Contingut
Imatges
Carregar la teva Imatge
DSS Images Other Images
Articles Relacionats
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 search for more Cepheid binaries
New UBV(RI)c photometric and photoelectric radial velocity observationsof six short-period Galactic Cepheids are presented. The data are usedto search for binaries among these stars. AT Pup is revealed as a newspectroscopic binary system. Its companion is likely to be amain-sequence star of spectral type B5 or later. T Vel may be anotherspectroscopic binary with a red companion, and there is some evidencefor a blue photometric companion to GI Car.
|
Enviar un nou article
Enllaços Relacionats
- - No s'ha trobat enllaços -
Enviar un nou enllaç
Membre dels grups següents:
|
Dades d'Observació i Astrometria
| Constel·lació: | Centaurus |
| Ascensió Recta: | 13h23m13.63s |
| Declinació: | -62°52'16.9" |
| Magnitud Aparent: | 7.997 |
| Distancia: | 118.483 parsecs |
| Moviment propi RA: | -48.2 |
| Moviment propi Dec: | -1.9 |
| B-T magnitude: | 8.561 |
| V-T magnitude: | 8.044 |
Catàlegs i designacions:
|
