Faint carbon stars in the Small Magellanic Cloud. II.

Details Faint carbon stars in the Small Magellanic Cloud. II. Faint carbon stars in the Small Magellanic Cloud. II.

Nov 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995a%26a...303..107w&link_type=abstract

Astronomy and Astrophysics, v.303, p.107

Astronomy and Astrophysics

Astrophysics

35

Stars: Carbon, Small Magellanic Cloud, Jhk Photometry, Spectroscopy, Stars: Evolution, Galaxies: Stellar Content

Scientific paper

We have obtained JHK photometry for 50 carbon stars in the Small Magellanic Cloud and medium-dispersion spectra for 37 of them. 39 of the stars have K>13mag. M_bol_ and log T_eff_ are derived from (J-K)_0_ with the aid of available relations. The least luminous star has M_bol_~-1.8mag; most of the stars are rather warm. The faint end of the M_bol_ range of the SMC C stars falls well below the lowest luminosity observed so far for C stars in Local Group dwarf spheroidals. Most of the stars with M_bol_<-2.7mag appear to be on the post-flash side of the locus for the onset of the first helium flash in double shell sources; for the fainter ones the choice between this mechanism or another one, so far unknown, is still open.

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