Astronomy and Astrophysics – Astronomy
Scientific paper
May 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995aas...186.3513c&link_type=abstract
American Astronomical Society, 186th AAS Meeting, #35.13; Bulletin of the American Astronomical Society, Vol. 27, p.861
Astronomy and Astrophysics
Astronomy
1
Scientific paper
We are studying the circumstellar (CS) gas around stars that are similar to beta Pictoris (A5 V), the well-known proto-planetary system candidate. This is the ultimate stage of our multiwavelength (IR+Optical+UV) search for possible planetary systems in all the A stars within 25 pc. Based on our ground-based Ca II and Na I spectra of the complete volume-limited sample of 62 A stars, we have identified at least 12 stars with possible CS gas. Since the fine-structure lines of the resonance UV1 multiplet of Fe II near 2600 Angstroms are excellent diagnostics of CS gas, we are using the IUE high-dispersion archival data of our program stars to distinguish between circumstellar and interstellar lines. We also are searching for dynamic spectral features similar to the mass flows seen in spectra of beta Pic. Finally, we are combining our visual and ultraviolet (IUE) CS gas study with our previous IRAS CS dust survey to probe the link between CS gas envelopes and dust disks. Our goal is to ascertain if these beta Pic-like stars, as a group, represent some phase of planet formation.
Bruhweiler Fred C.
Cheng Kwang-Peng
Neff James E.
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