High velocity outflow from η Carinae

We present new high resolution observations of the intense He I 1083 micron emission line in Eta Car, and compare with the H-alpha and P-gamma profiles. The line is characterized by a very strong emission peak, split into two components by a central absorption, and by two high velocity absorption li...

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Bibliographic Details
Published in:Astronomy and astrophysics (Berlin) 1993-02, Vol.268 (1), p.183-186
Main Authors: DAMINELI NETO, A, VIOTTI, R, BARATTA, G. B, DE ARAUJO, F. X
Format: Article
Language:English
Subjects:
Astronomy
Earth, ocean, space
Exact sciences and technology
Normal stars (by class): general or individual
Stars
Supergiant stars
Online Access:Get full text
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Summary:We present new high resolution observations of the intense He I 1083 micron emission line in Eta Car, and compare with the H-alpha and P-gamma profiles. The line is characterized by a very strong emission peak, split into two components by a central absorption, and by two high velocity absorption lines at -590 and -1040 km/s. The latter is in agreement with the general expansion rate of the circumstellar nebula, and suggests that part of the stellar wind of Eta Car is presently accelerated up to velocities similar to those of the matter ejected by the star during the bright phases of the last century. The results are discussed in the framework of the continuous mass outflow model.
ISSN:0004-6361
1432-0746