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

Astronomy and Astrophysics – Astrophysics

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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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