POLARIZATION VARIABILITY AMONG WOLF-RAYET STARS .7. THE SINGLE STARS WR-14, WR-25, AND WR-69

被引：21
|
作者：
DRISSEN, L
ROBERT, C
MOFFAT, AFJ
机构：
[1] OBSERV ASTRON MT MEGANTIC,MONTREAL H3C 3J7,QUEBEC,CANADA
[2] UNIV MONTREAL,DEPT PHYS,MONTREAL H3C 3J7,QUEBEC,CANADA
来源：
ASTROPHYSICAL JOURNAL | 1992年 / 386卷 / 01期
关键词：
CIRCUMSTELLAR MATTER; POLARIZATION; STARS; MASS-LOSS; WOLF-RAYET;
D O I：
10.1086/171014
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We have monitored over an interval of 1 month the linear polarization in visible light of three single Wolf-Rayet stars, WR 14 (WC6), WR 25 (WN7), and WR 69 (WC9). As for other early-type WC stars, WR 14 is not significantly variable (at the sigma approximately 0.03% level) during this set of observations; however, its mean polarization level is significantly different from its value in 1987. The two other stars do vary (sigma approximately 0.06%) as expected for late-type W-R stars of either sequence. The high value of P(max)/E(B-V) greater-than-or-equal-to 11 for WR 25 suggests an extremely high efficiency of grain alignment in the line of sight to the star. The wavelength dependency of the polarization angle, as well as long-term variability in the U band, suggest some intrinsic polarization component as well for this star.
引用
收藏
页码：288 / 292
页数：5
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