Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aipc..393..179f&link_type=abstract
The seventh astrophysical conference: Star formation, near and far. AIP Conference Proceedings, Volume 393, pp. 179-183 (1997).
Astronomy and Astrophysics
Astrophysics
Pre-Main Sequence Objects, Young Stellar Objects And Protostars, X-Ray, Star Formation, Circumstellar Shells, Clouds, And Expanding Envelopes, Circumstellar Masers, Stellar Activity
Scientific paper
Strong and flaring X-ray emission, 2-5 orders of magnitude above main sequence levels, is well-established for low-mass T Tauri stars (ages 106-107 yr). This has been attributed to enhanced solar-type magnetic activity. We summarize here recent reports for X-ray emission from earlier phases of star formation, corresponding to Class I/II (ages ~105 yr) and Class I (ages ~104-105 yr) infrared sources. These include XZ Tau in the Taurus L1551 cloud, the Coronet Cluster of infrared sources in the R Corona Australis cloud, and IRS 43 in the Ophiuchi cloud core. Data are obtained from the PSPC and HRI detectors on ROSAT, and the SIS and GIS detectors on ASCA. Two of the sources, R1 in CrA and IRS 43 in Oph, exhibited powerful flares during the observations. The presence of X-rays in protostars may involve non-solar-type magnetic flaring events involving the circumstellar disk. Protostellar X-rays should have a significant effect on circumstellar material, such as producing ionization for magnetic coupling of disks and outflows, and promoting disk accretion through photoionization.
Feigelson Eric D.
Koyama Katsuji
Montmerle Thierry
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