Two mass-losing carbon stars in the Galactic halo

Details Two mass-losing carbon stars in the Galactic halo Two mass-losing carbon stars in the Galactic halo

Dec 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997mnras.292..686g&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 292, p. 686

Astronomy and Astrophysics

Astronomy

16

Carbon Stars, Stellar Mass Ejection, Galactic Halos, Infrared Astronomy Satellite, Spectral Energy Distribution, Asymptotic Giant Branch Stars, Visible Spectrum, Carbon Monoxide, Line Spectra, Stellar Luminosity

Scientific paper

Observations of two mass-losing carbon stars in the Galactic halo, IRAS 08546 + 1732 and 12560 + 1656, are presented. These objects were discovered serendipitously, and stand out from the usual carbon stars at high galactic latitudes in that they have optical and IRAS colors consistent with current mass-loss. New optical spectra, CO observations, and modelling of the spectral energy distribution and of the CO lines are presented. Luminosities are derived using a period-luminosity relation. From the dust modelling IRAS 08546 + 1732 is found to be at 20 kpc from the sun (11.3 kpc from the Galactic plane) and has a mass-loss rate of 3.3 x 10 exp -6 solar masses/yr. From the CO nondetection we deduce that it is probably oxygen-deficient, corroborating earlier work. IRAS 12560 + 1656 is found to be at 8.0 kpc from the sun (7.8 kpc from the Galactic plane) and has a mass-loss rate of 1.3 x 10 exp -6 solar masses/yr. The detection of the (C-12)O J = 2-1 transition in the spectrum of IRAS 12560 + 1656 after an integration time of 10 h makes it probably the longest (C-12)O integration on a stellar object. The detection itself makes the star one of the most distant stellar objects detected in the CO line. We examine existing data on the 'faint high-latitude carbon stars' and identify two additional distant, mass-losing, N-type AGB stars.

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