ROSAT observations of the Chamaeleon star forming cloud

E. D. Feigelson, S. Casanova, T. Montmerle, J. Guibert

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Two soft X-ray images of the Chamaeleon I star forming cloud obtained with the ROSAT Position Sensitive Proportional Counter 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 Lx < 28.8 to 31.1 erg/s, or 102 - 104 times solar levels, with mean < log 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, 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 > 100 stars, with WTT stars outnumbering 'classical' T Tauri (CTT) stars by ∼2:1.

Original languageEnglish (US)
Pages (from-to)311-314
Number of pages4
JournalAdvances in Space Research
Issue number12
StatePublished - Dec 1993

All Science Journal Classification (ASJC) codes

  • Aerospace Engineering
  • Astronomy and Astrophysics
  • Geophysics
  • Atmospheric Science
  • Space and Planetary Science
  • General Earth and Planetary Sciences


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