A molecular radio line survey of the carbon star IRAS 15194-5115

Details A molecular radio line survey of the carbon star IRAS 15194-5115 A molecular radio line survey of the carbon star IRAS 15194-5115

Mar 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...269..377n&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 269, no. 1-2, p. 377-389.

Astronomy and Astrophysics

Astronomy

30

Carbon Stars, Infrared Astronomy Satellite, Molecular Spectra, Radio Astronomy, Line Spectra, Stellar Envelopes

Scientific paper

We have made a molecular line survey of the carbon star IRAS 15194-5115 in the 3 and 1.3 mm bands with the 15 m SEST (Swedish-ESO Submillimetre Telescope). Molecular abundances are derived and compared with those of IRC + 10216. C2H, C4H, C3H2, and SiO are more abundant in IRAS 15194-5115 by about a factor of three, while the abundances of CN, CS, SiS, HNC, SiC2, C3H, C3N, and HC3N are similar in the two sources. The C-13 species are more abundant in IRAS 15194-5115, and we derive a C-12/C-13 abundance ratio of nine, which is about five times smaller than the one in IRC+10216. The mass loss rate and the envelope expansion velocity of IRAS 15194-5115 is estimated to be 5 x 10 exp -5 solar masses/yr and 22.2 km/s, respectively.

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