Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26as...78..431h&link_type=abstract
Astronomy and Astrophysics Supplement Series (ISSN 0365-0138), vol. 78, no. 3, June 1989, p. 431-436.
Astronomy and Astrophysics
Astrophysics
6
B Stars, Linear Polarization, Stellar Envelopes, Variable Stars, Astronomical Photometry, Binary Stars, Supergiant Stars
Scientific paper
Linear polarization measurements are presented for 14 Be stars obtained at McDonald Observatory during four observing runs from June to November of 1983. Methods of observation and data reduction are described. Seven of eight program stars observed on six or more nights exhibited obvious polarimetric variations on time scales of days or months. The incidence is estimated as 50 percent and may be as high as 93 percent. No connection can be found between polarimetric variability and rapid periodic light or spectroscopic variability. Ultrarapid variability on time scales of minutes was searched for with negative results. In all cases, the position angles also show variations indicating that the axis of symmetry of the circumstellar envelope changes its orientation in space.
Guo Zhi-Hui
Hsu J. C.
Huang Ling
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