An Analysis of STIS HST UV Spectra of M33 early B Supergiants

Abstract

We present terminal velocities of M33 B-supergiants, obtained from STIS HST spectra as part of our programme to investigate the Wind Momentum -- Luminosity Relationship (WLR) in the Local Group. Terminal velocities are derived from their NV, CIV, and SiIV resonance lines in UV spectra. Comparing with IUE spectra of Galactic B-supergiants we found evidence of low metallicity in three of our objects. %%The terminal velocities are found to be consistent with the %%values found for Galactic stars, except for B-133. For this The terminal velocities are consistent with the corresponding values of Galactic stars, except for B-133. For this star we find a very large vterm and a red SiIV component deeper than the blue one, that might be an indication of binarity. The average ratio between terminal and turbulent wind velocities is 0.25, well above the value found for Galactic stars.

9 pages, 6 figures

References in corpus (2)

• Differential O and Si Abundances in M33 Early B Supergiants
• STIS UV spectroscopy of early B supergiants in M31

Cited by in corpus (14)

• Biases in abundance derivations for metal-rich nebulae
• Fundamental parameters of Galactic luminous OB stars VI. Temperatures, masses and WLR of Cyg OB2 supergiants
• Statistical properties of a sample of periodically variable B-type supergiants - Evidence for opacity-driven gravity-mode oscillations
• The Physical Properties and Effective Temperature Scale of O-type Stars as a Function of Metallicity. I. A Sample of 20 Stars in the Magellanic Clouds
• B-type Supergiants in the SMC: Chemical compositions and comparison of static and unified models
• The distance of M33 and the stellar population in its outskirts
• Winds of low-metallicity OB-type stars: HST-COS spectroscopy in IC1613
• Terminal velocities of luminous, early-type SMC stars
• The Stellar Content and Star Formation History of the late-type spiral galaxy NGC 300 from Hubble Space Telescope observations
• STIS UV spectroscopy of early B supergiants in M31
• Phase-resolved spectroscopic analysis of the eclipsing black hole X-ray binary M33 X-7: System properties, accretion, and evolution
• New self-consistent wind parameters fitting optical spectra of O-type stars observed with HERMES spectrograph
• Blue luminous stars in nearby galaxies - UIT005: a possible link to the luminous blue variable stage
• A machine-learning photometric classifier for massive stars in nearby galaxies II. The catalog