Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998mnras.293...18g&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 293, p. 18
Astronomy and Astrophysics
Astronomy
80
Mira Variables, Carbon Stars, Light Curve, Stellar Envelopes, Cosmic Dust, Stellar Mass Ejection, Optical Thickness, Asymptotic Giant Branch Stars, Stellar Color, Radial Velocity
Scientific paper
The spectral energy distributions and mid-IR spectra of 44 carbon Mira variables are fitted using a dust radiative transfer model. The pulsation periods of these stars cover the entire range observed for carbon Miras. The luminosities are derived from a period-luminosity relation. Parameters derived are the distance, the temperature of the dust at the inner radius, the dust mass-loss rate, and the ratio of silicon carbide to amorphous carbon dust. The total mass-loss rate is derived from a modified relation between the photon momentum transfer rate and the momentum transfer rate of the wind. Mass-loss rates between 1 x 10 exp -8 and 4 x 10 exp -5 solar mass/yr are found. We find good correlations between mass-loss rate and pulsation period, and between mass-loss rate and luminosity. The dust-to-gas ratio appears to be almost constant up to periods of about 500 d, corresponding to about 7900 solar luminosities, and then to increase by a factor of 5 towards longer periods and higher luminosities. A comparison is made with radiation-hydrodynamical calculations including dust formation.
Groenewegen Martin A. T.
Kerschbaum Florian
Smith Cotton H.
Whitelock Patricia A.
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