Near-simultaneous Spectroscopic and Broadband Polarimetric Observations ofBE Stars

Details Near-simultaneous Spectroscopic and Broadband Polarimetric Observations ofBE Stars Near-simultaneous Spectroscopic and Broadband Polarimetric Observations ofBE Stars

Aug 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aj....118.1061g&link_type=abstract

The Astronomical Journal, Volume 118, Issue 2, pp. 1061-1072.

Astronomy and Astrophysics

Astronomy

4

Key Words: Stars: Emission-Line, Be, Techniques: Polarimetric, Techniques: Spectroscopic

Scientific paper

Near simultaneous optical spectroscopic (on four nights) and broadband linear continuum (B, V, R,and I bands) polarimetric (on seven nights) observations of 29 Be stars were carried out during 1993November-December. The program Be stars displayed wavelength dependence of intrinsic polarizations with no frequency dependence of polarimetric position angles. Some of the Be stars displayed long-term polarization variability. The Be and Be-shell stars could not be distinguished from one another solely on the basis of their polarization values. Full widths at half-maximum of the Hα profiles and the intrinsic linear continuum polarizations are closely correlated with the projected rotational velocities of the program stars. Photospheric-absorption-corrected equivalent widths of Hα profiles [W(alpha)] and the radii of Hα-emitting or -absorbing envelopes (R_e or R_a) are nonlinearly correlated with the intrinsic continuum polarizations of these stars. However, W(alpha) and R_e are linearly correlated. With large uncertainties, there is a trend of spectral dependence of polarization. Detailed discussion of these results is presented in this paper.

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