Contents
Images
Upload your image
DSS Images Other Images
Related articles
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
| J - K DENIS photometry of a VLTI-selected sample of bright southern stars
We present a photometric survey of bright southern stars carried outusing the DENIS instrument equipped with attenuating filters. Theobservations were carried out not using the survey mode of DENIS, butwith individual target pointings. This project was stimulated by theneed to obtain near-infrared photometry of stars to be used in earlycommissioning observations of the ESO Very Large TelescopeInterferometer, and in particular to establish a network of brightcalibrator sources.We stress that near-infrared photometry is peculiarly lacking for manybright stars. These stars are saturated in 2MASS as well as in regularDENIS observations. The only other observations available for brightinfrared stars are those of the Two Micron Sky Survey dating from overthirty years ago. These were restricted to declinations above≈-30°, and thus cover only about half of the sky accessible fromthe VLTI site.We note that the final 2MASS data release includes photometry of brightstars, obtained by means of point-spread function fitting. However, thismethod only achieves about 30% accuracy, which is not sufficient formost applications.In this work, we present photometry for over 600 stars, each with atleast one and up to eight measurements, in the J and K filters. Typicalaccuracy is at the level of 0\fm05 and 0\fm04 in the J and K_s bands,respectively.Based on observations collected at the European Southern Observatory, LaSilla.Tables 1 and 2 are only available in electronic form at the CDS viaanonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or viahttp://cdsweb.u-strasbg.fr/cgi-bin/qcat?J/A+A/413/1037
| 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. IV
We report on a total of 20 sources observed in the near infrared in thecourse of routine lunar occultation programs at the TIRGO and Calar Altoobservatories. The results consist either in discoveries of newbinaries, or in re-observations of known or suspected binaries whereonly incomplete information was previously available. For the firsttime, a companion has been detected around the following 6 stars:DO 2779, SAO 162001, SAO93083, IRC -20444, SAO162521, and GCVS 980. Additionally,SAO 93746 is discovered to be a triple system, withprojected separations at the 0farcs01 level. For the following 7 stars,our observations confirm previous reports of binarity and providecomplementary information in the infrared: SAO96746-A, SAO 161202, SAO94060, AG +16 403, SAO98270, SAO 93950 and SAO94554. Finally, for the following 4 stars, a companion hadbeen previously observed or suspected, but we could not detect it forvarious reasons: SAO 96810, SAO93961, SAO 93975 and SAO93981. The projected separations in our positive results rangefrom 0farcs01 to 0farcs57 , and the brightness ratios up to Delta K=4.4mag. In addition, two visual doubles, namely SAO184176 and SAO 94002, have also beenobserved and their projected angular separations and infrared brightnessratios are reported here. This paper is the fourth in a series, bringingto 58 the total number of binary sources studied by our group by meansof lunar occultations. Based on observations collected at TIRGO(Gornergrat, Switzerland), and at Calar Alto (Spain). TIRGO is operatedby CNR--CAISMI Arcetri, Italy. Calar Alto is operated by theGerman--Spanish Astronomical Center.
| The Tokyo PMC catalog 90-93: Catalog of positions of 6649 stars observed in 1990 through 1993 with Tokyo photoelectric meridian circle
The sixth annual catalog of the Tokyo Photoelectric Meridian Circle(PMC) is presented for 6649 stars which were observed at least two timesin January 1990 through March 1993. The mean positions of the starsobserved are given in the catalog at the corresponding mean epochs ofobservations of individual stars. The coordinates of the catalog arebased on the FK5 system, and referred to the equinox and equator ofJ2000.0. The mean local deviations of the observed positions from theFK5 catalog positions are constructed for the basic FK5 stars to comparewith those of the Tokyo PMC Catalog 89 and preliminary Hipparcos resultsof H30.
| Photoelectric observations of lunar occultations. XI
Occultation observations of 466 events are presented. These includediameter measures of Aldebaran under very bad conditions and a gooddiameter measure of 82 Vir. The list includes 91 reappearances andobservations of 34 double or multiple stars, both new and previouslyknown. The inconsistencies of the observations of Kui 88 are discussed.Further observations are most desirable.
| Observations of occultations of the stars made at the University Observatory, Brno, in the year 1959
Not Available
| Occultations observed at the Observatory Skalnaté Pleso in the second half of 1959
Not Available
| Not Available
Not Available
|
Submit a new article
Related links
Submit a new link
Member of following groups:
|
Observation and Astrometry data
| Constellation: | Sagittaire |
| Right ascension: | 18h56m14.38s |
| Declination: | -18°42'34.0" |
| Apparent magnitude: | 6.648 |
| Distance: | 134.409 parsecs |
| Proper motion RA: | 0 |
| Proper motion Dec: | -17.5 |
| B-T magnitude: | 7.867 |
| V-T magnitude: | 6.749 |
Catalogs and designations:
|
