Other
Scientific paper
Dec 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995aas...187.2203b&link_type=abstract
American Astronomical Society, 187th AAS Meeting, #22.03; Bulletin of the American Astronomical Society, Vol. 27, p.1319
Other
1
Scientific paper
HD 163296 is commonly classified as an isolated Herbig Ae star, and therefore it may be a pre-main-sequence star with an accretion disk. Because this star is spectroscopically one of the most strongly variable members of its class and because spectrum variability may provide clues to the dynamics of the disk, we studied 7 CCD echelle spectra obtained from 1994 Jul. to 1995 Sep. with the 1-m telescope of Ritter Observatory. The spectral resolution of this material is 0.23 Angstroms at lambda 5800, and the continuum SNR ranges from about 15 to about 90. The spectral coverage consists of 9 disjoint 70- Angstroms regions in the yellow and red; features of interest in these spectra are Hα , He I lambda 5876, and Si II lambda lambda 6347, 6371. The He I line in these spectra is broad, weak, and variable, usually with emission on the blue wide of the absorption. We searched for an extended red wing, which would indicate accreting gas, but, if present, it is weak and obscured by telluric H_2O absorption lines. Published Hα profiles of this star show strong variability with a P Cygni and a double-peaked line shape appearing with about equal frequency. Although our spectra include an example of each of these line shapes, they also include a pure emission morphology with ``bumps'' but no real absorption core. Since this line shape is not only newly observed for this star but also unlike the Hα profile of any other Herbig Ae/Be star that we have seen, we conclude that our observation caught the stellar envelope in an unusual state. The variable morphology of Hα in this star calls into question the physical significance of dividing the Herbig stars into subgroups according to the line profile of Hα (P Cygni or otherwise). [amount] MLB's participation in this research was supported by the NSF.
Beaver M. L.
Morrison Nancy D.
No associations
LandOfFree
Spectroscopic Monitoring of HD 163296 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Spectroscopic Monitoring of HD 163296, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Spectroscopic Monitoring of HD 163296 will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1253324