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Wolf-Rayet stars. VI. The nature of the optical and infrared continuum

Cohen, M; Barlow, MJ; Kuhi, LV; (1975) Wolf-Rayet stars. VI. The nature of the optical and infrared continuum. Astronomy & Astrophysics , 40 (3) pp. 291-302. Green open access

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Abstract

Results of IR photometry between 1.6 and 11.3 microns are combined with results of scanner photometry between 3300 and 11,100 A to produce composite energy distributions for Wolf-Rayet stars. Reddening corrections are subtracted from the distributions to obtain IR-excess difference spectra which are fitted to either free-free emission or blackbody-like continua. WN stars are found to exhibit only free-free emission, while only WC stars show effects due to dust. Red and near-IR spectra are obtained for WC9 stars, and evidence is presented in favor of visual extinction by circumstellar dust around the star Ve2-45. The IR excesses in WC stars are interpreted as thermal emission by graphite grains; on this basis, radii and dust masses of circumstellar shells are estimated. Based on all these results, an evolutionary scheme is suggested for WC9 stars.

Type: Article
Title: Wolf-Rayet stars. VI. The nature of the optical and infrared continuum
Open access status: An open access version is available from UCL Discovery
Publisher version: https://ui.adsabs.harvard.edu/abs/1975A%26A....40....
Language: English
Additional information: This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Science & Technology, Physical Sciences, Astronomy & Astrophysics
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy
URI: https://discovery.ucl.ac.uk/id/eprint/10095214
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