Journal Article

Discovery of two Galactic Wolf–Rayet stars in Circinus

A. Roman-Lopes

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 410, issue 1, pages 161-165
Published in print January 2011 | ISSN: 0035-8711
Published online December 2010 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2010.17431.x
Discovery of two Galactic Wolf–Rayet stars in Circinus

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I report the discovery of two new Galactic Wolf–Rayet stars in Circinus via detection of their C, N and He near-infrared emission lines, using ESO-NTT-SOFI archival data. The H- and K-band spectra of WR 67a and WR 67b indicate that these are Wolf–Rayet stars of WN 6h and WC 8 subtypes, respectively. WR 67a presents a weak-lined spectrum probably reminiscent of young hydrogen-rich main-sequence stars, such as WR 25 in Car OB1 and HD 97950 in NGC 3603. Indeed, this conclusion is reinforced by the close morphological match of the WR 67a H- and K-band spectra with that for WR 21a, a known extremely massive binary system. WR 67b is probably a non-dusty WC 8 Wolf–Rayet star that has an estimated heliocentric distance of 2.7 ± 0.9 kpc, which for its Galactic coordinates puts the star probably in the near portion of the Scutum–Centaurus arm.

Keywords: stars: Wolf–Rayet; infrared: stars

Journal Article.  3319 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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