Abstract 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 L x < 28.8 to 31.1 erg/s , or 102 – 104 times solar levels, with mean < log L x > = 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.


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    Titel :

    ROSAT observations of the Chamaeleon star forming cloud


    Beteiligte:
    Feigelson, E.D. (Autor:in) / Casanova, S. (Autor:in) / Montmerle, T. (Autor:in) / Guibert, J. (Autor:in)

    Erschienen in:

    Advances in Space Research ; 13 , 12 ; 311-314


    Erscheinungsdatum :

    1993-01-01


    Format / Umfang :

    4 pages




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch



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