Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...296l...7a&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 296, Sept. 1, 1985, p. L7-L11.
Astronomy and Astrophysics
Astronomy
23
Andromeda Galaxy, Carbon Stars, Dwarf Galaxies, Infrared Astronomy, Local Group (Astronomy), Stellar Evolution, Stellar Spectra, Asymptotic Giant Branch Stars, Charge Coupled Devices, M Stars, Stellar Luminosity, Stellar Mass Ejection
Scientific paper
One, and possibly two, carbon stars and an M giant are reported in And II, a dwarf spheroidal companion of M31. Infrared photometry indicates an extended asymptotic giant branch in And II, reaching -4.5 bolometric magnitude for m - M = 24.3. These results can be understood in terms of the third dredge-up mechanism in asymptotic giant branch (AGB) stars, if And II has spent approximately half its life as a gas-rich star-forming irregular galaxy. But the alternative possibility that these luminous late-type stars could be a consequence of binary mass transfer cannot be ruled out. In either event, the presence of AGB carbon stars may be a general characteristic of dwarf spheroidal galaxies, as they are also found in most of the spheroidal systems that surround the Milky Way.
Aaronson Marc
Gordon Geoffrey
Mould Jeremy
Olszewski Edward
Suntzeff Nicholas
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