Article (Scientific journals)
Study of AG Carinae. I - The 1977 spectrum of the star
Hutsemekers, Damien; Kohoutek, L.
1988In Astronomy and Astrophysics. Supplement Series, 73, p. 217-224
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Keywords :
SPECTRAL LINE WIDTH; STELLAR COMPOSITION; STELLAR SPECTRA; VARIABLE STARS; BALMER SERIES; EMISSION SPECTRA; STELLAR WINDS
Abstract :
[en] Spectroscopic observations of the variable P Cygni-like star AG Car have been obtained in February 1977. At this epoch, the star was in a relative minimum phase (V = 7.6) observed during a long and comparatively quiet period of intermediate brightness. The spectrum displays prominent P Cygni lines of He I, Si III, N II and Fe III. The corresponding equivalent spectral type is B2-3 Ib. The presence of an outward accelerated envelope with a multiple shell structure is confirmed. The observation of broad [Fe II] emission lines, in contrast with the absence of permitted ones, implies the presence of a low density shell expanding at about 200 km/s.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Hutsemekers, Damien ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS)
Kohoutek, L.;  Hamburger Sternwarte, Hamburg, Federal Republic of Germany
Language :
English
Title :
Study of AG Carinae. I - The 1977 spectrum of the star
Publication date :
01 May 1988
Journal title :
Astronomy and Astrophysics. Supplement Series
ISSN :
0365-0138
eISSN :
1286-4846
Publisher :
EDP Sciences, Les Ulis, France
Volume :
73
Pages :
217-224
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 09 March 2010

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