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Astron. Astrophys. 322, L37-L40 (1997)

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Letter to the Editor

ROSAT detection of Class I protostars in the CrA Coronet

Ralph Neuhäuser 1 and Thomas Preibisch 2

1 Max-Planck-Institut für extraterrestrische Physik, D-85740 Garching, Germany (I: rne@hpth03.mpe-garching.mpg.de)
2 Astronomisches Institut, Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany (I: preib@astro.uni-wuerzburg.de)

Received 20 March 1997 / Accepted 28 April 1997

Abstract

We analyze archival ROSAT data of the CrA star forming region. X-ray emission from five infrared Class I protostars in the Coronet cluster was recently found in ASCA data, however, with low spatial resolution and partly ambiguous source identification. ROSAT high spatial resolution data confirm the X-ray detection of three Class I protostars. The other two infrared protostars might be extincted to strongly for being detected in the softer ROSAT bandpass. Alternatively, the X-ray emission might be strongly variable and they might have been too faint in X-rays at the time of the ROSAT observations.

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

Send offprint requests to: Ralph Neuhäuser

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© European Southern Observatory (ESO) 1997

Online publication: June 5, 1998

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