Carbon stars at high Galactic latitude

Details Carbon stars at high Galactic latitude Carbon stars at high Galactic latitude

Jun 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991aj....101.2220b&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 101, June 1991, p. 2220-2228.

Astronomy and Astrophysics

Astronomy

45

Asymptotic Giant Branch Stars, Carbon Stars, Star Formation, Galactic Structure, Milky Way Galaxy, Stellar Spectra

Scientific paper

Photometry and kinematics are presented for a sample of objective prism selected carbon stars toward the north and south Galactic poles. Distances are determined by fitting the infrared colors to a giant branch. If these stars are like the carbon stars seen in dwarf spheroidal galaxies, the median distance of the sample is 28 kpc. If they are more like the carbon stars found recently in the Galactic bulge, they may be only half as distant. The surface density of carbon stars as a function of distance is remarkably consistent with an R exp 1/4 density profile for the Galactic halo. This density profile can be traced to about 15 scale radii and fills a volume similar to that occupied by globular clusters. The data yields an effective radius of either 7.0 or 3.5 kpc depending on choice of distance scale. The velocity dispersion of the sample is 96 + or - 12 km/s. A kinematic model in which vertical velocity dispersion is independent of height above the Galactic plane seems in best accord with the data.

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