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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
| Twenty years of TIRGO telescope
We present the characteristics and the current status of the TelescopioInfrarosso del Gornergrat (Tirgo), the national infrared facilityoperating from the beginning of the 80s over the swiss alps. We describeits current instrumentation and resume its activities during its 20years of life.
| 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. V
We present recent results from our ongoing lunar occultation program onbinary stars at the TIRGO and Calar Alto observatories. Observations arepresented here for a total of seventeen sources, the majority of whichare resolved for the first time. These include SAO94621, IRAS 18154-1900, SAO98345, SAO 98363, SAO93947, SAO 97319, SAO97437, SAO 94986, SAO94488, DO 11742, SAO78027 and SAO 79799. Two speckle binarieswere also observed, namely SAO 98427 and SAO110723; this latter is discovered to be a quadruple system.SAO 77810 is found to be a new triple system. In thecases of SAO 94621 and SAO 98363,we have recorded two occultation light curves each, at differentposition angles: this allowed us to derive actual position angles andseparations for these binary systems. We report an observation of theoccultation binary SAO 94961, for which we could notdetect the companion. Finally, we report also an observation of thewell-studied multiple system SAO 97645 (zetaCnc), which is discussed in detail in a separate paper. Basedon observations collected at TIRGO (Gornergrat, Switzerland), and atCalar Alto (Spain). TIRGO is operated by CNR-CAISMI Arcetri, Italy.Calar Alto is operated by the German-Spanish Astronomical Center.
| Photoelectric measurements of lunar occultations. VIII
Photoelectric timings are reported for 276 lunar occultation eventswhich were observed between March 1975 and February 1976. The timings(in UTC) are based on Loran G equipment of a lunar laser-ranging groupor on WWV signals. Angular diameters are determined for HR 5301, HD176124, Chi-1-Orionis, and HR 601. Twenty cases of possible or actualdouble stars, including Beta Capricorni, are noted along with oneprobable triple system (51 Piscium). Several technical and computationaldifficulties encountered in this program are discussed.
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Observation and Astrometry data
| Constellation: | Orion |
| Right ascension: | 05h59m12.36s |
| Declination: | +20°10'05.6" |
| Apparent magnitude: | 8.903 |
| Proper motion RA: | 3.2 |
| Proper motion Dec: | -2.8 |
| B-T magnitude: | 10.93 |
| V-T magnitude: | 9.071 |
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