Synthetic spectra of A supergiants

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Authors	KORČÁKOVÁ Daniela KUBÁT Jiří KRTIČKA Jiří ŠLECHTA Miroslav
Year of publication	2005
Type	Article in Proceedings
Conference	Proceedings of the IAUS224: The A-Star Puzzle
MU Faculty or unit	Faculty of Science
Citation
Web	http://journals.cambridge.org/bin/bladerunner?REQUNIQ=1109866025&REQSESS=2521642&118000REQEVENT=&REQINT1=280732&REQAUTH=0
Field	Astronomy and astrophysics
Keywords	hydrodynamics; line: profiles; radiative transfer; (stars:) supergiants; stars: individual (HD 12953
Description	The stellar winds of A supergiants can have a significant influence on their emergent spectra. Here we present the hydrogen line profiles of a model based on the stellar parameters of HD 12953. The radiative transfer equation is solved in two dimensions in axial symmetry. We do not include the velocity field by the Sobolev approximation, but in detail using the Lorentz transformation. This allows us to correctly include the stellar wind, since the velocity gradients in A supergiants are too small for the Sobolev approximation to be valid.
Related projects:	Physics of hot stars and stellar systems with hot components Hydrodynamics of stellar wind of hot stars Circumstellar envelopes of hot stars