Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...279..477g&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 279, no. 2, p. 477-484
Astronomy and Astrophysics
Astronomy
12
Cosmic Dust, Emission Spectra, Light Emission, Line Spectra, Molecular Spectra, Stellar Envelopes, Stellar Models, T Tauri Stars, Ultraviolet Spectra, Carbon Monoxide, Mathematical Models, Stellar Spectrophotometry, Ultraviolet Astronomy
Scientific paper
The T Tauri star RY Lupi was followed simultaneously spectroscopically and photometrically over 7 nights covering one of its deepest brightness minima ever recorded. As reported earlier the star first becomes redder with decreasing brightness. At V = 12.5 this trend is changed towards the blue and this time the object was as blue as in maximum at the deepest minimum. The spectral type (G8) remains constant over the entire range of 3 mag in V. During the deep minimum, when the star brightened from V = 13.12 to V = 12.45, the line-to-continuum ratios and equivalent widths of absorption features in the U- and B-bands did not change with time. We show that the additional light component, present when the star is heavily occulted by circumstellar dust, can not be due to an emission component that either is produced at low brightness levels or is always present. Instead it is due to stellar radiation scattered into the line-of-sight by dust in the immediate surrounding of the star. We test this result by assuming that the scattering occurs in a circumstellar disk which is inclined so that the line-of-sight passes its fluffy upper layers with variable degree of foreground circumstellar dust. We also discuss the behavior of the emission lines, which most likely form in a halo/wind, not occulted much by circumstellar dust. Complementary Far-UV data and one CO-observation are discussed and future tests of the model are proposed.
Gahm Goesta F.
Gullbring Erik
Hartstein Daniel
Liseau Rene
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