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NGC 2070 and NGC 3603

Published online by Cambridge University Press:  04 August 2017

You-Hua Chu ,
Patrick Seitzer  and
Nolan Walborn
You-Hua Chu
Affiliation:
University of Illinois at Urbana-Champaign
Patrick Seitzer
Affiliation:
Kitt Peak National Observatory
Nolan Walborn
Affiliation:
Space Telescope Science Institute

Extract

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Giant H II regions are usually so distant that only the integrated properties of their stellar contents can be studied. However, the nearby giant H II regions 30 Doradus in the Large Magellanic Cloud and NGC 3603 in the Galaxy offer a rare opportunity for a spatially resolved study of their central stellar associations — NGC 2070 and NGC 3603. We have obtained 4m prime focus plates with interference filters centered on the He II 4686 line (Δλ = 65 A) and the adjacent blue continuum at 4765 A (Δλ = 70 A) to identify the Wolf-Rayet (WR) stars in their cores. We have also obtained CCD images in UBVRI for NGC 2070, and BVRI for NGC 3603 to determine their color-magnitude diagrams and luminosity functions. Since the WR stars in the core of 30 Dor have been reported by Chu, Cassinelli, and Wolfire (1984) and Moffat, Seggewiss, and Shara (1985), and the CCD photometry of NGC 2070 and 3603 is still preliminary, we will discuss in these proceedings only the WR stars resolved in the core of NGC 3603.

Type
Poster Papers 4
Information
Symposium - International Astronomical Union , Volume 116: Luminous Stars and Associations in Galaxies , 1986 , pp. 515 - 516
Copyright
Copyright © Reidel 1986 

References

Chu, Y.-H., Cassinelli, J. P., Wolfire, M. G. 1985, Ap. J., 283, 560.Google Scholar
Moffat, A. F. J., Seggewiss, W., and Shara, M. M. 1985, Ap. J., in press.Google Scholar
Walborn, N. R. 1973, Ap. J. Letters, 182, L21.Google Scholar
Weigelt, G., Baier, G., and Ladebeck, R. 1985, ESO Messenger, No. 40.Google Scholar