Other
Scientific paper
Dec 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aas...183.0901n&link_type=abstract
American Astronomical Society, 183rd AAS Meeting, #09.01; Bulletin of the American Astronomical Society, Vol. 25, p.1302
Other
Scientific paper
We report on our continuing search for circumstellar gas in a volume limited sample of 62 nearby A stars. Since the evolutionary lifetimes of A stars (<= 10(9) yrs) roughly correspond to the era of planet formation and subsequent ``heavy bombardment" in our solar system, our study could provide valuable insight into the origin of our own Solar System. From high-resolution visual (NSO McMath--Pierce) and ultraviolet (IUE) spectroscopy, we have already identified several stars with circumstellar gas. We present the results of the ground-based, northern-hemisphere component of our survey. We have obtained high-resolution (lambda /Delta lambda ~ 120,000) spectra of the Ca II K and Na I D lines from each of our program stars. We are combining these results with our previous IRAS survey (Cheng et al. 1992, Ap.J., 396, L83), to probe the link between stars with circumstellar gas and those showing circumstellar dust. Our aim is not just to identify stars with gas, or stars with gas and dust, but to identify systems with dynamic spectral activity similar to beta Pic. By studying the gas dynamics in the disks of other stars like beta Pic with instruments such as Goddard High Resolution Spectrograph (GHRS), we can obtain fundamental clues to the physics of accretion disks of young evolving systems.
Bruhweiler Fred
Cheng Kwang-Ping
Neff James E.
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