HARPS observations of eight galactic Cepheids (Nardetto+, 2008)

Details HARPS observations of eight galactic Cepheids (Nardetto+, 2008) HARPS observations of eight galactic Cepheids (Nardetto+, 2008)

May 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008ycat..34891263n&link_type=abstract

VizieR On-line Data Catalog: J/A+A/489/1263. Originally published in: 2008A&A...489.1263N

Physics

Stars: Variable, Spectroscopy, Radial Velocities

Scientific paper

We show that residual gamma-velocities (compared to a axisymmetric rotation model of the milky Way) are an intrinsic property of Cepheids.
We observed eight galactic Cepheids with the HARPS spectroscope, focusing specifically on 17 spectral lines. For each spectral line of each star, we computed the gamma-velocity (resp. gamma-asymmetry) as an average value of the interpolated radial velocity (resp. line asymmetry) curve.
For each Cepheid in our sample, a linear relation is found between the gamma-velocities of the various spectral lines and their corresponding gamma-asymmetries, showing that residual gamma-velocities stem from the intrinsic properties of Cepheids. We also provide a physical reference to the stellar gamma-velocity: it should be zero when the gamma-asymmetry is zero. Following this definition, we provide very precise and physically calibrated estimates of the gamma-velocities for all stars of our sample
(2 data files).

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