The effect of an expanding dust cloud on radial velocity measurements

Details The effect of an expanding dust cloud on radial velocity measurements The effect of an expanding dust cloud on radial velocity measurements

Oct 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...225..482v&link_type=abstract

Astrophysical Journal, Part 1, vol. 225, Oct. 15, 1978, p. 482-487.

Statistics

Computation

23

Cosmic Dust, Interstellar Masers, Radial Velocity, Stellar Envelopes, Supergiant Stars, Velocity Measurement, Absorption Spectra, Electromagnetic Scattering, Hydroxyl Emission, Monte Carlo Method, Photosphere, Stellar Spectra

Scientific paper

Radial velocities of 'supergiant' maser sources, such as VY CMa, do not always agree with what would be expected if the maser emission originates in an expanding spherical shell. It has been proposed that the photospheric absorption lines are shifted to the red by scattering off dust grains in the shell. A Monte Carlo computation of this process is performed. The results strongly support the scattering hypothesis, although the question of how the redshift can disappear in only a few years is bothersome. In particular, it is shown that if the spectrum of Alpha Her is passed through an expanding dust shell, the emergent spectrum is remarkably close to that of VY CMa.

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