On the possibility of detecting companions to Cepheids and their effect on the CORS method

Details On the possibility of detecting companions to Cepheids and their effect on the CORS method On the possibility of detecting companions to Cepheids and their effect on the CORS method

Sep 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981a%26a...102...20r&link_type=abstract

Astronomy and Astrophysics, vol. 102, no. 1, Sept. 1981, p. 20-24. Research supported by the Consiglio Nazionale delle Ricerche

Astronomy and Astrophysics

Astrophysics

6

B Stars, Cepheid Variables, Companion Stars, Stellar Spectrophotometry, Phase Shift, Radii, Ubv Spectra

Scientific paper

The idea of detecting the presence of Cepheid companions from the phase-shift between the light and color curves (Fernie, 1980) has been applied to the set of observations in the VBLUW photometric system (Pel, 1976). It is shown that approximately 25 percent of the Cepheids considered have possible companions. A series of simulated binary Cepheids are analyzed, and it is found that Walraven photometry is not suitable for calibrating the phase-shift in terms of the difference of magnitude between the Cepheid and the blue companion. The simulation is extended to study the effect of unresolved companions on the Cepheid mean radius, computed by means of the CORS method (Caccin et al., 1980, 1981), and shows good results. Quantitative estimations of the B-companion from existing Walraven photometry will depend on an analysis of the properties of the color-color and s(v)-color loops (Madore, 1977).

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