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A Spectroscopic and Photometric Study of the Shell Star EW Lac

Published online by Cambridge University Press:  12 April 2016

Huilai Cao ,
Zhongwei Li ,
Lin Huang  and
Yulian Guo
Huilai Cao
Affiliation:
National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China Beijing Astrophysics Center, Peking University, Beijing 100871, China Beijing Astronomical Observatory, Beijing 100012, China
Zhongwei Li
Affiliation:
Astronomy Department, Beijing Normal University, Beijing 100875, China
Lin Huang
Affiliation:
Beijing Astronomical Observatory, Beijing 100012, China
Yulian Guo
Affiliation:
Beijing Astronomical Observatory, Beijing 100012, China

Abstract

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We report on combined spectroscopic and photometric observations of EW Lac during its outburst of 1983. At this time the star’s Hα and Hβ lines showed strong doubled-peaked emission profiles which were variable with time. UBV photometry exhibited a long-term and frequent erratic short-term variations. The amplitude of U, B and V variations reached about 0.3 magnitude on October 15, 1983. Both Hβ emission and the structure of the shell absorption lines of the star also displayed anomalous behavior in 1983. It is evident that this star was in a strong active phase at that time.

Type
6. Disks
Information
International Astronomical Union Colloquium , Volume 175: The Be Phenomenon in Early-Type Stars , 2000 , pp. 554 - 557
Copyright
Copyright © Astronomical Society of the Pacific 2000

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