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X-ray and optical bursts and flares in YSOs: results from a 5-day XMM-Newtonmonitoring campaign of L1551
- Source :
- Astronomy and Astrophysics; July 2006, Vol. 453 Issue: 1 p241-252, 12p
- Publication Year :
- 2006
-
Abstract
- We present the results of a five-day monitoring campaign with XMM-Newtonof six X-ray bright young stellar objects (YSOs) in the star-forming complex L1551 in Taurus. All stars present significant variability on the five-day time scale. Modulation of the light curve on time scales comparable with the star's rotational period appeared to be present in the case of one weak-lined T Tauri star. Significant spectral variations between the 2000 and the 2004 observations were detected in the (unresolved) classical T Tauri binary system XZ Tau: a hot plasma component which was present in the X-ray spectrum in 2000 had significantly weakened in 2004. As XZ Tau N was undergoing a strong optical outburst in 2000, which had terminated since then, we speculate on the possible relationship between episodic, burst accretion, and X-ray heating. The transition object HL Tau underwent a strong flare with a complex temperature evolution, which is indicative of an event confined within a very large magnetic structure (few stellar radii), similar to the ones found in YSOs in the Orion Nebula Cluster.
Details
- Language :
- English
- ISSN :
- 00046361 and 14320746
- Volume :
- 453
- Issue :
- 1
- Database :
- Supplemental Index
- Journal :
- Astronomy and Astrophysics
- Publication Type :
- Periodical
- Accession number :
- ejs53177071
- Full Text :
- https://doi.org/10.1051/0004-6361:20053663