Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aas...193.6705b&link_type=abstract
American Astronomical Society, 193rd AAS Meeting, #67.05; Bulletin of the American Astronomical Society, Vol. 30, p.1346
Astronomy and Astrophysics
Astronomy
Scientific paper
A single exposure, using the Space Telescope Imaging Spectrograph (STIS) aboard the Hubble Space Telescope (HST), shows UV spectra of approximately 40 O and B stars in the core of NGC 604, the extraordinarily bright H II region in M 33. The spectral image, acquired with the G140L grating and the MAMA detector, is of a 20" by 2" region and has a wavelength coverage from 1150 to 1730/AA. The 52" by 2" slit was used to confine the Lyalpha background to the region of aperture and to reduce contamination of overlapping UV stellar spectra surrounding the core of NGC 604. An iterative technique has been developed and used to extract individual spectra of stars seen in the aperture. These spectra clearly reveal several Wolf-Rayet stars, as well as luminous OB Supergiants. Preliminary UV spectral types have been assigned to the higher signal-to-noise spectra using criteria developed previously by Neubig & Bruhweiler. The stellar metallicity and properties of mass loss appear to be comparable to that of the Milky Way. The results of this investigation indicates that STIS spectroscopy, either acquired with the large 52" x2" slit or in slitless mode, should be an extremely important tool for probing young star-forming regions in galaxies of the Local Group.
Bruhweiler Fred C.
Collins Nathan
Lindler Don
Miskey Cherie
Plait Phil
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