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NLTE analysis of R84

Published online by Cambridge University Press:  12 April 2016

W. Schmutz ,
C. Leitherer ,
A.V. Torres-Dodgen ,
M. Vogel ,
P.S. Conti ,
W.-R. Hamann  and
U. Wessolowski
W. Schmutz
Affiliation:
Joint Institute for Laboratory AstrophysicsUniversity of Colorado and National Bureau of StandardsBoulder, Colorado 80309-0440, USA
C. Leitherer
Affiliation:
Joint Institute for Laboratory AstrophysicsUniversity of Colorado and National Bureau of StandardsBoulder, Colorado 80309-0440, USA
A.V. Torres-Dodgen
Affiliation:
Joint Institute for Laboratory AstrophysicsUniversity of Colorado and National Bureau of StandardsBoulder, Colorado 80309-0440, USA
M. Vogel
Affiliation:
Institut für AstronomieETH Zentrum, 8092 Zurich, Switzerland
P.S. Conti
Affiliation:
Joint Institute for Laboratory AstrophysicsUniversity of Colorado and National Bureau of StandardsBoulder, Colorado 80309-0440, USA
W.-R. Hamann
Affiliation:
Institut für Theoretische Physik und SternwarteUniversität Kiel, 2300 Kiel, Germany
U. Wessolowski
Affiliation:
Institut für Theoretische Physik und SternwarteUniversität Kiel, 2300 Kiel, Germany

Extract

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The LMC star R84 (-HDE 269227 -BR 18) belongs to the group of Ofpe/WN stars believed to be closely related to the Luminous Blue Variables. Support for such a relation comes from the spectral resemblance of these stars to AG Car during visual minimum, and from the observed outburst of the Ofpe/WN star R127.

The spectral analysis of R84 presented here is based on model calculations with the NLTE comoving-frame code described by Wessolowski et al. (1988) and references therein. The helium model atom was represented by 28 levels and hydrogen by 9 levels. The free model parameters were varied until the observed line profiles and the absolutely calibrated and dereddened continuum flux were reproduced. The comparison of the theoretical continuum flux distribution with the observed one yields a reddening of EB-V =0.1.

Type
Section II: Poster Papers, A Brief List of Catalogs, and Index
Information
International Astronomical Union Colloquium , Volume 113: Physics of Luminous Blue Variables , 1989 , pp. 289 - 290
Copyright
Copyright © Kluwer 1989

References

Maeder, A., Meynet, G.: 1987, Astron. Astrophys. 182, 243 Google Scholar
Stahl, O., Wolf, B., de Groot, M., Leitherer, C.: 1985, Astron. Astrophys. Suppl. 61, 237 Google Scholar
Wessolowski, U., Schmutz, W., Hamann, W.-R.: 1988, A. & A. 194, 160 Google Scholar