The Beta Pictoris circumstellar disk. IX - Theoretical results on the infall velocities of CA II, AL III, and MG II

Details The Beta Pictoris circumstellar disk. IX - Theoretical results on the infall velocities of CA II, AL III, and MG II The Beta Pictoris circumstellar disk. IX - Theoretical results on the infall velocities of CA II, AL III, and MG II

Oct 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...223..304b&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 223, no. 1-2, Oct. 1989, p. 304-312.

Astronomy and Astrophysics

Astrophysics

52

Comets, Metal Ions, Metallicity, Red Shift, Stellar Envelopes, Vaporizing, Absorption Spectra, Aluminum, Calcium, Line Spectra, Magnesium, Solar System

Scientific paper

Redshifted and highly time-variable circumstellar absorption lines of Ca II, Al III, Mg II and other metallic ions in the spectrum of Beta Pic are interpreted as the result of vaporization of large bodies falling in toward the star. Assuming this model, theoretical calculations on the motion of ions ejected by the infalling body and moving in the surrounding gas are carried out to explain the differences between the observed infall velocities of the ions. Given the effect of gravitation, radiation pressure and collisions, ions are subject to a limiting velocity, for which an expression is given. Numerical results show that the calculated velocities could match quite well the observations with strong conditions on the density of the surrounding gas. These conditions lead to an approximate value for the total vaporization rate of the body, which can be compared to measured cometary ones in the solar system. All this tends to reinforce the reality of infalling comets on to the star Beta Pictoris.

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