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2002ApJ...574..258F - Astrophys. J., 574, 258-292 (2002/July-3)
X-ray-emitting young stars in the Orion nebula.
FEIGELSON E.D., BROOS P., GAFFNEY III J.A., GARMIRE G., HILLENBRAND L.A., PRAVDO S.H., TOWNSLEY L. and TSUBOI Y.
Abstract (from CDS):
We examine here the X-ray properties of Orion young stars as a function of mass; other studies of astrophysical interest will appear in companion papers.
Result. include: (a) the discovery of rapid variability in the O9.5 31 M☉ star θ2A Ori, and several early B stars, inconsistent with the standard model of X-ray production in small shocks distributed throughout the radiatively accelerated wind; (b) support for the hypothesis that intermediate-mass mid-B through A type stars do not themselves produce significant X-ray emission; (c) confirmation that low-mass G through M type T Tauri stars exhibit powerful flaring but typically at luminosities considerably below the ``saturation'' level; (d) confirmation that the presence or absence of a circumstellar disk has no discernable effect on X-ray emission; (e) evidence that T Tauri plasma temperatures are often very high with T≥100 MK, even when luminosities are modest and flaring is not evident; and (f) detection of the largest sample of pre-main-sequence very low-mass objects showing flaring levels similar to those seen in more massive T Tauri stars and a decline in magnetic activity as they evolve into L and T type brown dwarfs.
Abstract Copyright: ∼
Journal keyword(s): Galaxy: Open Clusters and Associations: Individual: Name: Orion Nebula Cluster - Stars: Activity - Stars: Early-Type - Stars: Low-Mass, Brown Dwarfs - Stars: Pre-Main-Sequence - X-Rays: Stars
VizieR on-line data: <Available at CDS (J/ApJ/574/258): table2.dat notes2.dat table3.dat notes3.dat table4.dat table5.dat table6.dat>
Nomenclature: Table 2: [FBG2002] NNNN (Nos 1-1075) = CXOONC JHHMMSS.s+DDMMSS N=1075.
Simbad objects: 1124
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