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Spectroscopy of 13 high mass stars in the Cyg OB2 association

Aiming to explore weak spectral features of stellar and interstellar origin we used the NES echelle spectrograph of the 6-m telescope to obtain high-resolution spectra for 13 hot O3 - B4 stars in the Cyg OB2 association, including a high luminous star No. 12. Velocity fields in the atmospheres and interstellar medium, characteristics of optical spectra and line profiles are investigated. The cascade star formation scheme for the association is confirmed. Evidence is presented suggesting that the hypergiant Cyg OB2 No.12 is an LBV object and that its anomalous reddening has a circumstellar nature.

preprint2013arXivOpen access
E. L. ChentsovV. G. KlochkovaV. E. PanchukM. V. Yushkin
astro-ph.SR
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E. L. ChentsovV. G. KlochkovaV. E. PanchukM. V. Yushkin

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