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UV and optical quantitative spectroscopy of early B-type supergiants in M 33

Published online by Cambridge University Press:  26 May 2016

Miguel A. Urbaneja ,
Artemio Herrero ,
Daniel J. Lennon ,
F. Najarro ,
Joachim Puls ,
Stephen J. Smartt  and
Rolf-Peter Kudritzki
Miguel A. Urbaneja
Affiliation:
Instituto de Astrofísica de Canarias, C/ Vía Láctea s/n, E-38200 La Laguna, Tenerife, España
Artemio Herrero
Affiliation:
Instituto de Astrofísica de Canarias, C/ Vía Láctea s/n, E-38200 La Laguna, Tenerife, España Departamento de Astrofísica, Universidad de La Laguna, Avda. Astrofísico Francisco Sánchez, s/n, E-38071 La Laguna, España
Daniel J. Lennon
Affiliation:
The Isaac Newton Group of Telescopes, Apartado de Correos 321, E-38700, Santa Cruz de La Palma, Canary Islands, España
F. Najarro
Affiliation:
Instituto de Estrucutra de la Materia, CSIC, Serrano 121, E-28006, Madrid, España
Joachim Puls
Affiliation:
Universitätssternwarte, Scheinerstraße 1, D-81679 München, BRD
Stephen J. Smartt
Affiliation:
Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 OHA, UK
Rolf-Peter Kudritzki
Affiliation:
Institute for Astronomy, University of Hawaii at Manoa, 2680 Woodlawn Drive, Honolulu, HI 96822, USA

Abstract

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We present the analysis of UV and optical spectra of M 33 early B-type supergiants. Stellar parameters, metal abundances (Si, Mg, O and N) and mass loss rates are derived from anlyses of optical spectra by means of non-LTE unblanketed unified model atmospheres (fastwind code, Santolaya-Rey, Puls & Herrero 1997). These analyses use wind terminal velocities previously derived from the analysis of UV P-Cygni profiles. Stellar radial gradients of Si, O and Mg are derived for the M 33 disk. Differential abundances of those elements with respect to Galactic counterparts are also presented, along with nitrogen. Finally, the wind momenta of M 33 stars is derived and compared with the one found for Galactic B-type supergiants.

Type
Part 1. Atmospheres of Massive Stars
Information
Symposium - International Astronomical Union , Volume 212: A Massive Star Odyssey: From Main Sequence to Supernova , 2003 , pp. 249 - 250
Copyright
Copyright © Astronomical Society of the Pacific 2003 

References

Kudritzki, R.-P., Puls, J., Lennon, D.J., et al. 1999, A&A 350, 970.Google Scholar
Santolaya-Rey, A.E., Puls, J., Herrero, A. 1997, A&A 323, 488.Google Scholar
Urbaneja, M.A., Herrero, A., Kudritzki, R.-P., et al. 2002, A&A 386, 1019.Google Scholar
Vílchez, J.M., Pagel, B.E.J., Díaz, A.I., et al. 1998, MNRAS, 135, 633.Google Scholar