HST observations of the gas around \bp : additional evidence for infalling evaporating bodies

Details HST observations of the gas around \bp : additional evidence for infalling evaporating bodies HST observations of the gas around \bp : additional evidence for infalling evaporating bodies

Dec 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aas...183.4108f&link_type=abstract

American Astronomical Society, 183rd AAS Meeting, #41.08; Bulletin of the American Astronomical Society, Vol. 25, p.1353

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Spectroscopic studies of the circumstellar (CS) gas around \bp\ since 1984 have led to the detection of strong short-term variations in the CS lines of ionized species (see for instance Ferlet \etal , 1987, A&A 185, 267, and Lagrange \etal , 1992, A&A 264, 637 for the visible data and Lagrange \etal , 1988, A&A 190, 275 for the UV data), tentatively attributed to evaporation from solid, cometary-like bodies falling on the star. Detailed simulations of such a scenario have been developed and reproduce the medium resolution UV as well as the high resolution visible data available so far (Beust \etal , 1990, A&A 236, 202; 1991, A&A, 241, 488; Beust and Tagger, 1993, Icarus, in press). In this poster, we will present high resolution UV spectra obtained in December 1992 with the Hubble Space Telescope GHRS. These data (Vidal-Madjar \etal , 1993, A&A, to be submitted) enable us to confirm the presence of very ionized species around \bp\ such as Civ, already proposed by Deleuil et al. (1993, A&A 267, 187) from IUE data, but also to detect unambiguously the molecular species CO. The variable parts of other CS lines (e.g., Feii, Mgii, Aliii), observed with unprecedented high resolution and high signal-to-noise, also bring strong support to the evaporating infalling body scenario.

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