Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993adspr..13..311f&link_type=abstract
Advances in Space Research (ISSN 0273-1177), vol. 13, no. 12, p. (12)311-(12)314
Astronomy and Astrophysics
Astronomy
1
Luminosity, Size (Dimensions), Star Formation, Stellar Mass, Stellar Temperature, T Tauri Stars, X Ray Astronomy, Heao 2, Hertzsprung-Russell Diagram, Proportional Counters, Rosat Mission, X Ray Imagery
Scientific paper
Two-soft X-ray images of the Chamaeleon I star forming cloud obtained with the ROSAT Position Sensitive Proportional Counter (PSPC) are presented. Seventy reliable, and perhaps 19 additional, X-ray sources are found. Up to Ninety percent of these sources are certainly or probably identified with T Tauri stars formed in the cloud. Twenty to 35 are probably previously unrecognized 'weak' T Tauri (WTT) stars. T Tauri X-ray luminosities range from log bar-Lx less than 28.8 to 31.1 erg/s, or 102 - 104 times solar levels, with mean value of log bar-Lx = 1029.2 erg/s in the 0.2-2.5 keV band. The X-ray luminosities of well-studied Chamaeleon cloud members are correlated with a complex of four stellar properties: effective temperature, mass, radius and bolometric luminosity. The spatial distribution, Hertzsprung-Russell (H-R) diagram locations of the stars indicate WTT and CTT are coeval. The total premain sequence population of the cloud is likely to be greater than 100 stars, with WTT stars outnumbering 'classical' T Tauri (CTT) stars by approximately 2:1.
Casanova Sabrina
Feigelson Eric D.
Guibert Jean
Montmerle Th.
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