Non-LTE models of accretion disks of UX Ori type stars.

Astronomy and Astrophysics – Astronomy

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Circumstellar Disks: Variables, Circumstellar Disks: Magnetic Fields, Circumstellar Disks: Non-Lte Models

Scientific paper

The mass accretion rate has been estimated; it ranges from M˙α = 10-8 to 10-9Msunyr-1. The gas temperature in this region is about 10000 K. In the close vicinity of the star there exists the hotter region with the temperature of more than 15000 K where the line of the neutral helium 5876 Å observed in the spectra of these stars arises. This region has a small geometrical depth, covers a small part of the visible stellar disk and, apparently, represents places where accreting gas contacts the star. Low values of the rotation velocity in this region (150 - 200 km/s) implies the presence of the magnetic field strong enough to extinguish the rapid rotation of the stream. The magnetic strength in this region is about 150 Gs.

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