Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998mnras.298..594t&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 298, Issue 2, pp. 594-600.
Astronomy and Astrophysics
Astronomy
10
Techniques: Radial Velocities, Techniques: Spectroscopic, Stars: Atmospheres, Stars: Fundamental Parameters, Stars: Individual: Beta Doradus, Cepheids
Scientific paper
A new high-accuracy velocity curve is presented for the bright southern Cepheid beta Doradus (HR 1922), and an investigation into the long-term stability of the velocity curve is made. An upper limit of 0.57 kms^-1 is placed on cycle-to-cycle variations. This work is compared with a similar analysis previously applied to the long-period Cepheid l Carinae (HR 3884). Using a near-infrared variant of the Barnes-Evans method, the mean radius of and distance to beta Dor are found to be R=67.8+/-0.7Rsolar and d=349+/-4pc. The systematic errors in these parameters are less than 3 per cent. If these systematics can be resolved, through the development of advanced theoretical models and/or the direct measurement of angular diameters, a calibration of the cosmic distance scale to better than 1 per cent can be achieved.
Booth Andrew J.
Taylor Melinda M.
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