Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...250..407l&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 250, no. 2, Oct. 1991, p. 407-419.
Astronomy and Astrophysics
Astronomy
73
Binary Stars, Infrared Astronomy, Lunar Occultation, Pre-Main Sequence Stars, Speckle Interferometry, Near Infrared Radiation, Star Formation, Stellar Envelopes, Taurus Constellation
Scientific paper
Results are presented of near-infrared lunar occultation observations at 2.2 microns. It is demonstrated that DG Tau has a 'shell' with a diameter of 6.8 AU (FWHM). A 1D projected image of this circumstellar structure is reconstructed. Follow-up near-infrared speckle observations show a halo with a diameter of 130 AU, which is probably the outward extension of the inner 'shell'. Our speckle measurements also show both GG Tau and its nearby companion GG Tau/c to be double, possibly forming a hierarchical quadruple system. The duplicity of FV Tau and FW Tau found in previous lunar occultation observations by Chen et al. (1990) is confirmed. The projected positions of the companions of FV Tau and FW Tau are determined. No duplicity or extended components were detected in the cases of DL Tau, GU Tau, and IRAS 04212 + 2610.
Haas Marcel
Leinert Ch.
Mundt Reinhard
Richichi Andrea
Zinnecker Hans
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