Apparent radii and other parameters for 416 B5 V-F5 V stars of the catalogue of the Geneva Observatory

Details Apparent radii and other parameters for 416 B5 V-F5 V stars of the catalogue of the Geneva Observatory Apparent radii and other parameters for 416 B5 V-F5 V stars of the catalogue of the Geneva Observatory

May 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980ap%26ss..69..401f&link_type=abstract

Astrophysics and Space Science, vol. 69, no. 2, May 1980, p. 401-423. Consiglio Nazionale delle Ricerche

Astronomy and Astrophysics

Astrophysics

4

Binary Stars, Hot Stars, Radii, Stellar Spectra, Dimensional Measurement, Hertzsprung-Russell Diagram, Metallic Stars, Size Determination, Stellar Spectrophotometry, Stellar Temperature, Visual Observation

Scientific paper

Apparent radius, visual brightness, effective temperature and absolute radius for 416 B5 v-F5 v stars of the catalogue of the Geneva Observatory (Rufener, 1976) have been determined. Twenty-eight stars, anomalous in log a" versus (m~)o diagrams, have been singled out. A good correlation for seven stars, in common with the list of Hanbury Brown et al. (1974), has been found. Similar parameters determined for 279 B5 v-F5 v stars of two preceding papers (Fracassini et al., 1973, 1975) have allowed us to determine the averaged diagrams , and versus (B - V)0 for 695 B5 v-F5 v stars. Moreover, in the present paper a good correlation versus and careful relation = -7.40 + 3.31 for B5 v-F5 V stars have been determined. Plain correlations between log R/R0 and blanketing parameter m2 for some spectral types seem to point out that there are real differences in the absolute radii of stars of the same spectral type, in agreement with recent researches on the HR diagram (Houck and Fesen, 1978). Systematic differences between double (spectroscopic and visual) and single stars are found. In particular, the averaged relation versus shows that A2 v-F5 v double stars may have a higher metallicity index m2 and smaller absolute radii than single stars. Finally, the diagram log v sin i versus log R/R0 confirms some properties of binary systems found by other researchers (Huang, 1966; Plavec, 1970; Levato, 1974; Kitamura and Kondo, 1978)

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