Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21934412m&link_type=abstract
American Astronomical Society, AAS Meeting #219, #344.12
Astronomy and Astrophysics
Astronomy
Scientific paper
We present medium resolution absorption spectroscopy (R 6 km/s) of the CaII K-line (3933Å) recorded over a 5-night period towards the fast rotating stars HD 88195, HD 102647, HD 110411, HD 118232, HD 145964, HD 158643, HD 165459, and HD 183324. These observations have revealed significant daily variation in the level of absorption in the circumstellar gas disks that surround some of these stars. In addition, we have also observed transient absorptions that appear sporadically in these spectra that can be attributed to the passage of exo-comets as they approach the central star. Similar behavior has previously been recorded towards Beta Pic, HR 10 and HD 85905. Typically, such systems are < 10 Myr old and these observations thus allow us to witness the transition from a massive gaseous proto-planetary disk to a far less massive dusty debris disk in which large planetesimals are forming.
Cooper R. A.
Montgomery Sharon Lynn
Welsh Barry Y.
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