Volume 396, Number 2, December III 2002
|Page(s)||533 - 538|
|Section||Galactic structure, stellar clusters, and populations|
|Published online||03 December 2002|
A new Wolf-Rayet star in Cygnus*
ESO/ST-ECF, Karl-Schwarzschild-Strasse 2, 85748 Garching bei München, Germany
2 ESO, Karl-Schwarzschild-Strasse 2, 85748 Garching bei München, Germany e-mail: firstname.lastname@example.org
3 Max-Planck Institut für Astronomie, Königstuhl 17, 69117 Heidelberg, Germany e-mail: email@example.com
4 Departament d'Astronomia i Meteorologia, Universitat de Barcelona, Av. Diagonal 647, 08028 Barcelona, Spain e-mail: firstname.lastname@example.org;email@example.com
Corresponding author: A. Pasquali, firstname.lastname@example.org
Accepted: 19 September 2002
We report the discovery of a new Wolf-Rayet star in the direction of Cygnus. The star is strongly reddened but quite bright in the infrared, with , and KS = 7.09 (2MASS). On the basis of its spectrum, we have classified WR 142a a WC8 star. We have estimated its properties using as a reference those of other WC8 stars in the solar neighbourhood as well as those of WR 135, whose near-infrared spectrum is remarkably similar. We thus obtain a foreground reddening of mag, , , , K, , yr-1. The derived distance modulus, mag, places it in a region occupied by several OB associations in the Cygnus arm, and particularly in the outskirts of both Cygnus OB2 and Cygnus OB9. The position in the sky alone does not allow us to unambiguously assign the star to either association, but based on the much richer massive star content of Cygnus OB2 membership in this latter association appears to be more likely.
Key words: stars: emission line, Be / stars: fundamental parameters / stars: Wolf-Rayet / Galaxy: open clusters and associations: general
© ESO, 2002
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