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Astron. Astrophys. 338, L25-L28 (1998)

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Letter to the Editor

Super-strong X-ray emission from a deeply embedded young stellar object in the Serpens cloud core

Thomas Preibisch

Astronomisches Institut, Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany

Received 21 July 1998 / Accepted 7 August 1998


We report the ROSAT detection of strong X-ray emission from an optically invisible infrared source in the Serpens star forming region. The X-ray source can be identified with the infrared star EC 95, a deeply embedded ([FORMULA] mag) young stellar object. The quiescent soft X-ray luminosity of this object is about [FORMULA] erg/sec, making it the most X-ray luminous young stellar object ever detected. Since this exceeds the quiescent, i.e. non-flaring, X-ray luminosity of any known coronal X-ray source by at least about one order of magnitude, our result suggests that a non-solar-like origin for the X-ray emission of EC 95 has to be considered.

Key words: Stars: formation, pre-main sequence, coronae – X-rays: stars

Send offprint requests to: T. Preibisch
(e-mail: preib@astro.uni-wuerzburg.de)

© European Southern Observatory (ESO) 1998

Online publication: September 8, 1998