaxies

Details Radial velocities of carbon stars in three dwarf spheroidal galaxies Radial velocities of carbon stars in three dwarf spheroidal galaxies

Sep 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985aj.....90.1796s&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 90, Sept. 1985, p. 1796-1800.

Astronomy and Astrophysics

Astronomy

35

Carbon Stars, Dwarf Galaxies, Mass To Light Ratios, Radial Velocity, Stellar Motions, Error Analysis

Scientific paper

Accurate radial velocities have been obtained for carbon stars in three southern dwarf spheroidal galaxies: six stars in Carina, three stars in Sculptor, and five stars in Fornax. To within the errors, the observed rms velocity dispersion for all three galaxies is the same: ≡6 km s-1. The derived M/L for these galaxies is then 9.7 for Carina, 0.5 for Fornax, and 3.4 for Sculptor. This suggests that either there is a spread in the mass-to-light ratio for these systems by a factor of almost 20, or that the observed radial velocity of a carbon star is not a good measure of its center-of-mass velocity.

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