Cepheid velocity curves from lines of different excitation and ionization. I - Observations

Details Cepheid velocity curves from lines of different excitation and ionization. I - Observations Cepheid velocity curves from lines of different excitation and ionization. I - Observations

Sep 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...415..323b&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 415, no. 1, p. 323-334.

Astronomy and Astrophysics

Astrophysics

41

Absorption Spectra, Cepheid Variables, Radial Velocity, Stellar Oscillations, Velocity Distribution, Emission Spectra, Line Spectra, Stellar Motions

Scientific paper

Radial velocity curves were obtained from several hundred optical absorption lines for FF Aql, Delta Cep, Eta Aql, and Chi Cyg. An iodine absorption cell has been used to reduce relative radial velocity errors to a few hundred meters per second. The shape and amplitude of the resulting radial velocity curves are in good agreement with previous results, particularly Delta Cep, which is shown to have been extremely constant over most of the last century. Velocities from atoms in low excitation potential (EP) levels (Fe I, Fe II, Sc II, Y II, and Ti II) show positive velocity residuals of as much as 5 km/s compared to high EP Fe I lines during the phase of rapidly decreasing velocity. The 8.12 eV line of Si II at 6348 A has a negative velocity residual during the same phase. The asymmetry of the high EP Fe I, Ti II, and the Si II lines are similar and greater than the asymmetry of the low EP Fe I, Fe II, Sc II, and Y II lines.

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