High Velocity Spectral Features in V854-CENTAURI - Evidence for Dust Formation

Details High Velocity Spectral Features in V854-CENTAURI - Evidence for Dust Formation High Velocity Spectral Features in V854-CENTAURI - Evidence for Dust Formation

Sep 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993mnras.264l..13c&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Vol. 264, NO.2/SEP15, P. L13, 1993

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14

Circumstellar Matter - Stars: Individual: V854 Cen - Stars: Mass-Loss - Stars: Variables: Other - Dust, Extinction - Ultraviolet: Stars

Scientific paper

Low-dispersion lUE spectra of V854 Cen show apparent shifts or splitting in the λ2325 C II], λ2800 Mg II, λ2851 Mg I and λ2965 C I lines which, if kinematic, indicate velocities in excess of 1000 km s-1. The variations are seen in all the UV emission lines simultaneously. The line splitting seems to occur at times near phase 0.0 (maximum light) of the pulsation cycle of the star. Dust formation episodes in V854 Cen also occur at this phase. New high-dispersion spectra of V854 Cen of the Na I D lines show many high-velocity features, both red- and blueshifted, including one at almost -400 km s-1. The line profile variations may be a spectral signature of the gas from which the dust is condensing.

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