UVBY and JHKL-prime photometry of OB stars in the association Cygnus OB2

Details UVBY and JHKL-prime photometry of OB stars in the association Cygnus OB2 UVBY and JHKL-prime photometry of OB stars in the association Cygnus OB2

Mar 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991mnras.249....1t&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 249, March 1, 1991, p. 1-12. Research supported by Meri

Astronomy and Astrophysics

Astronomy

83

B Stars, Infrared Sources (Astronomy), O Stars, Stellar Spectrophotometry, Ubv Spectra, Color-Magnitude Diagram, Interstellar Extinction, Main Sequence Stars, Stellar Envelopes, Stellar Evolution, Stellar Luminosity

Scientific paper

uvby and JHK photometry was obtained of about 80 stars in the association Cygnus OB2 (VI Cygni), including some foreground stars and three infrared sources. Color-color and color-magnitude diagrams are presented from which the interstellar extinction and approximate spectral types are derived. It is confirmed that the interstellar extinction law in the direction of Cyg OB2 is similar to the galactic mean. The ratio of total-to-selective extinction is found to be R(v) = 3.04 + or - 0.09. A true distance modulus of V0 - M(v) = 11.2 + or - 0.2, corresponding to d = 1.7 + or - 0.2 kpc is derived. The majority of the stars are still on the main sequence; a minimum age of 3 Myr for the association is estimated. Only two stars in the sample show significant infrared excesses at the wavelength not less than 2.2 microns.

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