Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989esasp.302..167b&link_type=abstract
In ESA, Physics and Mechanics of Cometary Materials p 167-172 (SEE N90-19989 12-90)
Astronomy and Astrophysics
Astronomy
1
Comets, Disk Galaxies, Dust, Gas Mixtures, Infrared Stars, Stellar Envelopes, Grazing Incidence, Infrared Astronomy Satellite, Protoplanets, Satellite Observation, Sun
Scientific paper
The IRAS (Infrared Astronomy Satellite) star beta Pictoris, as the only one in which a disk made of both dust and gas has been detected, is studied. Spectroscopic observations of beta Pic revealed that some metallic absorption lines present redshifted additional components which strongly variate with time. This is interpreted as the result of the infall of small evaporating cometary-like bodies toward the star. To improve this model, a theoretical description of such an event is taken. Numerical simulations of such infalling bodies are able to reproduce quite faithfully the observed behavior of some metallic ions, and the observed difference between these behaviors is explained by means of radiation pressure. Some constraints on the orbits of the bodies are deduced through the simulations which should be related to a possible interpretation concerning beta Pic's disk.
Beust Hervé
Ferlet Roger
Lagrange-Henri Anne-Marie
Vidal-Madjar Alfred
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