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CHARM2: An updated Catalog of High Angular Resolution Measurements
We present an update of the Catalog of High Angular ResolutionMeasurements (CHARM, Richichi & Percheron \cite{CHARM}, A&A,386, 492), which includes results available until July 2004. CHARM2 is acompilation of direct measurements by high angular resolution methods,as well as indirect estimates of stellar diameters. Its main goal is toprovide a reference list of sources which can be used for calibrationand verification observations with long-baseline optical and near-IRinterferometers. Single and binary stars are included, as are complexobjects from circumstellar shells to extragalactic sources. The presentupdate provides an increase of almost a factor of two over the previousedition. Additionally, it includes several corrections and improvements,as well as a cross-check with the valuable public release observationsof the ESO Very Large Telescope Interferometer (VLTI). A total of 8231entries for 3238 unique sources are now present in CHARM2. Thisrepresents an increase of a factor of 3.4 and 2.0, respectively, overthe contents of the previous version of CHARM.The catalog is only available in electronic form at the CDS viaanonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsweb.u-strasbg.fr/cgi-bin/qcat?J/A+A/431/773
| CHARM: A Catalog of High Angular Resolution Measurements
The Catalog of High Angular Resolution Measurements (CHARM) includesmost of the measurements obtained by the techniques of lunaroccultations and long-baseline interferometry at visual and infraredwavelengths, which have appeared in the literature or have otherwisebeen made public until mid-2001. A total of 2432 measurements of 1625sources are included, along with extensive auxiliary information. Inparticular, visual and infrared photometry is included for almost allthe sources. This has been partly extracted from currently availablecatalogs, and partly obtained specifically for CHARM. The main aim is toprovide a compilation of sources which could be used as calibrators orfor science verification purposes by the new generation of largeground-based facilities such as the ESO Very Large Interferometer andthe Keck Interferometer. The Catalog is available in electronic form atthe CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or viahttp://cdsweb.u-strasbg.fr/cgi-bin/qcat?J/A+A/386/492, and from theauthors on CD-Rom.
| A photometric study of the W UMa-type system RZ Tauri
The present study deals with the problem of the orbital and physicalparameters' estimation of the W UMa type eclipsing binary RZ Tauri,based on the interpretation of new photometric U B V R observations. Thelight curves obtained at the Maidanak Observatory during 1989-91 show aslight asymmetry around secondary minima and the small difference in theheight of the successive maxima. They are analysed in the framework ofthe Roche computer model (Djurašević, \cite{Djurasevica})by applying the inverse-problem method (Djurašević,\cite{Djurasevicb}) based on Marquardt's (\cite{Marquardt}) algorithm.The analysis shows that RZ Tau system is in an overcontact configurationwith q=m_2/m_1break ~ 0.362 and i=82(o.8) , generating total-annulareclipses. The best fitting is achieved with a bright active region onthe secondary star, placed near the neck region between the components,with the temperature contrast between the spotted area and thesurrounding photosphere being A_S=T_S/T_2 ~ 1.070. The spectral type ofthis system (F0 V) defines its behaviour as being between convective andradiative. Because of that we treated the gravity-darkening coefficientsas free parameters in the inverse problem. The obtained value (beta_{1,2} ~ 0.215) is like to be appropriate for this case, showing that thecommon envelope of RZ Tauri is partly convective. The basic parametersof the system and of the active region are estimated for all individualU, B, V and R light curves. The data are available in electronic form atthe CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.70.128.5) or viahttp://cdsweb.u-strasbg.fr/Abstract.html
| Interstellar extinction in the Taurus dark clouds. II
The results of photoelectric photometry of 89 stars in the Vilniusseven-color system in the area of the Taurus dark clouds withcoordinates (1950) 4h16m-4h33m, +16 deg-+20 deg are presented.Photometric spectral types, absolute magnitudes, color excesses,interstellar extinctions and distances of the stars are determined. Thedistance of the dark nebula is found to be 140 pc and is in goodagreement with the distance determined by Straizys and Meistas (1980)for the dark nebula Khavtassi 286, 278. The average extinction in theinvestigated area is of the order of 1.4.
| Helligkeiten und Eigenbewegungen in den Hyaden. Mit 6 Textabbildungen
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Besorolás csoportokba:
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Pozíciós és asztrometriai adatok
| Csillagkép: | Bika |
| Rektaszcenzió: | 04h33m00.81s |
| Deklináció: | +19°20'53.9" |
| Vizuális fényesség: | 7.409 |
| RA sajátmozgás: | 11.2 |
| Dec sajátmozgás: | -32 |
| B-T magnitude: | 8.882 |
| V-T magnitude: | 7.531 |
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