The bright southern Cepheid L Carinae - The radial velocity curve, distance and size

Details The bright southern Cepheid L Carinae - The radial velocity curve, distance and size The bright southern Cepheid L Carinae - The radial velocity curve, distance and size

Dec 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997mnras.292..662t&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 292, p. 662

Astronomy and Astrophysics

Astronomy

15

Cepheid Variables, Radial Velocity, Stellar Magnitude, Periodic Variations, Stellar Spectra, Visible Spectrum, Very Long Base Interferometry, High Resolution, Solar Diameter

Scientific paper

Using 137 high-resolution optical spectra from Mount John University Observatory and Mount Stromlo Observatory, a new, high-accuracy, radial velocity curve for the bright southern Cepheid l Carinae (HR 3884) is presented. We investigate recent period variations in l Carinae, cycle-to-cycle and long-term variations in the velocity curve, and the reliability of the combination of velocity data from different observatories. Such information should help to secure Cepheid distance scale calibrations, such as long-baseline interferometry and the Baade-Wesselink method, which depend on the accuracy of radial velocity data. A Barnes-Evans analysis is used to determine the radius of and distance to this Cepheid. The radius is found to be R = 179.2 +/- 2.7 +/- 10 solar radii, and the distance d = 571.1 +/- 8.5 +/- 21 pc. We highlight some of the problems involved with such distance techniques when applied to long-period Cepheids.

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