A Star is Born: X-ray Imaging of the Onset of an FU Ori Outburst

Details A Star is Born: X-ray Imaging of the Onset of an FU Ori Outburst A Star is Born: X-ray Imaging of the Onset of an FU Ori Outburst

Sep 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003cxo..prop.1621k&link_type=abstract

Chandra Proposal ID #05208171

Physics

Chandra Proposal Id #05208171

Scientific paper

The highest accretion rates among low-mass stars are associated with the FU Ori (FUor) phase. This phase is marked by ~100-yr-long outbursts during which a star brightens by 5-15 magnitudes and its mass accretion rate likely increases by up to a factor of 10^4. The 'standard model' for the formation of Sunlike stars is that they go through one or more FUor epochs during their pre-main sequence evolution, and that this phase(s) is when such stars gain most of their mass. We propose to observe a newly identified FUor during the rarely observed rise phase of its outburst. This almost certainly will be the only chance for CXO to make observations of this evolutionary phase. These observations will be essential in understanding and improving models for the formation of all low mass stars, and to inform the ongoing debate concerning the origin of X-rays from young, low-mass stars (e.g. Kastner et al 2002, ApJ 567, 434).

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