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2MASS observations of Wolf-Rayet stars and galaxies

  • Schuyler D. Van Dyk (a1), Thomas H. Jarrett (a1), Roc M. Cutri (a1) and Michael F. Skrutskie (a2)

Abstract

The Two Micron All Sky Survey (2MASS) has observed a number of Wolf-Rayet stars and galaxies at J (1.25 μm), H (1.65 μm), and K s (2.17 μm), as part of its systematic coverage of the entire sky with automated 1.3-m telescopes at Mt. Hopkins, AZ, and CTIO, Chile. The cameras observe the sky in the three channels simultaneously, using 256 x 256 HgCdTe-detector arrays. The survey samples the sky in 6° x 8.'3 tiles. The 2MASS Production Processing System transforms the raw binary survey data to final atlas images and source extractions with precise photometric calibration and astrometric positions. The survey's 10σ sensitivity is 15.8 mag at J, 15.1 at H, and 14.3 at K s . In this poster we will present results from our analysis of several objects. We have observed WR stars both with and without associated ring nebulae. 2MASS imaging of the WR galaxies is far less affected by extinction, which can obscure much of the star formation activity. We will place these starburst dwarf galaxies in context with other galaxies, based on their near-IR colors and properties.

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Copyright

References

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Bessell, M.S., Brett, J.M. 1988, PASP 100, 1134
Conti, P.S. 1991, ApJ 377, 115
Miller, G.J., Chu, Y.-H. 1993, ApJS 85, 137
Rieke, G.H, Lebofsky, M.J. 1985, ApJ 288, 618
van der Hucht, K.A., Conti, P.S., Lundström, I., Stenholm, B. 1981, SSR 28 227

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