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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.
| New binary stars discovered by lunar occultations. VI.
We present additional results from our ongoing lunar occultationprogram. Observations are presented here for a total of seventeensources, for the majority of which one or two new companions aredetected. The sample comprises mostly field stars, spanning a largerange of spectral types. Two infrared objects without opticalcounterpart are also included. The range of projected separations is0farcs007 to 0farcs162 . We report on the following binary stars:IRAS 16576-2116, IRAS 19495-1628,IRAS 18033-1955, CGCS 3964,SAO 94064, EI Tau, SAO93950, SAO 79217, SAO79285 and SAO 80075. We found HD247924 and SAO 139322 to be triple systems.In the case of SAO 93950, the revised analysis of twooccultation events has provided the true position angle and separationof this system. We also observed the young T Tauri star GG TauA, where we detected a significant orbital motion with respectto the latest available measurements. In two cases, SAO79285 and SAO 139322, a companion wasalready claimed on the basis of Hipparcos results, but our observationsare not entirely consistent with these latter. Finally, our sampleincludes four stars known to be binary, namely SAO186497, SAO 162183, SAO96753 and SAO 161192, for which we did notdetect a companion. Among these, our negative detection of the companionof SAO 162183 poses strong constraints on theparameters of this presumed binary. Based on observations collected atTIRGO (Gornergrat, Switzerland), and at Calar Alto (Spain). TIRGO isoperated by CNR-CAISMI Arcetri, Italy. Calar Alto is operated by theGerman-Spanish Astronomical Center.
| Two-colour photometry for 9473 components of close Hipparcos double and multiple stars
Using observations obtained with the Tycho instrument of the ESAHipparcos satellite, a two-colour photometry is produced for componentsof more than 7 000 Hipparcos double and multiple stars with angularseparations 0.1 to 2.5 arcsec. We publish 9473 components of 5173systems with separations above 0.3 arcsec. The majority of them did nothave Tycho photometry in the Hipparcos catalogue. The magnitudes arederived in the Tycho B_T and V_T passbands, similar to the Johnsonpassbands. Photometrically resolved components of the binaries withstatistically significant trigonometric parallaxes can be put on an HRdiagram, the majority of them for the first time. Based on observationsmade with the ESA Hipparcos satellite.
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