Gamma velocities of 58 faint Milky Way Cepheids

Details Gamma velocities of 58 faint Milky Way Cepheids Gamma velocities of 58 faint Milky Way Cepheids

Feb 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aj....103..529m&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 103, Feb. 1992, p. 529-537.

Astronomy and Astrophysics

Astronomy

24

Cepheid Variables, Galactic Rotation, Radial Velocity, Data Reduction, Echelle Gratings, Milky Way Galaxy, Southern Sky

Scientific paper

Using new radial velocity measurements of 47 faint southern hemisphere Galactic Cepheids, together with additional velocity data from Metzger et al. (1991), gamma velocities are found for 58 low galactic latitude Cepheids. The gamma velocity is determined by using the period of a Cepheid to generate a 'typical' velocity curve, then fitting the curve to the velocity measurements using two free parameters, the gamma velocity, and the phase. The velocity curve is generated using a second order Fourier series with coefficients determined from the period. For the Cepheids with observations that sample the velocity curve over a variety of pulsation phases, gamma velocities are determined to better than 1.0 km/s. Good agreement between these gamma velocities and previously published values where they exist.

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