EDP Sciences
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Volume 415, Number 1, February III 2004
Page(s) 265 - 272
Section Stellar structure and evolution
DOI http://dx.doi.org/10.1051/0004-6361:20034378

A&A 415, 265-272 (2004)
DOI: 10.1051/0004-6361:20034378

A new strongly X-ray flaring M 9 dwarf in the solar neighborhood

V. Hambaryan1, A. Staude1, A. D. Schwope1, R.-D. Scholz1, S. Kimeswenger2 and R. Neuhäuser3, 4

1  Astrophysikalisches Institut Potsdam, An der Sternwarte 16, 14482 Potsdam, Germany
2  Institut für Astrophysik der Universität Innsbruck, Technikerstr. 25, 6020 Innsbruck, Austria
3  MPI für extraterrestrische Physik, Gissenbachstrasse 1, 85740 Garching, Germany
4  Astrophysikalisches Institut, Universität Jena, Schillergässchen 2-3, 07745 Jena, Germany

(Received 23 September 2003 / Accepted 7 October 2003)

We report on the discovery of a very low mass (VLM) star in the solar neighborhood, originally identified as an optical counterpart of a flaring X-ray source detected in the ROSAT All-Sky survey. Optical spectroscopy and infrared photometry consistently reveal a spectral type of $\rm M\,9\, \pm\, 0.5$ and a distance of $\approx$ $11\,\pm\,2$ pc. The optical counterpart of 1RXS J115928.5-524717 shows a large proper motion of  $1.08\,\pm\,0.06\arcsec$/year. 1RXS J115928.5-524717 is the fourth object among the VLM stars displaying a huge X-ray flare, reaching the unprecedent value of $L_X/L_{\rm
bol}\simeq 0.1$ .

Key words: methods: data analysis -- X-rays: stars -- stars: low-mass, brown dwarfs -- stars: distances -- stars: flare -- stars: individual: 1RXS J115928.5-524717

Offprint request: V. Hambaryan, vhambaryan@aip.de

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