Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981pasp...93..594r&link_type=abstract
Astronomical Society of the Pacific, Publications, vol. 93, Oct.-Nov. 1981, p. 594-600.
Astronomy and Astrophysics
Astronomy
6
Early Stars, Emission Spectra, Radial Velocity, Stellar Envelopes, Stellar Spectra, Absorption Spectra, Abundance, Angular Velocity, H Alpha Line, Magnesium, Orbital Velocity, Shell Stars, Stellar Temperature
Scientific paper
Spectrographic observations of the early-type shell star V923 Aquilae are presented. The observations were made at Cerro Tololo Inter-American Observatory in July 1980, when the shell was apparently entering the positive velocity phase of a cyclic V/R variable. The stellar spectrum of the object confirms its previous classification as B5, and indicates an effective temperature of about 15,000 K, log g of 4 and rotational velocity between 275 and 300 km/sec. The shell spectrum displays three absorption components in H lines, two of which have mean radial velocities of -35.9 and -20.2 km/sec, metallic lines identified with Mg I, Cr II, Ti II, Ni II, Mn II and Fe II associated with radial velocities of about 40, -15 and -20 km/sec, and Na I and Ca II lines with components at radial velocities to the blue of -20 km/sec. The only prominent emission is identified with H-alpha, which appears as the superimposition of two emission profiles. The three absorption components are interpreted as expanding shell regions, while the region of H-alpha emissions must be different from the absorption regions. Simultaneous ultraviolet and photographic observations are required to more fully understand the envelope structure.
Ringuelet Adela E.
Sahade Jorge
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