Completion of a Survey for Disk Lines Around Rapidly-Rotating A Stars

Details Completion of a Survey for Disk Lines Around Rapidly-Rotating A Stars Completion of a Survey for Disk Lines Around Rapidly-Rotating A Stars

Aug 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000noao.prop...56a&link_type=abstract

NOAO Proposal ID #2000B-0056

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Scientific paper

We wish to complete our survey of 178 A northern stars in the Bright Star Catalogue that have projected rotational velocities > 200 km/s to search for disk lines of Ti II near 3700 A. They indicate hot inner disks. During semester 2000A we found 11 out of 92 to have disk lines (but with an unexpected galactic longitude distribution). We also had time to find disk absorption cores in Ca II H& K and H delta in the same 11 stars, but not in the other stars. Those will allow us, with assumptions about abundances, to derive temperatures and disk masses. Are all these disks similar in dimensions and temperatures? We wonder about the production method for the disks, but our data may not tell us that.

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