A NEAR-INFRARED SURVEY OF THE INNER GALACTIC PLANE FOR WOLF-RAYET STARS. I. METHODS AND FIRST RESULTS: 41 NEW WR STARS

被引：59
|
作者：
Shara, Michael M. [1 ]
Moffat, Anthony F. J. [2 ]
Gerke, Jill [1 ]
Zurek, David [1 ]
Stanonik, Kathryn [3 ]
Doyon, Rene [2 ]
Artigau, Etienne [4 ]
Drissen, Laurent [5 ]
Villar-Sbaffi, Alfredo [2 ]
机构：
[1] Amer Museum Nat Hist, New York, NY 10024 USA
[2] Univ Montreal, Dept Phys, Montreal, PQ H3C 3J7, Canada
[3] Columbia Univ, Dept Astron, New York, NY 10027 USA
[4] AURA, Gemini Observ, La Serena, Chile
[5] Univ Laval, Dept Phys, Quebec City, PQ G1K 7P4, Canada
来源：
ASTRONOMICAL JOURNAL | 2009年 / 138卷 / 02期
关键词：
Galaxy: disk; Galaxy: stellar content; stars:; emission-line; Be; stars: Wolf-Rayet; surveys; H II REGIONS; VIITH CATALOG; GALAXY; SPECTROMETER; EXTINCTION; GLIMPSE; DUST;
D O I：
10.1088/0004-6256/138/2/402
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
The discovery of new Wolf-Rayet (WR) stars in our Galaxy via large-scale narrowband optical surveys has been severely limited by dust extinction. Recent improvements in infrared technology have made narrowband-broadband imaging surveys viable again. We report a new J, K, and narrowband imaging survey of 300 deg(2) of the plane of the Galaxy, spanning 150 degrees in Galactic longitude and reaching 1 degree above and below the Galactic plane. The survey has a useful limiting magnitude of K = 15 over most of the observed Galactic plane, and K = 14 within a few degrees of the Galactic center. Thousands of emission line candidates have been detected. In spectrographic follow-ups of 173 WR star candidates we have discovered 41 new WR stars, 15 of type WN and 26 of type WC. Star subtype assignments have been confirmed with K-band spectra, and distances approximated using the method of spectroscopic parallax. A few of the new WR stars are among the most distant known in our Galaxy. The distribution of these new WR stars is seen to follow that of previously known WR stars along the spiral arms of the Galaxy. Tentative radial velocities were also measured for most of the new WR stars.
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收藏
页码：402 / 420
页数：19
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