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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.
| Radial-velocity measurements. III - Ground observations accompanying the HIPPARCOS satellite observation program: Measurements of the radial velocities of 391 stars in 12 fields
The radial velocities of 391 stars, obtained with the Fehrenbachobjective prism associated to the Schmidt telescope of the Observatoirede Haute-Provence are presented. These stars belong to fields speciallychosen for containing several Hipparcos input catalog star members. Eachfield is presented independently. The list includes HD and BDidentifiers when available, 1950 coordinates, spectral type, and B and Vmagnitudes as they appear in the CSI catalog, the radial velocity, theprobable error, the number of independent measurements and commentariessuch as known radial velocity and their origin.
| Radial velocities for the hydrogen-deficient star HD 168476, several helium-strong and helium-weak stars
Radial-velocity measurements are reported for one hydrogen-deficientstar (the extreme helium-rich star HD 168476), three helium-strong stars(HD 93030, HD 96446, and HD 133518), and two helium-weak stars (HD 5737and HD 202671). Statistical tests are made to see if the stars arevariable. HD 168476 is found to be variable in a complex manner; thevariability of HD 93030 is confirmed but the period is revised to1.88016 + or - 0.0008 days; and variability is suspected for HD 96248and HD 5737. One of the stars used as a radial-velocity standard, HD113537, is also suspected of variability.
| Colors, luminosities, and motions of the nearer G-type stars
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1964AJ.....69..570E&db_key=AST
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Pozíciós és asztrometriai adatok
| Csillagkép: | Androméda |
| Rektaszcenzió: | 01h02m45.77s |
| Deklináció: | +45°25'31.1" |
| Vizuális fényesség: | 8.526 |
| Távolság: | 165.017 parszek |
| RA sajátmozgás: | -16.9 |
| Dec sajátmozgás: | -2.4 |
| B-T magnitude: | 8.954 |
| V-T magnitude: | 8.562 |
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