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Hubble Space Telescope spectroscopy of massive hot stars in the Magellanic Clouds and M31
Lennon, D. J.; Bianchi, L.; Puls, J. +4 more
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 Δλ/λ≈1 A. One O8.5 supergiant, OB78#231, in M31
Stellar winds of massive stars in M31
Hutchings, John; Bianchi, Luciana
We have obtained the first UV high resolution spectra of hot luminous stars in M31 with the FOS onHubble Space Telescope. The spectra, combined with optical spectroscopic and photometric observations, enable us to study their stellar winds and photospheric parameters. We derive mass-loss rates and velocity laws from the wind line profiles, with th…
The population of massive stars in R136 from HST/FOC UV observations
Leitherer, Claus; Nota, Antonella; de Marchi, Guido +2 more
New ultraviolet (λ≃1300 A, λ≃3400 A),HST FOC observations have been used to derive the UV color-magnitude diagram (CMD) of R136, with the main scientific goal of studying the upper end of the stellar mass function at ultraviolet wavelengths where the color degeneracy encountered in visual CMDs is less severe. The CMD has been compared to a set of …