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Johnson photometry of southern Blazhko targets
We report on differential photomultiplier photometry in the Johnson Band V filters of five southern Blazhko stars (RU Cet, RY Col, V674 Cen,AR Ser, RV Cap). The data were gathered from the South AfricanAstronomical Observatory (SAAO) in Sutherland, South Africa, in thecourse of 2004 and 2005. To find the most reliable values for theperiods, we combined our V data with ASAS photometry. For some stars,this enabled us to constrain their Blazhko period with unprecedentedaccuracy.
| 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.
| Colors, luminosities, and motions of the nearer G-type stars
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1964AJ.....69..570E&db_key=AST
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תצפית ומידע אסטרומטרי
| קבוצת-כוכבים: | לויתן |
| התרוממות ימנית: | 01h01m20.11s |
| סירוב: | -16°17'40.6" |
| גודל גלוי: | 8.097 |
| מרחק: | 113.895 פארסק |
| תנועה נכונה: | -32.3 |
| תנועה נכונה: | -31.7 |
| B-T magnitude: | 8.561 |
| V-T magnitude: | 8.136 |
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