Hubble Space Telescope spectroscopy of massive hot stars in the Magellanic Clouds and M31 |
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| Authors: | S M Haser D J Lennon R -P Kudritzki J Puls N R Walborn L Bianchi J B Hutchings |
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| Institution: | (1) Universitatssternwarte Munchen, Scheinerstrasse 1, D-81679 Munchen, Federal Republic of Germany;(2) Space Telescope Science Institute, 3700 San Martin Drive, 21218 Baltimore, MD, USA;(3) Dominion Astrophysical Observatory, NRC of Canada, 5071 West Saanich Road, V8X4M6 Victoria, B.C., Canada;(4) Present address: Max-Planck-Inst. fur Astrophys., Karl-Schwarzschild-Str. 1, D-85748 Garching bei Munchen, Federal Republic of Germany;(5) Present address: Osservatorio Astronomico di Torino, 10025 Pino Torinese (TO), Italy |
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| Abstract: | Using the Hubble Space Telescope (HST) and the Faint Object Spectrograph (FOS) high signal to noise spectrograms were obtained for 15 OB stars in the Magellanic Clouds***, three of which are of spectral type O3. The data cover the spectral region from 1150 A – 2300 A with a resolution of   / 1 A. One O8.5 supergiant, OB78#231, in M31 is also included in this work. These data are a substantial improvement on previous high resolution IUE observations in the Magellanic Clouds (Walborn et al. 1985 and references therein) because of the smaller aperture and the much better signal to noise ratio, while no high resolution UV spectra of O stars in M31 have been obtained before. In this paper we discuss various morphological aspects of the spectra, concerning metallicity and the stellar winds, compared to galactic analogues. |
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| Keywords: | Hot stars extragalactic UV spectroscopy metallicity |
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