Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005mnras.362.1167p&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 362, Issue 4, pp. 1167-1182.
Astronomy and Astrophysics
Astronomy
11
Stellar Dynamics, Stars: Atmospheres, Cepheids
Scientific paper
We present high-resolution spectroscopic observations and species-by-species radial velocities of a number of southern Cepheids. The stars (BP Cir, V350 Sgr, AX Cir, V636 Sco, W Sgr, S Mus, β Dor, TT Aql, Y Oph, YZ Car, SW Vel, X Pup, T Mon and l Car) were observed as part of a long-term programme at Mt John University Observatory. Radial velocities were determined with the line bisector technique, and have a precision of ~300 ms-1. Velocity differences as large as 30 kms-1 were found for Hα and CaII when referenced to the metallic line velocity curves, but more subtle variations (of 1-2 kms-1) were also detected in many other species. Pulsational phase anticorrelations are found between lines of SiII and BaII, confirming the propagation time delay between line-forming layers producing these two species. We find that the amplitude and phase differences between the various species increase with period.
Albrow Michael D.
Cottrell Peter L.
Fokin Andrei
Petterson Orlon K. L.
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