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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.
| Early type high-velocity stars in the solar neighborhood. IV - Four-color and H-beta photometry
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Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1983AJ.....88.1349S&db_key=AST
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UBV photometry of 79 faint southern blue stars is reported. Theseobjects were taken primarily from the lists of Jaidee and Lynga and ofChavira. From their positions in the two-color diagrams, a table ofprobable white dwarfs is derived. The colors of additional peculiarsources, including the X-ray quasar 2A2251 - 179, two Fairall galaxies,and the Glass-Zuiderwijk optical identification of the X-ray source2S1702 - 363 and white dwarfs are also given.
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Abstract image available at:http://adsabs.harvard.edu/abs/1977MNRAS.178..369K
| Photometry of faint blue stars. II - A second list of southern stars
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| A search for flare stars in the Orion Nebula region
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Osservazione e dati astrometrici
| Costellazione: | Fenice |
| Ascensione retta: | 00h28m49.82s |
| Declinazione: | -49°05'57.8" |
| Magnitudine apparente: | 10.13 |
| Moto proprio RA: | 74.9 |
| Moto proprio Dec: | -48.1 |
| B-T magnitude: | 10.68 |
| V-T magnitude: | 10.176 |
Cataloghi e designazioni:
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