Huilai Cao

Chinese Academy of Sciences

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Yulian Guo

Chinese Academy of Sciences

Jordi Dachs

Institute of Environmental Assessment and Water Research

Thomas W. Berghöfer

Deutsches Elektronen-Synchrotron DESY

Uli Lemmer

Karlsruhe Institute of Technology

Yu-lian Guo

National Astronomical Observatories

Jinxin Hao

National Astronomical Observatories

Thomas Eversberg

Schnörringen Telescope Science Institute

W. S. Gao

Academia Sinica

Guo Yu-lian

Shantou University

Hui Men

Centre National de la Recherche Scientifique

Cooperative Institutions

Chinese Academy of Sciences

National Astronomical Observatories

Ruhr University Bochum

Deutsches Elektronen-Synchrotron DESY

Purple Mountain Observatory

University of Chinese Academy of Sciences

Yunnan Observatories

University of California, Berkeley

Universität Hamburg

Hamburger Fern-Hochschule

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Variations in the shell spectra of the Be star EW Lac.

Acta Astrophysica Sinica (1987)

Yulian Guo Huilai Cao W. S. Gao

Star (game theory)

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Variations in the shell spectrum of the Be star EW Lacertae

Chinese Astronomy and Astrophysics (1987)

Yu-lian Guo Huilai Cao W. S. Gao

Balmer series

Radial velocity

10.1016/0275-1062(87)90034-8

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A Spectroscopic and Photometric Study of the Shell Star EW Lac

International Astronomical Union Colloquium (2000)

Huilai Cao Zhongwei Li Lin Huang Yu-lian Guo

Abstract We report on combined spectroscopic and photometric observations of EW Lac during its outburst of 1983. At this time the star’s H α and H β 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 H β 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.

Be star

Star (game theory)

Variable star

10.1017/s0252921100056499

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MUSICOS 1996 Campaign on the δ Scuti Star V480 Tau

ESO astrophysics symposia (1998)

Jinxin Hao Huilai Cao T. Kennelly

Star (game theory)

Variable star

10.1007/978-3-540-68597-5_87

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The study on activity period of Pleione.

Xiaozhen Guo Huilai Cao Jinxin Hao

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Abrupt activities in UV spectra of the Be star FY CMa.

Mathematical Structures in Computer Science (1995)

Huilai Cao Jordi Dachs

Star (game theory)

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Analysis of IUE Spectrograms for Be stars

Springer eBooks (1994)

Thomas Eversberg Jordi Dachs Thomas W. Berghöfer Huilai Cao Uli Lemmer

Spectrogram

Star (game theory)

Ultraviolet

10.1007/978-94-011-1030-3_75

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Statistics of the Instability Strip of Cephei Stars

Chinese Journal of Astronomy and Astrophysics (2003)

Bin Tian Hui Men Licai Deng Da-Run Xiong Huilai Cao

We present a study of the Cephei instability strip based on a sample of 49 stars of this type. After deriving their effective temperatures and luminosities from their observed (B – V), (U – B) colors and parallaxes we find their positions in the HR diagram to be mostly confined to the main sequence, and their masses to lie between 7M☉ and 30M☉. Their distribution on the HR diagram matches well with our previous theoretical instability strip which has an upper bound in the luminosity and rather tight boundaries in the effective temperature.

Instability strip

Hertzsprung–Russell diagram

10.1088/1009-9271/3/2/125

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Citations (7)

Infall and Outflow Activities in the Be star FY CMa

Chinese Journal of Astronomy and Astrophysics (2001)

Huilai Cao

Unusual activity of outflow mass motion connected with infall events was recorded for the B0.5 IVe star FY CMa in February 1987 from both archival IUE spectrograms of circumstellar N resonance lines and optical spectra of Hα and He I λ5876Å emission lines which showed inverse P Cygni-type profiles. We estimate the mass loss rate using ultraviolet Si IV resonance lines with expanding atmosphere modeling calculations, and describe how the radial pressure performs the dominant role in accelerating the stellar wind. We attempt to give a qualitative explanation for the activity observed for FY CMa in terms of circumstellar matter raining down to the star.

Outflow

Star (game theory)

Radiation Pressure

Spectrogram

10.1088/1009-9271/1/6/514

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Citations (2)

Stellar Wind Variability of Be Star FY CMa

ESO astrophysics symposia (1998)

Huilai Cao Joachim Dachs

Line (geometry)

Star (game theory)

Ultraviolet

10.1007/978-3-540-68597-5_30

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