Long-Term Spectroscopic Monitoring and Surveys of Early-Type Stars with and without Circumstellar Envelopes

Baltic astronomy

article

Anatoly S. Miroshnichenko¹  Peter Prendergast²  Steven Danford¹  Sergei V. Zharikov³  Nadine Manset⁴  Hugo Levato⁵  Monica Grosso⁵  Daniela Korčáková⁶  Anatoly V. Kusakin⁷  Serik A. Khokhlov⁸ 

[1] Department of Physics and Astronomy, University of North Carolina at Greensboro;Kernersville Observatory;Instituto de Astronomia, Universidad Nacional Autónoma de México;CFHT Corporation;Instituto de Ciencias Astronomicas;Astronomical Institute, Charles University in Prague, Faculty of Mathematics and Physics;Fesenkov Astrophysical Institute;NNLOT Al-Farabi Kazakh National University

关键词: early-type stars;    spectroscopy;    monitoring;    emission-line stars;    supergiants;   

DOI  :  10.1515/astro-2017-0027

来源: Institute of Theoretical Physics and Astronomy

【 摘 要 】

Ongoing studies of different groups of stars result in improving our knowledge of their fundamental parameters and evolutionary status. Also, they result in finding new phases of stellar evolution, which require theoretical explanation. At the same time, availability of large telescopes and sensitivity improvement of detectors shift the focus of many observational programs toward fainter and more distant objects. However, there are still many problems in our understanding of details of stellar evolution which can now be solved with small telescopes and observations of bright stars. Approaching these problems implies conducting surveys of large groups of stars and long-term monitoring of individual objects. In this talk, we present the results of recent international programs of photometric and spectral monitoring of several groups of early-type stars. In particular, we discuss the role of binarity in creation of the Be phenomenon and show examples of recently discovered binary systems as well as the problem of refining fundamental parameters of B and A type supergiants. Special attention will be paid to collaboration with the amateur community and use of échelle spectrographs mounted on small telescopes.

【 授权许可】

Unknown