Other
Scientific paper
Feb 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...385..694b&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 385, Feb. 1, 1992, p. 694-707.
Other
17
Asymptotic Giant Branch Stars, Carbon Monoxide, Carbon Stars, Radial Velocity, Stellar Mass Ejection, Visible Spectrum, Center Of Mass, Emission Spectra, Line Spectra, Solar Neighborhood
Scientific paper
Measurements of the optical radial velocities of 34 optically bright carbon stars in the solar neighborhood are compared with the velocities of circumstellar CO radio emission lines taken from the literature. Twelve stars of the 34 show a large offset, greater than 5 km/s, between the CO and optical velocities. This group distinguishes itself by several characteristics: IRAS and 2-micron colors, variability class (most are Miras), large amplitude of optical velocity variation over several epochs, strong H-alpha emission, and relatively large mean outflow velocity of the circumstellar matter. The optical velocities for this group are consistently redshifted from the CO mean, whereas the optical velocities for the other carbon stars are distributed on either side of their mean CO velocity. It is argued that this redshift bias in optical velocity is related to the shock structure or pulsational mode of these stars. A mean amplitude of optical velocity variation of 8.0 km/s and 2.4 km/s for the Mira and SR variables, respectively, is reported.
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