Mathematics – Logic
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21542710m&link_type=abstract
American Astronomical Society, AAS Meeting #215, #427.10; Bulletin of the American Astronomical Society, Vol. 42, p.344
Mathematics
Logic
Scientific paper
Rigel is a massive blue supergiant star with a radiation-driven stellar wind. Its H alpha line profile is known to be strongly variable, for reasons that are poorly understood. Our observational data consist of 192 echelle spectra (R = 26,000) taken over the course of 10 seasons with the 1.1-m telescope of The University of Toledo's Ritter Observatory. The H alpha profiles were classified into morphological categories, such as P Cygni, double-peaked, inverse P Cygni, pure absorption, pure emission, etc., and the frequency of occurrence of each category computed. Radial velocities of C II 6578, 6582 and of the absorption and emission components of H alpha were measured. In 2006, we observed a high-velocity H alpha absorption event, similar to those observed in this star in 1993 and 1994 by Kaufer et al. (1996, A&A, 314, 599). As Israelian et al. (1997, MNRAS, 290, 521) found during the 1993 event, we found possible evidence for infalling material in the aftermath of the 2006 event. The observations rule out periodicity in the occurrence of these major absorption events, but numerous minor enhancements in the blue absorption wing of H alpha were observed at apparently random times. A preliminary period search of the whole data set with the IRAF implementation of PDM yielded no periodicity in the radial velocities. A more detailed time-series analysis is planned. These results indicate that, as other authors have also pointed out, the wind of this star is inhomogeneous and irregular.
This research was partially supported by NSF-PREST award AST-0440784. During the time frame of these observations, Ritter Observatory received support from the Fund for Astrophysical Research and the American Astronomical Society Small Grants Program.
Morrison Nancy D.
Rother S.
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