Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...244..367w&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 244, no. 2, April 1991, p. 367-372.
Astronomy and Astrophysics
Astrophysics
30
Carbon Stars, Galactic Bulge, Stellar Color, Stellar Evolution, Stellar Luminosity, Carbon 13, Color-Magnitude Diagram, Hertzsprung-Russell Diagram, Magellanic Clouds, Stellar Temperature
Scientific paper
The properties of the carbon stars recently found in the galactic bulge are discussed on the basis of the observational data presented by Azzopardi et al. (1991). These stars form a relatively homogeneous group whose most luminous members show similarities with the J-type carbon stars of the Small Magellanic Cloud, although they are probably much more metal-rich. They are relatively blue and hot, rich in C-13 and several of them might be CH stars. Using a relation between the CN indices and the J-K color, the color excesses are derived, and then the dereddened J-K is used to derive the effective temperatures and bolometric magnitudes of the stars. The possible origin of these objects are discussed, and it is concluded that they probably result from mixing in relatively low-mass (0.8 solar mass) stars at the helium flash or at a somewhat later stage of evolution.
Azzopardi Marc
Lequeux James
Rebeirot E.
Westerlund Bengt E.
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