VZ CVn: a close binary system with γ Doradus-like variations
We present new photometric two-colour observations of the double-linedclose binary star VZ CVn. Combining two data sets obtained in 1971-72and in 2006, the physical parameters of both components were derived.After removing the light variations due to the eclipses and proximityeffects, a periodic variation in the more massive component with adominant period of 1.06876 d could be detected in the first photometricdata set. In accordance with its position on the Hertzsprung-Russelldiagram and both its pulsation period and pulsation constant of 0.62 d,the primary component of VZ CVn should be an excellent γ Doraduscandidate. The less massive secondary component seems to have smallerradius with respect to its mass. Both components appear to have lowerluminosities with respect to their masses; hence, their radiativeproperties seem to be different. The evolutionary status of thecomponents is also discussed.
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Pulkovo compilation of radial velocities for 35495 stars in a common system.
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Effective temperature scale and bolometric corrections from 2MASS photometry
We present a method to determine effective temperatures, angularsemi-diameters and bolometric corrections for population I and II FGKtype stars based on V and 2MASS IR photometry. Accurate calibration isaccomplished by using a sample of solar analogues, whose averagetemperature is assumed to be equal to the solar effective temperature of5777 K. By taking into account all possible sources of error we estimateassociated uncertainties to better than 1% in effective temperature andin the range 1.0-2.5% in angular semi-diameter for unreddened stars.Comparison of our new temperatures with other determinations extractedfrom the literature indicates, in general, remarkably good agreement.These results suggest that the effective temperaure scale of FGK starsis currently established with an accuracy better than 0.5%-1%. Theapplication of the method to a sample of 10 999 dwarfs in the Hipparcoscatalogue allows us to define temperature and bolometric correction (Kband) calibrations as a function of (V-K), [m/H] and log g. Bolometriccorrections in the V and K bands as a function of T_eff, [m/H] and log gare also given. We provide effective temperatures, angularsemi-diameters, radii and bolometric corrections in the V and K bandsfor the 10 999 FGK stars in our sample with the correspondinguncertainties.
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New Photoelectric Light Curves of VZ Canum Venaticorum
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Kinematics and properties of F stars near the North Galactic Pole. II - The isothermal disc
Radial velocities are given for about 550 photometrically-identifieddisk-population F stars lying within 15 deg of the North Galactic Pole.The overall radial and z-velocity distributions are found to be closelyGaussian, with corrected rms and mean z velocities of 11.3 + or - 0.6and -9.5 + or - 0.5 km/s, respectively. The isothermal kinematics of thepopulation are reflected in the constant velocity dispersion to a zdistance of 400 pc. No systematic variation of either the velocitydispersion or the stellar age with the metallicity-sensitive Stromgrendelta m1 index is noted over a range of ages up to 5 Gyr.
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Further Studies of A-Stars and F-Stars in the Region of the North Galactic Pole - Part Four - a Catalogue of Uvbyr Photometry and Derived Quantities
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Further Studies of A-Stars and F-Stars in the Region of the North Galactic Pole - Part Three - a Catalogue of Star Names and Positions
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Photometric orbit of VZ CVn and the variation of its light curve
Abstract image available at:http://adsabs.harvard.edu/abs/1974A&AS...13..119I
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Photometric studies of the eclipsing systems BV 412, BV 332, and V836Cyg.
Abstract image available at:http://adsabs.harvard.edu/abs/1968AJ.....73..164H
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INHABITED SKY
