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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.
| SANTIAGO 91, a right ascension catalogue of 3387 stars (equinox J2000).
The positions in right ascension of 3387 stars belonging to the Santiago67 Catalogue, observed with the Repsold Meridian Circle at Cerro Calan,National Astronomical Observatory, during the period 1989 to 1994, aregiven. The average mean square error of a position, for the wholeCatalogue, is +/-0.009 s. The mean epoch of the catalogue is 1991.84.
| Secondary UVBY standards in the Harvard E-regions
Photoelectric uvby photometry for 201 stars which are already UBV (RI)cstandards is presented. The photoelectric data are closely tied to theCousins uvby standards and the stars should be suitable for use asfainter (7-11 mag) secondary standards.
| A survey of trigonometric parallaxes and proper motions with the UK Schmidt telescope. II - Astrometric and photometric data for a complete sample of 6125 stars brighter than B = 17.5, V = 17.0 in the South Galactic CAP
Abstract image available at:http://adsabs.harvard.edu/abs/1986MNRAS.223..629M
| Four-colour observations of primary and secondary UVBY standards
Stromgren uvby photometry of primary standards and of the secondarystandards observed by Cousins (1985) in the E regions and by Twarog(1984) near the South Galactic Pole suggests that the Twarog c1 resultsare not on the standard system. Inconsistencies also occur in V and m1but it is not clear from which data these arise. Intercomparisonsdiscussed in this paper and by Eggen (1982, 1984) suggest thatsystematic errors, particularly in m1 and c1, could be widespread inSouthern Hemisphere uvby observations.
| UVBY secondary standards near the South Galactic Pole
uvby photometry of sufficient accuracy to qualify as secondary standarddata is presented for 36 stars of spectral type A5-G5 near the SouthGalactic Pole. The stars range in magnitude from V = 8.4 to 13.5. Twoanomalous stars, one an earlier misidentified and one a variable in V,are discussed.
| Stellar population samples at the galactic poles. III - UBVRI observations of proper motion stars near the south pole and the luminosity laws for the halo and old disk populations
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1976ApJS...30..351E&db_key=AST
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| Сазвежђа: | Вајар |
| Ректацензија: | 00h46m31.08s |
| Deклинација: | -28°33'13.6" |
| Apparent магнитуда: | 9.168 |
| Proper motion RA: | -90.4 |
| Proper motion Dec: | -49.8 |
| B-T magnitude: | 9.928 |
| V-T magnitude: | 9.231 |
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