Ghrs-Observations of Candidate Beta Pictoris-Like Circumstellar Gaseous Disk

Details Ghrs-Observations of Candidate Beta Pictoris-Like Circumstellar Gaseous Disk Ghrs-Observations of Candidate Beta Pictoris-Like Circumstellar Gaseous Disk

Jul 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995hst..prop.5885l&link_type=abstract

HST Proposal ID #5885

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Hst Proposal Id #5885 Interstellar Medium

Scientific paper

The gaseous parts of dust disks surrounding main sequence stars have been the subject of intense investigations since 1985. The spectral signatures of Beta Pictoris led to the explanation that the gas content whose origin was a puzzle in such an evolved disk is produced by the evaporation of many small bodies. A way to progress in that field is to search for gas signatures in the environment of other stars presenting known IR excesses or shell characteristics. This study was started from the ground and should be continued now in the UV where stronger lines are available. From ground- based observations, we have shown that four stars present weak circumstellar gas signatures (Lagrange-Henri et al 1990). More recently, two additionnal candidates were discovered in an optical survey of the local interstellar medium. But from the ground, it is clear that having access to essentially only the CaII lines is a strong limitation. The UV observation of these lines of sight will give us a detailed view of the circumstellar material. The inconsistent conclusions about possible gas absorption towards Alpha PsA with IUE and GHRS show the limitation of IUE Studies. Here we propose GHRS observations of four of these stars in order to confirm the existence of the circumstellar gas, to improve our knowledge of such gaseous disk, and to understand the origin of this gas at somewhat later stages of the stellar evolution.

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