A search for planetary system candidates |
| |
| Authors: | James E Neff Kwang-Ping Cheng |
| |
| Institution: | (1) Astronomy & Astrophysics, Penn State University, University Park, 16802, PA, USA;(2) Physics Dept., California State University, 92634 Fullerton, CA, USA |
| |
| Abstract: | We report on our search for possible planetary system candidates in a volume-limited sample of 62 nearby A stars. Since the evolutionary lifetimes of A stars ( 109 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 our ground-based visual and IUE high-resolution spectroscopy of all the northern nearby A stars, we have identified at least 12 stars with circumstellar gas. Combining these results with our previous IRAS survey we are probing the link between stars with circumstellar gas and those showing circumstellar dust disks. Our aim is not just to identify stars with gas, or stars with both gas and dust, but to identify systems with dynamic spectral activity similar to Pic, a well known proto-planetary system candidate. By measuring the gas dynamics in the disks of these Pic-like stars, we can begin to study the physics of accretion disks of young evolving systems. |
| |
| Keywords: | Protoplanetary Systems Circumstellar Gas A Stars Ca II |
| 本文献已被 SpringerLink 等数据库收录！ |
|
