Infrared and submillimetre studies of Vega-excess stars

Details Infrared and submillimetre studies of Vega-excess stars Infrared and submillimetre studies of Vega-excess stars

Jun 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998mnras.296..934c&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 296, Issue 4, pp. 934-942.

Astronomy and Astrophysics

Astronomy

30

Dust, Extinction, Ism: Molecules, Infrared: Stars

Scientific paper

We report new infrared and submillimetre observations of a sample of 24 candidate Vega-excess stars, and derive CO masses, dust masses, gas to dust ratios and the strengths of various emission lines. Most of these stars have dustier discs than the class archetypes (Vega, Fomalhaut, beta Pic, etc.), yet, like the archetypes, all the stars observed in CO show the gas content of their discs to be depleted compared with molecular cloud values. We discuss how the extra dust content might imply that these stars are less evolved than the archetypes, and use other infrared and submillimetre characteristics to support this contention.

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