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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.
| Infrared high angular resolution measurements of stellar sources. V. Angular diameters of ten late-type stars
In the framework of an ongoing series of high angular resolutionobservations by lunar occultations in the near infrared, we presentaccurate angular measurements for ten late-type giant stars, seven ofwhich were measured for the first time. The sample includes one K andseven M stars. It also includes two S stars, representing to ourknowledge the first direct determination of the angular diameter forthis class of stars. The measured angular diameters range from 2.50 to4.82 milliarcsec, with an average accuracy <5%. An exception isrepresented by the case of a star with a faint companion, where we havebeen able to investigate in detail the bias on the diameterdetermination, and hence on the effective temperature, which would becaused if the companion had not been included in the analysis. Wesuggest that faint undetected companions could explain at least some ofthe hitherto known cases of stars with effective temperatures remarkablylower than the standard calibration. For seven of the stars in thesample, we have used our own photometry in conjunction with values fromthe literature, to compute the bolometric fluxes and the effectivetemperatures, which we discuss in the context of existing calibrations.With the achieved accuracy level in the angular diameter, suchmeasurements are also valuable as calibrators or science verificationtargets for modern large ground-based interferometers. Based onobservations collected at TIRGO (Gornergrat, Switzerland). TIRGO isoperated by CNR - CAISMI Arcetri, Italy.
| Lunar occultation summary. III
Observations of 242 photoelectric lunar occultation events studied atErwin W. Fick Observatory are reported. Approximately one-fourth ofthese are reappearances. From each observation are estimated the minimummagnitude differences between the observed object and possibleundetected companions. Occultation observations are given of 23 starsbrighter than 6th mag, including Alpha Vir, Beta-1 Sco, Mu Gem, Xi-2Sgr, Zeta Tau, Lambda Gem, and Beta Cap.
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Pozíciós és asztrometriai adatok
| Csillagkép: | Ikrek |
| Rektaszcenzió: | 06h39m59.20s |
| Deklináció: | +20°29'11.4" |
| Vizuális fényesség: | 7.999 |
| RA sajátmozgás: | -2.5 |
| Dec sajátmozgás: | -24.2 |
| B-T magnitude: | 9.927 |
| V-T magnitude: | 8.159 |
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