Structure of the inner region of the accretion disk of the Herbig Ae star CQ Tau based on long-term monitoring data |
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Authors: | O V Kozlova D N Shakhovskoi A N Rostopchina I Yu Alekseev |
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Institution: | (1) Scientific Research Institute, Crimean Astrophysical Observatory, Crimea, Ukraine |
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Abstract: | Results from simultaneous spectral and photometric monitoring of the Herbig Ae star CQ Tau in the neighborhood of the Hα and
resonance sodium doublet Na I D lines are presented. It is shown that the inner structure of the accretion disk of CQ Tau
is nonuniform and consists of two regions with quite different kinematic characteristics. Region I is characterized by relative
stability and a smooth long-term variation in the velocity of the gas along the line of sight. Region II is distinguished
by the highest velocities and a variability in their maximum values over time scales from a few days to 700 days. The dust
clouds which produse the star’s brightness minima may also be the source of cold gas and contribute to the observed spectral
variability. We assume that region I of the disk coincides with the accretion disk of the star. The kinematic differences
in region II may be caused by dissipation of circumstellar dust clouds which, moving in elongated orbits, are able to approach
the star quite closely.
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Translated from Astrofizika, Vol. 50, No. 1, pp. 39–55 (February 2007). |
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Keywords: | stars accretion disk-individual CQ Tau |
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