Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...181.5112g&link_type=abstract
American Astronomical Society, 181st AAS Meeting, #51.12; Bulletin of the American Astronomical Society, Vol. 24, p.1207
Astronomy and Astrophysics
Astronomy
Scientific paper
During a uvby photometric survey of ten thousand Solar-type stars, Erik Olsen (Denmark) has isolated a small number of stars with uniquely peculiar photometric indices. These are being observed at MK resolution (2 Angstroms) with the 60cm Helen Sawyer Hogg Telescope of the University of Toronto Southern Observatory at Las Campanas Observatory in Chile and with the 84cm telescope of the San Pedro Martir Observatory in Mexico. Preliminary classifications are presented for stars observed up to now. One of the most interesting stars is HD 204848, which is a weak-lined carbon star with a preliminary classification of K0 III: Fe-2.5,CN-3,CH+1, indicating that it is carbon-strong and nitrogen-weak. It also has been observed at high resolution with the David Dunlap Observatory 1.88m telescope. There are a few stars with similar characteristics and several with quite different peculiarities. In addition, the twenty weakest-lined stars and the twenty strongest-lined stars from Olsen's homogeneous sample are being observed in order to set up parallel sequences of weak-lined and strong-lined G stars.
Beattie Brian
Garrison Robert F.
Thompson John
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