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FUSE observations of Luminous Blue Variables

Published online by Cambridge University Press:  26 May 2016

Rosina C. Iping ,
George Sonneborn  and
Derck L. Massa
Rosina C. Iping
Affiliation:
Department of Physics, Catholic University of America, Washington DC 20064, USA Laboratory for Astronomy and Solar Physics, NASA Goddard Space Flight Center, Code 681.0, Greenbelt, MD 20771, USA
George Sonneborn
Affiliation:
Laboratory for Astronomy and Solar Physics, NASA Goddard Space Flight Center, Code 681.0, Greenbelt, MD 20771, USA
Derck L. Massa
Affiliation:
Laboratory for Astronomy and Solar Physics, NASA Goddard Space Flight Center, Code 681.0, Greenbelt, MD 20771, USA Stinger and Ghaffarian Technologies, Inc., 7701 Greenbelt Road, Suite 400, Greenbelt, MD 20770, USA

Abstract

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P Cyg, AG Car, HD 5980 and η Car were observed with the Far Ultraviolet Spectroscopic Explorer (FUSE) satellite. FUSE covers the spectral range from 980 Å to 1187 Å at a resolution of 0.05 Å. In this paper we discuss the far-UV properties of these LBVs and explore their similarities and differences. The FUSE observations of P Cyg and AG Car, both spectral type B2pe, are very similar. The atmospheres of both η Car and HD 5980 appear to be somewhat hotter and have much higher ionization stages (Si iv, S iv, and P v) in the FUSE spectrum than P Cyg and AG Car. There is a very good agreement between the FUSE spectrum of P Cygni and the model atmosphere computed by John Hillier with his code cmfgen. The FUSE spectrum of η Car, however, does not agree very well with existing model spectra.

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. 208 - 209
Copyright
Copyright © Astronomical Society of the Pacific 2003