The Nature of the Variable Infalling Material on the Star Beta Pictoris: GHRS Observations

Details The Nature of the Variable Infalling Material on the Star Beta Pictoris: GHRS Observations The Nature of the Variable Infalling Material on the Star Beta Pictoris: GHRS Observations

Jul 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994hst..prop.5406l&link_type=abstract

HST Proposal ID #5406

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Hst Proposal Id #5406 Interstellar Medium Circumstellar Matter

Scientific paper

We propose to obtain spectroscopic diagnostics of the gaseous disk observed around the star Beta Pictoris. The high quality data obtained at the unprecedented resolution and sensitivity of the GHRS during our Cycle 2 observations under ID 3482, allowed us to clearly strengthen the idea that both the changes in spectral line shapes as well as the very presence of CI, CIV and CO simultaneously observed in the gaseous environment of the star may be explained by the evaporation of many kilometer sized bodies when approaching the star. In effect, bodies evaporating at larger distances produce an important gaseous disk responsible for the observed stable narrow absorption features in mainly neutral species (CI,FeI,MgI,CO) but also in more ionised species (CaII,MgII,FeII,even AlIII), while other bodies, falling almost directly onto the star, produce highly time variable absorption features only seen in the ionised species (CaII,MgII,FeII, AlIII,CIV). The purpose of this proposal is to study in detail the precise nature of these two different gaseous components. To link all our observations together and with previous studies, we will organise simultaneous, multisites ground based observations.

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