The velocity field in the atmosphere of Delta Cephei

Details The velocity field in the atmosphere of Delta Cephei The velocity field in the atmosphere of Delta Cephei

Nov 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978ap%26ss..59..165d&link_type=abstract

Astrophysics and Space Science, vol. 59, no. 1, Nov. 1978, p. 165-170.

Astronomy and Astrophysics

Astrophysics

6

Cepheid Variables, Stellar Atmospheres, Velocity Distribution, Photosphere, Stellar Spectrophotometry

Scientific paper

Observations related to the photospheric velocity field of Delta Cephei can be interpreted as follows: during the whole cycle of pulsations the only motion form in the atmosphere is a wave motion with a nearly constant full amplitude of approximately 15 km/s, and a wavelength of about 1,000,000 km (which are quantities about equal to the amplitudes of pulsational velocity and radius of the star). There are no significant small-scale 'turbulent' velocity components. The 'microturbulent' and 'macroturbulent' velocities, as derived from spectral line observations' are fully compatible with this picture.

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