文章基本信息

标题：A Multicolor Study of Polarization Variability in Isolated B[e] Stars HD 45677 and HD 50138
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作者：C. D. Lee ; C. Eswaraiah ; W. P. Chen 等
期刊名称：The Astronomical journal
印刷版ISSN：0004-6256
电子版ISSN：1538-3881
出版年度：2018
卷号：156
期号：3
页码：1-11
DOI：10.3847/1538-3881/aad3d1
语种：English
出版社：American Institute of Physics
摘要：HD 45677 and HD 50138 are two B[e] stars isolated from any known star-forming regions. We investigated thepolarization characterization of their surrounding gas and in situ dust in the inner edge of the circumstellar disk.Our measurements of the intrinsic polarization of each star between 2010 and 2011, after correcting for foregroundpolarization through field star observation, reveal a decreasing level of polarization with wavelength, with thepolarization angle independent of wavelength. However, reanalysis of literature data by applying our foregroundcorrection method clarified the relative roles of electron scattering versus dust scattering in the circumstellar disk.Combining the multicolor data from the available epochs led us to conclude that a general electron scattering-dominated disk exists in both B[e] stars, with evidence of micron-sized grains seen at some epochs, likelycondensed in the inner disk.
关键词：circumstellar matter;polarization;stars: emission-line, Be;stars: individual (HD45677, HD50138);stars: variables: general