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CLUMPY ACCRETION ONTO PRE-MAIN SEQUENCE STARS

© 1992. The Astronomical Society of the Pacific. All rights reserved. Printed in U.S.A.
, , Citation J. A. Graham 1992 PASP 104 479 DOI 10.1086/133021

1538-3873/104/677/479

ABSTRACT

Medium resolution spectroscopic observations covering the range 5150A - 9100A have been made of 5 pre-main sequence stars in the Corona Australis star forming region. They are known variable stars R CrA, S CrA, T CrA, TY CrA, VV CrA. During the period of observation, 1990 September 3-10, significant changes, sometimes occurring between successive nights, were observed in the spectra of R CrA and S CrA. They are interpreted as being due to variable accretion onto the star. Velocities have been measured and confirm that we do not see the photosphere of R CrA in this region of the spectrum. Photospheric absorption lines are observed in S CrA, T CrA, and TY CrA. In VV CrA only Li I-lambda-6708 is detected. The velocity variation of TY CrA is demonstrated. An infrared (J: 1.2 microns) image of VV CrA is reproduced which shows the infrared companion 1.9" NE of the primary star.

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10.1086/133021