Other
Scientific paper
Dec 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992mnras.259..474w&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 259, no. 3, p. 474-488.
Other
40
Cepheid Variables, H Alpha Line, Line Spectra, Radial Velocity, Stellar Atmospheres, Stellar Spectrophotometry, Optical Thickness, Stellar Spectra
Scientific paper
New metallic-line and H-alpha velocity curves have been produced for seven southern Cepheids. A comprehensive comparison is made between these data and those of previous observers and also with other Cepheids having similar periods. Use is made of the line bisector method to derive the velocity information and also to investigate asymmetries in the H-alpha lines. These bisectors provide a consistent approach to the analysis of spectroscopic data of Cepheids and will enable more quantitative studies of the structure of Cepheid atmospheres. This will in turn enable more reliable radii and hence distances to be deduced and a better use of Cepheids to establish the distances to nearby galaxies.
Albrow Michael
Clark Michael
Cottrell Peter L.
Jacobsen Theodor S.
Wallerstein George
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