The circumstellar gas cloud around Beta Pictoris. II

Details The circumstellar gas cloud around Beta Pictoris. II The circumstellar gas cloud around Beta Pictoris. II

Oct 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26a...167..325v&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 167, Oct. 1986, p. 325-332.

Astronomy and Astrophysics

Astrophysics

64

Early Stars, Extrasolar Planets, Infrared Spectra, Stellar Envelopes, Stellar Spectra, Calcium, Line Spectra, Sodium, Stellar Models

Scientific paper

An analysis of high-quality echelle spectra of Beta Pic, obtained in October 1984 and March 1985 using the 1.4 m La Silla ESO telescope, indicates that the K line of Ca II is wider than the D lines of Na I, and that a velocity difference of 2 km/s exists between the approximate centers of the lines of the two species. In the circumstellar disk around Beta Pic, it is suggested that the Na I is located in an outer region which contains nearly all of the mass of the disk, and that most of the Ca II lies in an inner region having a 2 km/s redshift with respect to the outer one. Assuming a power law distribution of the total gas density throughout the disk, the gas extends inward to a radius of about 0.4 AU, and the interior region consists of a thin annulus of gas having a solar abundance of calcium.

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