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

Bibcode
2003IAUS..212..249U
Urbaneja, M. A.; Herrero, A.; Lennon, Daniel J.; Najarro, F.; Puls, Joachim; Smartt, Stephen J.; Kudritzki, Rolf-Peter
Bibliographical reference

A Massive Star Odyssey: From Main Sequence to Supernova, Proceedings of IAU Symposium #212, held 24-28 June 2001 in Lanzarote, Canary island, Spain. Edited by Karel van der Hucht, Artemio Herrero, and Esteban, César. San Francisco: Astronomical Society of the Pacific, 2003., p.249

Advertised on:
2003
Number of authors
7
IAC number of authors
2
Citations
0
Refereed citations
0
Description
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
Non-refereed

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