SIMBAD references

2005MNRAS.362.1167P - Mon. Not. R. Astron. Soc., 362, 1167-1182 (2005/October-1)

A spectroscopic study of bright southern Cepheids - a high-resolution view of Cepheid atmospheres.


Abstract (from CDS):

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 m/s. Velocity differences as large as 30 km/s were found for Hα and Caii when referenced to the metallic line velocity curves, but more subtle variations (of 1-2 km/s) 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.

Abstract Copyright: 2005 RAS

Journal keyword(s): stellar dynamics - stars: atmospheres - Cepheids

VizieR on-line data: <Available at CDS (J/MNRAS/362/1167): table1.dat tablea.dat>

Simbad objects: 16

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