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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.
| Results from the Wide Angle Search for Planets Prototype (WASP0) - II. Stellar variability in the Pegasus field
Recent wide field photometric surveys, which target a specific field forlong durations, are ideal for studying both long- and short-periodstellar variability. Here, we report on 75 variable stars detectedduring the observations of a field in Pegasus using the Wide AngleSearch for Planets Prototype (WASP0) instrument, 73 of which are newdiscoveries. The variables detected include 16 δ Scuti stars, 34eclipsing binaries, 3 BY Draconis stars and 4 RR Lyraes. We estimatethat the fraction of stars in the field brighter than V~ 13.5 exhibitingvariable behaviour with an amplitude greater than 0.6 per cent rms is~0.4 per cent. These results are compared with other wide field stellarvariability surveys, and implications for detecting transits due toextra-solar planets are discussed.
| Vitesses radiales. Catalogue WEB: Wilson Evans Batten. Subtittle: Radial velocities: The Wilson-Evans-Batten catalogue.
We give a common version of the two catalogues of Mean Radial Velocitiesby Wilson (1963) and Evans (1978) to which we have added the catalogueof spectroscopic binary systems (Batten et al. 1989). For each star,when possible, we give: 1) an acronym to enter SIMBAD (Set ofIdentifications Measurements and Bibliography for Astronomical Data) ofthe CDS (Centre de Donnees Astronomiques de Strasbourg). 2) the numberHIC of the HIPPARCOS catalogue (Turon 1992). 3) the CCDM number(Catalogue des Composantes des etoiles Doubles et Multiples) byDommanget & Nys (1994). For the cluster stars, a precise study hasbeen done, on the identificator numbers. Numerous remarks point out theproblems we have had to deal with.
| Vitesse radiales dans 4 Selected Areas.
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Группы:
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Наблюдательные данные и астрометрия
| Созвездие: | Пегас |
| Прямое восхождение: | 22h19m40.39s |
| Склонение: | +16°09'46.6" |
| Видимая звёздная величина: | 7.9 |
| Расстояние: | 204.082 парсек |
| Собственное движение RA: | 3.3 |
| Собственное движение Dec: | 4.8 |
| B-T magnitude: | 8.2 |
| V-T magnitude: | 7.925 |
Каталоги и обозначения:
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