Study of AG Carinae. I - The 1977 spectrum of the star

Details Study of AG Carinae. I - The 1977 spectrum of the star Study of AG Carinae. I - The 1977 spectrum of the star

May 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26as...73..217h&link_type=abstract

Astronomy and Astrophysics Supplement Series (ISSN 0365-0138), vol. 73, no. 2, May 1988, p. 217-224.

Astronomy and Astrophysics

Astrophysics

17

Spectral Line Width, Stellar Composition, Stellar Spectra, Variable Stars, Balmer Series, Emission Spectra, Stellar Winds

Scientific paper

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.

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