...TrA

Based on observations made with the NASA/ESA Hubble Space Telescope, obtained at the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contractNAS 5-26555.

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... photosphere

The observed width of these lines corresponds to velocities of a few hundred $\rm km\,s^{-1}$. If these lines had an origin in the accretion disk, they would form in regions that are hot enough to populate Si II - i.e. in the inner disk -, where the Keplerian velocities are higher.

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