Accurate radial velocities for carbon stars in the Sculptor dwarf spheroidal

Details Accurate radial velocities for carbon stars in the Sculptor dwarf spheroidal Accurate radial velocities for carbon stars in the Sculptor dwarf spheroidal

Sep 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987aj.....94..657a&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 94, Sept. 1987, p. 657-665.

Astronomy and Astrophysics

Astronomy

23

Carbon Stars, Dwarf Galaxies, Elliptical Galaxies, Mass To Light Ratios, Radial Velocity, Stellar Mass, Data Reduction, Giant Stars, K Stars, Milky Way Galaxy

Scientific paper

Velocities good to about + or - 1-2 km/s for seven of the eight known carbon stars in the Scupltor dwarf spheroidal galaxy are reported. The mean velocity for Sculptor, a quantity important for Galactic mass estimates, but having a controversial past history, is found to be 109.2 + or - 4.5 km/s, which agrees well with recent observations of K giants made by Armandroff and Da Costa (1986). The C star velocity dispersion is also in good agreement with the K giant results of the latter authors, after excluding one star that is a probable binary. It is argued that atmospheric motions are unlikely to influence dispersions derived from warmer-temperature, lower-luminosity carbon stars of the type measured here; duplicity effects are of far more serious concern. The Sculptor mass-to-light ratio derived is roughly double what is found for typical Galactic globulars, a difference that may arise either from the presence of dark matter, or from variation of the mass function. If the latter effect is important, it is suggested that low-mass stars, rather than remnants, are more plausible as the major contributors to the mass.

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