A New Approach For DACs And SACs Phenomena In The Atmospheres Of Hot Emission Stars

Details A New Approach For DACs And SACs Phenomena In The Atmospheres Of Hot Emission Stars A New Approach For DACs And SACs Phenomena In The Atmospheres Of Hot Emission Stars

Jul 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007uasb.conf..107n&link_type=abstract

UV Astronomy: Stars from Birth to Death. Proceedings of the Joint Discussion n.4 during the IAU general Assembly of 2006. Ana I.

Astronomy and Astrophysics

Astronomy

Uv Astronomy, Hot Emission Stars, Dacs, Sacs

Scientific paper

DACs and SACs phenomena in Hot Emission Stars. In this paper we present a mathematical model reproducing the complex profile of the spectral lines of Oe and Be stars that present DACs or SACs. This model presupposes that the regions, where these spectral lines are formed, are not continuous but consist of a number of independent absorbing or emitting density layers of matter and an external general absorption region. In this model we assume that the line broadening is due to the random motion of the ions and the rotation of the density regions that produce the spectral line and its satellite components. With this method we can calculate the values of the apparent rotational and radial velocities, the Gaussian standard deviation of the random motions of the ions, the random velocities of these motions, as well as the optical depth, the FullWidth at Half Maximum (FWHM), the absorbed and the emitted energy and finally the column density of the independent regions of matter which produce the main and the satellites components of the studied spectral lines.

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