The unusual star V439 CYG

Details The unusual star V439 CYG The unusual star V439 CYG

Jul 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990ap%26ss.169...31p&link_type=abstract

(IAU, European Regional Astronomy Meeting on New Windows to the Universe, 11th, La Laguna, Spain, July 3-8, 1989) Astrophysics a

Astronomy and Astrophysics

Astrophysics

3

B Stars, O Stars, Stellar Evolution, Stellar Spectra, Emission Spectra, H Lines, Infrared Radiation, Interstellar Extinction, Wolf-Rayet Stars

Scientific paper

V439 Cyg, a strange star belonging to the Berkeley 87 clusters, changed its spectrum in recent decades from a late type to an early type. The present spectral type is (O9.5-B0) with narrow H-alpha and H-beta emission lines and broad, partially filled-in, Balmer absorption lines, at shorter wavelengths, very similar to those of several X-ray sources. An extremely strong IR excess and the anomalous reddening of the star render the case of V439 Cyg one of the most exciting theoretical puzzles of astrophysics.

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