X-rays from protostars

Details X-rays from protostars X-rays from protostars

Jan 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999nuphs..69...52m&link_type=abstract

Nuclear Physics B Proceedings Supplements, Volume 69, Issue 1-3, p. 52-55.

Physics

Nuclear Physics

Scientific paper

Very recently, ROSAT and ASCA have been able to detect X-rays from protostars typically 10 times younger than T Tauri stars (i.e., having ages ~105 yrs), in spite of their heavy extinction (Aν~30-60). The intrinsic luminosities, either quiescent or in the form of flares, are ~10 times higher than T Tauri stars or more. In one particular case (a well-documented protostar in the nearby ρ Oph cloud, YLW15), the Lx/Lbol ratio has been >1 during a ``superflare''. This high value implies not a stellar origin, but rather (for the first time) star-disk and/or star-envelope magnetic interactions, not unlike those invoked for compact objects. The present status of X-ray emission by protostars, as seen with ROSAT and ASCA, is summarized.

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