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Astron. Astrophys. 322, L37-L40 (1997)
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
Contents
- 1. Introduction
- 2. ROSAT observations
- 3. Notes on individual sources
- 4. X-ray Variability
- 5. Discussion
- Acknowledgements
- References
© European Southern Observatory (ESO) 1997
Online publication: June 5, 1998
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