Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...237...61h&link_type=abstract
Astrophysical Journal, Part 1, vol. 237, Apr. 1, 1980, p. 61-65.
Astronomy and Astrophysics
Astrophysics
28
Carbon Monoxide, Cygnus Constellation, Infrared Spectra, Line Spectra, Stellar Spectrophotometry, Cosmic Dust, Early Stars, Emission Spectra, Hydrogen Recombinations, Interstellar Extinction, Interstellar Matter, Molecular Gases, Optical Emission Spectroscopy, Spectrum Analysis, Stellar Envelopes, Thermal Emission
Scientific paper
Spectroscopy of V645 Cyg from 1.5 to 2.5 microns and CO line observations at 2.7 mm are presented. A kinematic distance of 6 kpc is derived from the CO line velocity. The strengths of the observed members of the hydrogen Brackett recombination line series are consistent with a spectral type of O9 and an extinction of 4-5 mag to both the line-emitting region and to the exciting star. The infrared continuum is probably produced by thermal emission from hot (about 1000 K) dust. The star is embedded in a 20 pc diameter molecular cloud with a mass not less than 2500 solar masses. The cloud shows CO line broadening in the vicinity of the star and a velocity gradient perpendicular to the plane of polarization of the stellar optical emission. The system has many similarities to R Mon.
Harvey Paul Michael
Lada Charles J.
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