HARPS observations of nine galactic Cepheids (Nardetto+, 2006)

Details HARPS observations of nine galactic Cepheids (Nardetto+, 2006) HARPS observations of nine galactic Cepheids (Nardetto+, 2006)

Aug 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007ycat..34530309n&link_type=abstract

VizieR On-line Data Catalog: J/A+A/453/309. Originally published in: 2006A&A...453..309N

Physics

Stars: Variable, Spectroscopy, Radial Velocities

Scientific paper

The ratio of pulsation to radial velocity (the projection factor) is currently limiting the accuracy of the Baade-Wesselink method, and in particular of its interferometric version recently applied to several nearby Cepheids.
This work aims at establishing a link between the line asymmetry evolution over the Cepheids' pulsation cycles and their projection factor, with the final objective to improve the accuracy of the Baade-Wesselink method for distance determinations.
We present HARPS high spectral resolution observations (R=120000) of nine galactic Cepheids: R Tra, S Cru, Y Sgr, beta Dor, zeta Gem, Y Oph, RZ Vel, l Car and RS Pup, having a good period sampling (P=3.39d to P=41.52d). We fit spectral line profiles by an asymmetric bi-Gaussian to derive radial velocity, Full-Width at Half-Maximum in the line (FWHM) and line asymmetry for all stars.
(2 data files).

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