From the Dynamics of Cepheids to the Milky Way Rotation and the Calibration of the Distance Scale

Details From the Dynamics of Cepheids to the Milky Way Rotation and the Calibration of the Distance Scale From the Dynamics of Cepheids to the Milky Way Rotation and the Calibration of the Distance Scale

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008msngr.134...20n&link_type=abstract

The Messenger, vol. 134, p. 20-24

Physics

1

Scientific paper

High precision spectroscopic measurements of ten southern Galactic Cepheid stars with the High Accuracy Radial velocity Planet Searcher (HARPS) on the 3.6 m telescope at La Silla has allowed detailed analysis of the dynamical structure of their atmospheres and close environment. The results have consequences for the calibration of the cosmic distance scale, and show that the rotation of the Milky Way is probably simpler than previously thought. However, a full understanding of the effect of spectral line asymmetries still requires the development of dedicated models.

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