The density structure of discs around Be stars derived from IRAS observations

Details The density structure of discs around Be stars derived from IRAS observations The density structure of discs around Be stars derived from IRAS observations

Jul 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26a...162..121w&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 162, no. 1-2, July 1986, p. 121-139. ZWO-supported research.

Astronomy and Astrophysics

Astronomy

196

B Stars, Infrared Astronomy Satellite, Stellar Envelopes, Disks (Shapes), Energy Distribution, Photosphere, Stellar Mass Ejection, Stellar Winds

Scientific paper

IRAS and other IR photometry data on the four Be stars Alpha Eri, Phi Per, Delta Cen and Chi Oph are used to analyze the physical mechanism of an observed IR excess. The study covers the spectral distribution from 1-60 microns. Attention is focused on a possible turnover point in the spectrum that will permit modeling the dimensions of the emitting region, and on the density distribution and mass loss rates of the objects. The excess radiation is quantified and fit to a model of stars with a disk viewed pole-on through a given opening angle. A growth curve is generated for excess IR and radio emissions for spherically symmetric winds. The model provides a good fit to the observed spectra. The results indicate that matter is gradually accelerated outward where the IR excess originates, and that the density and mass loss rates in the IR emitting regions are higher than would be predicted by the UV resonance lines alone.

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