Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993astl...19..131b&link_type=abstract
Astronomy Letters, Vol. 19, p. 131-135; Pis'ma v Astronomicheskij Zhurnal (ISSN 0320-0108), vol. 19, no. 4, p. 348-358. In Russ
Astronomy and Astrophysics
Astronomy
Infrared Astronomy, Lunar Occultation, Stellar Structure, T Tauri Stars, Brightness Distribution, Limb Darkening
Scientific paper
Near-IR lunar occultation observations of the T Tauri star DG Tau performed with the 3.5-m Calar Alto telescope are examined. Consideration is given to two models of the brightness distribution across the stellar disk: a model with linear limb-darkening for a plane-parallel atmosphere and a model with monotonic darkening for a spherically symmetric extended atmosphere. The strip brightness distribution, retrieved by the model-independent regularization method with a nonnegative restriction, demonstrates that DG Tau has a bright central component with a size of 0.26 AU (FWHM) and an extended shell, observed up to 3 AU from the star center.
Bogdanov Mikhail B.
Cherepashchuk Anatol M.
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