On the distance and membership of the R CrA T association

Astronomy and Astrophysics – Astronomy

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Astronomical Spectroscopy, Early Stars, Molecular Clouds, Nebulae, Astronomical Catalogs, Distance, H Alpha Line, Ubv Spectra

Scientific paper

Photoelectric photometry and some spectroscopy of suspected members of the R CrA T association are presented. From uvby, beta photometry of three lightly reddened early-type stars associated with the R CrA dark cloud, a mean distance of 129 pc is derived. The confirmed late-type young stars occupy the expected band from one to three magnitudes above the main sequence in the plot of V magnitude against V I color. A red objective-prism survey has revealed seven additional stars which appear to have H alpha emission. The observations cast some doubt on the pre-main-sequence nature of some of the faint H alpha-emission stars noted by Knacke et al. (1973).

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