Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983mnras.204.1081t&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 204, Sept. 1983, p. 1081-1089.
Astronomy and Astrophysics
Astronomy
4
B Stars, Carbon Monoxide, Interstellar Matter, Molecular Clouds, Spaceborne Astronomy, Ultraviolet Spectra, Absorption Spectra, Interstellar Extinction, Iue, Line Spectra, Planetary Nebulae, Spectral Line Width, Stellar Envelopes
Scientific paper
IUE spectra of two Be stars with small colour excess are presented to show the presence of a number of absorption lines due to A-X transition of 12CO and 13CO. The column densities of 12CO and 13CO towards these two stars and upper limits for these molecules towards three other Be stars and towards planetary nebula BD+303639 are given. The observed column densities of 12CO towards Be and other stars are compared with its theoretical values. It is suggested that the observed CO towards Be stars is circumstellar in origin. This is supported by the presence of absorption from the excited 2P3/2 level of Si II, as strong as that from its ground level, 2P1/2, in the spectra of only Be stars.
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