An X-ray flare observed from van Biesbroeck 8

Details An X-ray flare observed from van Biesbroeck 8 An X-ray flare observed from van Biesbroeck 8

May 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...231..131t&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 231, no. 1, May 1990, p. 131-133.

Astronomy and Astrophysics

Astrophysics

21

Emission Spectra, Stellar Flares, Stellar Luminosity, X Ray Spectra, Exosat Satellite, Flare Stars, Hydrogen, Interstellar Matter

Scientific paper

An X-ray flare was detected on the previously unknown flare-star van Biesbroeck 8 ( = Gl 644 C). The total energy of the event in the 0.05-2 keV energy range was 8 x 10 to the 31st erg/s with a mean luminosity of 1.8 x 10 to 28th erg/s. This implies an emission measure of about 6 x 10 to the 50th/cu cm, and adopting a simple loop model an electron density of 10 to the 11th/cu cm or greater. It is estimated that the flare covered 1-4 percent of the stellar surface. Quiescent X-ray emission from VB 8 was detected during an Einstein-HRI observation. These properties of VB 8 suggest that stars later than M 5 can be very active X-ray emitters.

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