Accurate radial velocities for carbon stars in Draco and Ursa Minor - The first hint of a dwarf spheroidal mass-to-light ratio

Details Accurate radial velocities for carbon stars in Draco and Ursa Minor - The first hint of a dwarf spheroidal mass-to-light ratio Accurate radial velocities for carbon stars in Draco and Ursa Minor - The first hint of a dwarf spheroidal mass-to-light ratio

Mar 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...266l..11a&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 266, Mar. 1, 1983, p. L11-L15.

Astronomy and Astrophysics

Astrophysics

182

Carbon Stars, Dwarf Galaxies, Neutrinos, Radial Velocity, Halos, Mass To Light Ratios, Milky Way Galaxy, Missing Mass (Astrophysics), Spheroids, Velocity Measurement

Scientific paper

Velocities accurate to about 1 km/s have been obtained with the Multiple Mirror Telescope and echelle spectrograph for three carbon stars in the Draco dwarf galaxy and one carbon star in the Ursa Minor dwarf. These observations demonstrate that measurement of radial velocities having such high precision is quite feasible for stars as faint as V = 18 mag. The data presented here are of importance for understanding the dynamical history of the dwarf systems. In addition, they provide a first and tantalizing hint of the velocity dispersion in a dwarf spheroidal and suggest that Draco may have a mass-to-light ratio an order of magnitude greater than that found for galactic globulars. If confirmed, this result would support the existence of a massive halo about the Galaxy. It would furthermore rule out the possibility that neutrinos could provide a solution to the missing mass problem, if the dark matter on small and large scales is similar.

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