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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.
| A catalog of far-ultraviolet point sources detected with the fast FAUST Telescope on ATLAS-1
We list the photometric measurements of point sources made by the FarUltraviolet Space Telescope (FAUST) when it flew on the ATLAS-1 spaceshuttle mission. The list contains 4698 Galactic and extragalacticobjects detected in 22 wide-field images of the sky. At the locationssurveyed, this catalog reaches a limiting magnitude approximately afactor of 10 fainter than the previous UV all-sky survey, TDl. Thecatalog limit is approximately 1 x 10-14 ergs A sq cm/s,although it is not complete to this level. We list for each object theposition, FUV flux, the error in flux, and where possible anidentification from catalogs of nearby stars and galaxies. Thesecatalogs include the Michigan HD (MHD) and HD, SAO, the HIPPARCOS InputCatalog, the Position and Proper Motion Catalog, the TD1 Catalog, theMcCook and Sion Catalog of white dwarfs, and the RC3 Catalog ofGalaxies. We identify 2239 FAUST sources with objects in the stellarcatalogs and 172 with galaxies in the RC3 catalog. We estimate thenumber of sources with incorrect identifications to be less than 2%.
| Speckle imaging with the MAMA detector: Preliminary results
We report on the first successful speckle imaging studies using theStanford University speckle interferometry system, an instrument thatuses a multianode microchannel array (MAMA) detector as the imagingdevice. The method of producing high-resolution images is based on theanalysis of so-called 'near-axis' bispectral subplanes and follows thework of Lohmann et al. (1983). In order to improve the signal-to-noiseratio in the bispectrum, the frame-oversampling technique of Nakajima etal. (1989) is also employed. We present speckle imaging results ofbinary stars and other objects from V magnitude 5.5 to 11, and thequality of these images is studied. While the Stanford system is capableof good speckle imaging results, it is limited by the overall quantumefficiency of the current MAMA detector (which is due to the response ofthe photocathode at visible wavelengths and other detector properties)and by channel saturation of the microchannel plate. Both affect thesignal-to-noise ratio of the power spectrum and bispectrum.
| Photometry of southern stars. I - The W UMa binary SX Corvi and the RS CVn binary HD 155555
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1984A&A...135...23S&db_key=AST
| UBV photometry of RV CrV
Abstract image available at:http://adsabs.harvard.edu/abs/1974A&AS...13..101A
| BD-18° 3437, a new short period eclipsing binary
Abstract image available at:http://adsabs.harvard.edu/abs/1974A&AS...13...81S
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| Takýmyýldýz: | Karga |
| Sað Açýklýk: | 12h40m06.02s |
| Yükselim: | -18°31'58.2" |
| Görünürdeki Parlaklýk: | 8.741 |
| Uzaklýk: | 127.714 parsek |
| özdevim Sað Açýklýk: | -36 |
| özdevim Yükselim: | 3.2 |
| B-T magnitude: | 9.155 |
| V-T magnitude: | 8.776 |
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