Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...211.5009b&link_type=abstract
American Astronomical Society, AAS Meeting #211, #50.09; Bulletin of the American Astronomical Society, Vol. 39, p.813
Astronomy and Astrophysics
Astronomy
Scientific paper
Optical spectra [3910 - 6660 A] for 20 previously unclassified stars having 8 micron excesses in the Spitzer GLIMPSE Point Source Catalog were obtained with the Wyoming Infrared Observatory 2.3 m telescope and longslit spectrograph. The targets were selected to have K-[8.0] and J-K colors consistent with A or B stars having mid-IR excesses. The collected spectra were used to measure Halpha equivalent widths and classify the stars by comparison with stellar atlases. Two of the stars show Halpha in emission, one has mixed profiles, and 17 have Halpha in absorption. Six of the stars are evolved (luminosity class III or I) while 10 appear to be main-sequence stars. The main sequence stars with emission are probable Be stars or Herbig AeBe stars. The evolved stars may be B[e] stars with dusty photospheres. The main-sequence stars lacking Halpha emission (seven objects) may have hot circumstellar dust and are candidates for young systems with massive debris disks.
Bird Sarah
Chunev Georgi
Kobulnicky Henry
Uzpen Brian
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