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Title:
Einstein Observations of T Tauri Stars in Taurus-Auriga. I. Properties of X-Ray Emission
Authors:
Damiani, F.; Micela, G.; Sciortino, S.; Harnden, F. R., Jr.
Publication:
Astrophysical Journal v.446, p.331 (ApJ Homepage)
Publication Date:
06/1995
Origin:
APJ; KNUDSEN
ApJ Keywords:
STARS: ACTIVITY, STARS: PRE-MAIN-SEQUENCE, X-RAYS: STARS
DOI:
10.1086/175791
Bibliographic Code:
1995ApJ...446..331D

Abstract

We present a systematic reanalysis of the Einstein IPC X-ray data on the pre-main-sequence stars in the Taurus-Auriga star formation region. We consider all cataloged stars in this region which have been observed with the IPC; of these, 52 out of 68 can be identified with X-ray sources; upper limits on the X-ray luminosity have been evaluated in the remaining cases. We derive an X-ray luminosity function and argue that its median Lx is representative of the population intrinsic value, in spite of incompleteness of the sample and possible ambiguities in the X-ray source identifications. As a result, it is confirmed that the known steady increase in the average level of X-ray emission toward younger ages can be extended to the pre-main-sequence phase. By using the line equivalent width as the relevant parameter, a statistically significant difference is found between the distributions of X-ray luminosities of stars with and without strong emission lines. No such difference is found instead between stars with and without strong infrared excess at 25 μm.

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