Space telescope imaging spectrograph ultraviolet spectroscopy of early B supergiants in M31

F. Bresolin, R.P. Kudritzki, D.J. Lennon, Stephen Smartt, A. Herrero, M.A. Urbaneja, J. Puls

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Abstract

We analyze Space Telescope Imaging Spectrograph (STIS) spectra in the 1150-1700 Angstrom wavelength range obtained for six early B supergiants in the neighboring galaxy M31. Because of their likely high ( nearly solar) abundance, these stars were originally chosen to be directly comparable to their Galactic counterparts and represent a much needed addition to our current sample of B-type supergiants, in our efforts to study the dependence of the wind momentum-luminosity relationship on spectral type and metallicity. As a first step to determine wind momenta we fit the P Cygni profiles of the resonance lines of N V, Si IV, and C IV with standard methods and derive terminal velocities for all of the STIS targets. From these lines we also derive ionic stellar wind column densities. Our results are compared with those obtained previously in Galactic supergiants and confirm earlier claims of
Original languageEnglish
Pages (from-to)213-224
Number of pages12
JournalAstrophysical Journal
Volume580
Issue number1 I
Publication statusPublished - 20 Nov 2002

ASJC Scopus subject areas

  • Space and Planetary Science

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    Bresolin, F., Kudritzki, R. P., Lennon, D. J., Smartt, S., Herrero, A., Urbaneja, M. A., & Puls, J. (2002). Space telescope imaging spectrograph ultraviolet spectroscopy of early B supergiants in M31. Astrophysical Journal, 580(1 I), 213-224.