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A New Temperature Determination for Sirius B from IUE: Implications for the Observed Soft X-Ray Fluxes
Published online by Cambridge University Press: 12 April 2016
We have used IUE archive observations to obtain a new and independent estimate of the effective temperature of Sirius B. In this effort we have modeled the observed Lyman alpha profile of Sirius B as a function of effective temperature and find; Teff = 24,500 ± 500 K. This temperature is in good agreement with a recent result obtained from analysis of EXOSAT soft X-ray spectra of Sirius B. In addition to providing confirmation of the soft X-ray result, this temperature implies that Sirius B is significantly cooler and larger in radius than most previous estimates. The radius, R = 0.090 ± 0.005 R⊙, implied by the lower temperature is well in excess of the radius of fully degenerate star having the mass of Sirius B. This investigation employed a unique set of SWP archive spectra, acquired with Sirius B in the small aperture, which have proved to be free of scattered light contamination from Sirius A.
- Research Article
- International Astronomical Union Colloquium , Volume 114: White Dwarfs , 1989 , pp. 350 - 353
- Copyright © Springer-Verlag 1989