期刊
PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN
卷 59, 期 4, 页码 L35-L39出版社
OXFORD UNIV PRESS
DOI: 10.1093/pasj/59.4.L35
关键词
Stars : atmosphere; Stars : Be; Stars : emission line; Stars : individual : 28 Tau; Stars : photometry; Stars : spectroscopy
Recent photometric and spectroscopic observations of Pleione are reported. Pleione showed brightness declines in both the B and V bands by similar to 0(m)25 between 2006 January and 2007 March. Significant decreases in the strengths and widths of the long-lived emission components in H alpha and H beta were observed during this period, while additional outer double-emission components appeared in these lines. Many metallic shell lines strengthened during the observation period, being accompanied by central quasi-emission components. We interpret these spectral changes in terms of a double disk: the progressive decline of a misaligned old disk in due course of precession and the formation and growth of a new disk in the star's equatorial plane.
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