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Astron. Astrophys. 338, 923-932 (1998)

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SVS 16: The most X-ray luminous young stellar object

Thomas Preibisch 1, Ralph Neuhäuser 2 and Thomas Stanke 3

1 Astronomisches Institut, Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany
2 Max-Planck-Institut für Extraterrestrische Physik, D-85740 Garching, Germany
3 Astrophysikalisches Institut Potsdam, An der Sternwarte 16, D-14482 Potsdam, Germany

Received 20 April 1998 / Accepted 27 July 1998


We present new infrared and X-ray data on the optically invisible infrared source SVS 16 in the NGC 1333 star forming region. We show that SVS 16 is a binary with a separation of [FORMULA]. The infrared spectrum displays photospheric atomic and CO absorption lines, and thus shows that SVS 16 is a highly obscured [FORMULA] low mass young stellar object. Our infrared data allow us to derive basic stellar parameters of SVS 16. We find that the binary system probably consists of two M-type pre-main sequence stars, which seem to be younger than a few [FORMULA].

Our new ROSAT PSPC data confirm the previous detection with the ROSAT HRI and show that SVS 16 has an extremely high quiescent X-ray luminosity of about [FORMULA] erg/sec in the 0.1 - 2.4 keV band, making it the young stellar object with the brightest quiescent X-ray emission ever detected. We discuss the origin of the strong X-ray emission.

Key words: stars: pre-main sequence – stars: binaries: visual – stars: individual: SVS 16 (NGC 1333) – infrared: stars – X-rays: stars

Send offprint requests to: Thomas Preibisch, (preib@astro.uni-wuerzburg.de)

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© European Southern Observatory (ESO) 1998

Online publication: September 17, 1998