Soft X-ray observations of pre-main sequence stars in the chamaeleon dark cloud

Details Soft X-ray observations of pre-main sequence stars in the chamaeleon dark cloud Soft X-ray observations of pre-main sequence stars in the chamaeleon dark cloud

Sep 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987stin...8811579f&link_type=abstract

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Physics

Heao 2, Molecular Clouds, Pre-Main Sequence Stars, Stellar Evolution, X Ray Sources, H Alpha Line, Image Processing, Line Spectra, Luminosity, Proportional Counters

Scientific paper

Einstein IPC observations of the nearby Chamaeleon I star forming cloud show 22 well-resolved soft X-ray sources in a 1x2 deg region. Twelve are associated with H-alpha emission line pre-main sequence (PMS) stars, and four with optically selected PMS stars. Several X-ray sources have two or more PMS stars in their error circles. Optical spectra were obtained at CTIO of possible stellar counterparts of the remaining X-ray sources. They reveal 5 probable new cloud members, K7-MO stars with weak or absent emission lines. These naked X-ray selected PMS stars are similar to those found in the Taurus-Auriga cloud. The spatial distributions and H-R diagrams of the X-ray and optically selected PMS stars in the cloud are very similar. Luminosity functions indicate the Chamaeleon stars are on average approximately 5 times more X-ray luminous than Pleiad dwarfs. A significant correlation between Lx and optical magnitude suggests this trend may continue within the PMS phase of stellar evolution. The relation of increasing X-ray luminosity with decreasing stellar ages is thus extended to stellar ages as young as 1 million years.

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