Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...246..146h&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 246, no. 1, June 1991, p. 146-152. Research supported by NSERC.
Astronomy and Astrophysics
Astrophysics
8
Absorption Spectra, B Stars, Line Spectra, Stellar Spectra, Nuclear Magnetic Resonance, Spectral Line Width, Stellar Oscillations, Time Series Analysis
Scientific paper
The absorption line profiles of the Be/shell star Kappa Dra(B6IIIe) vary in an almost identical fashion to those of Omicron And which it closely resembles. High signal-to-noise spectra taken over a two month interval in 1988 show rapid (hours) variations of the line profiles. The principal variations, with a period of 0.545 days, is in line width and line asymmetry. This period is probably about half the rotation period and caused by a low degree mode of nonradial pulsation. Features at only 0.3 percent of the continuum can also be seen moving from blue to red through the line profiles. Kappa Dra and Omicron And are two of the coolest B stars for which such line profile variations have been detected.
Hill Grant Michael
Walker Gordon A. H.
Yang Sheng
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