Other
Scientific paper
Mar 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997ieees.......10t&link_type=abstract
Spectrum, p. 10
Other
Carbon Stars, Galactic Halos, Cool Stars, Dwarf Galaxies, Dwarf Stars, Surveys, Distance, Infrared Radiation, Intergalactic Media, Isolation, Luminosity, Magellanic Clouds, Polar Regions
Scientific paper
Most carbon stars are high luminosity giants. With characteristic spectra and distinctive optical and infrared colours, they can readily be detected out to large distances in the galactic halo. The surface density of such faint carbon stars is low, approx. 1 per 50 square degrees, and there seem to be at least three kinds of halo carbon stars present: the normal asymptotic giant branch stars, known as N-type carbon stars, the first generation old carbon stars of the galactic halo, known as CH-type carbon stars and a lesser number of faint high latitude carbon stars which show significant proper motion and have the luminosity of main sequence dwarfs, the dwarf carbon stars. N-type carbon stars, with intermediate ages of 1-7 Gyrs, seem unlikely to have formed in the galactic halo in isolation from other star forming regions. Before the APM survey, only a handful of these stars were known and there was much speculation as to their origin. One possibility that we are investigating is that they either arise from the disruption of tidally captured dwarf satellite galaxies or are a manifestation of the long-sought optical component of the Magellanic stream.
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