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Session 47 - Circumstellar Disks & Shells.
Display session, Thursday, January 08
Exhibit Hall,
We present the results of high-resolution spectroscopic observations of four late B-type stars with strong far-IR excesses (HD 4881, HD 5839, HD 224648, and HD 179218) obtained with the 1-meter telescope of the Ritter Observatory in a spectral range of 5300 - 6700 ÅDouble-peaked H\alpha\ emission line profiles are detected in HD 4881 and HD 5839, while HD 224648 displays no emission in H\alpha. The remarkable variations of the H\alpha\ line profile we found in HD 179218 are also observed in some classical Be and Herbig Ae/Be stars. Parallaxes measured by the HIPPARCOS satellite were used to determine positions of the stars in the HR diagram. The former two stars are located nearly 1^m above main sequence and are most likely newly discovered classical Be stars. HD 224648, having very small near-IR excess, is probably a young main sequence star. HD 179218, which exhibits the largest near- and far-IR excess in the sample, is probably a pre-main-sequence Herbig Be star. This star does not belong to any known star formation region, but it shows a compact nebula which is similar to those of isolated young intermediate-mass stars.
The author(s) of this abstract have provided an email address for comments about the abstract: cmulliss@physics.utoledo.edu
