Soft X-ray observations of the early B giants Beta and Epsilon CMa

Details Soft X-ray observations of the early B giants Beta and Epsilon CMa Soft X-ray observations of the early B giants Beta and Epsilon CMa

Feb 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994mnras.266..917d&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 266, p. 917

Astronomy and Astrophysics

Astronomy

23

B Stars, Giant Stars, Early Stars, X Ray Astronomy, Stellar Spectra, Curve Fitting, Stellar Mass Ejection, Stellar Radiation

Scientific paper

The study reports observations performed with the PSPC on board the Roentgensatellit (ROSAT) of the two nearby giant stars Beta CMa (B1 II-III) and Epsilon CMa (B2 II). Upper limits in the region of +/- 10 percent can be set on the variation of the 0.1-0.4 keV and 0.5-2.0 keV fluxes from Beta CMa. By attributing the soft X-ray emission to an outer zone of hot shocked gas enclosing the cool inner wind responsible for observed UV blueshifted absorption features, it is estimated that the mass loss for Beta and Epsilon CMa, respectively, are (6 +/- 2) x 10 exp 9 and (8 +/- 2) x 10 exp -9 solar mass/yr.

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