Theoretical modeling of GHRS observations of the Of/WN-type star R136a5

Details Theoretical modeling of GHRS observations of the Of/WN-type star R136a5 Theoretical modeling of GHRS observations of the Of/WN-type star R136a5

Nov 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...435l..71d&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 435, no. 1, p. L71-L74

Astronomy and Astrophysics

Astrophysics

14

Astronomical Models, Ionization, O Stars, Stellar Atmospheres, Stellar Luminosity, Ultraviolet Spectra, Helium, Hubble Space Telescope, Magellanic Clouds, Temperature Profiles

Scientific paper

We present a theoretical analysis of the Hubble Space Telescope (HST) Goddard High Resolution Spectrograph (GHRS) spectrum of R136a5, an O3fWN star in the R136a cluster in 30 Doradus. Using non-LTE extended and expanding model atmospheres, we find a surprisingly high mass-loss rate dot-M = 1.8 +/- 0.5 x 10-5 solar mass/yr and an effective temperature Teff = 42.5 +/- 2.5 kK. With the observed visual magnitude, this implies a radius R* = 17 +/- 2 solar radius and a solar luminosity L = 8.5 +/- 1 x 105 solar luminosity. We discuss possible sources of the uncertainties in the derived stellar parameters and conclude that the effective temperature may be underestimated; however, if so, the value of the mass-loss rate would not be affected.

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