Discovery of two Galactic Wolf-Rayet stars in Circinus

Details Discovery of two Galactic Wolf-Rayet stars in Circinus Discovery of two Galactic Wolf-Rayet stars in Circinus

2010-10-06

arxiv.org/abs/1010.1172v1

Astronomy and Astrophysics

Astrophysics

Galaxy Astrophysics

6 pages, 3 figures, accepted for publication on MNRAS

Scientific paper

10.1111/j.1365-2966.2010.17431.x

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 WR67a and WR67b, indicate that they are Wolf-Rayet stars of WN6h and WC8 sub-types, respectively. WR67a presents a weak-lined spectrum probably reminiscent of young hydrogen rich main-sequence stars such as WR25 in Car OB1 and HD97950 in NGC3603. Indeed, this conclusion is reinforced by the close morphological match of the WR67a H- and K-band spectra with that for WR21a, a known extremely massive binary system. WR67b is probably a non-dusty WC8 Wolf-Rayet star that has a 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.

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