The amplitudes of the variations in radius of classical Cepheids

Details The amplitudes of the variations in radius of classical Cepheids The amplitudes of the variations in radius of classical Cepheids

Nov 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985ap%26ss.116...43t&link_type=abstract

Astrophysics and Space Science (ISSN 0004-640X), vol. 116, no. 1, Nov. 1985, p. 43-49.

Astronomy and Astrophysics

Astrophysics

1

Cepheid Variables, Radii, Amplitudes, Binary Stars, Least Squares Method, Stellar Magnitude, Stellar Oscillations

Scientific paper

On the basis of simultaneous accurate observations of fifteen classical cepheids with 3 < P(days) < 7 (Gieren, 1981, 1982), the linear relation between log(PΔV) and logΔR (Fernie, 1965; Nikolov and Tsvetkov, 1972) is verified (ΔR and ΔV are the amplitudes of the radius and light variations). Linear relations are also obtained between logP and logΔR, log(PΔV) and log(ΔR/R), logP and log(ΔR/R); R is the mean stellar radius. It is confirmed that the s-cepheids have smaller values of ΔR and ΔR/R than other cepheids with the same periods (ΔR/R < 0.075 for the s-cepheids). The presence of binaries among the investigated cepheids has a minor effect on the relations considered.

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