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Публикации по объекту
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.
| Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS) - Third edition - Comments and statistics
The Catalogue, available at the Centre de Données Stellaires deStrasbourg, consists of 13 573 records concerning the results obtainedfrom different methods for 7778 stars, reported in the literature. Thefollowing data are listed for each star: identifications, apparentmagnitude, spectral type, apparent diameter in arcsec, absolute radiusin solar units, method of determination, reference, remarks. Commentsand statistics obtained from CADARS are given. The Catalogue isavailable in electronic form at the CDS via anonymous ftp tocdsarc.u-strasbg.fr (130.79.128.5) or viahttp://cdsweb.u-strasbg.fr/cgi-bin/qcar?J/A+A/367/521
| Radio continuum emission from stars: a catalogue update.
An updated version of my catalogue of radio stars is presented. Somestatistics and availability are discussed.
| A 1.5 GHz radio survey of the Hyades open stellar cluster
Results of a radio survey of the Hyades open stellar cluster carried outwith the VLA at 1.5 GHz are reported. Seventeen fields containing over150 cataloged stars were mapped down to a limiting sensitivity rangingfrom 0.3 mJy at the centers of the fields to 0.9 mJy at a distance of 20arcmin from field centers. Two stars were detected as radio sources: theevolved spectroscopic binary V471 Tau, consisting of a white dwarf and ared dwarf; and the apparently premain-sequence G+K star spectroscopicbinary HD 27130. The failure to detect any single stars as radio sourcesis generally consistent with the age-rotation-activity paradigm,according to which stellar activity is due to magnetic fields producedby dynamo action in rapidly rotating stars and should decrease with ageas a star spins down due to magnetic braking. It is concluded that theHyades M dwarf population is not more active at radio wavelengths thanthe nearby flare star population, or else the number of flare stars inthe Hyades is much less than presently assumed.
| UBVRI photometry of FKSZ stars. IV
The paper presents UBVRI photometry, in the Kron-Cousins system, for 117stars of the Catalog of Fundamental Faint Stars in the declination zone+18-0 deg. The observations were performed from July 1988 to March 1990with the ESO 0.50-m telescope at the ESO in La Silla, Chile. The resultsof 24 nights of observations are reported.
| Infrared spectra and circumstellar emission of late-type stars
NIR photometry has been carried out for 63 M-type stars in eightphotometric bands. Four bands were the usual J, H, K, and L bands ofbroad-band photometry, and the other four were defined with relativelynarrow filters at 3.1, 3.3, 3.4, and 3.7 microns to measure the strengthof a stellar H2O absortion band centered at about 2.7 microns. Theeffects of circumstellar emission due to silicate dust on the energyspectra of oxygen-rich stars are extracted on the basis of the presentdata and IRAS photometric data. Peculiar carbon stars which exhibit asilicatelike emission feature at 10 microns were searched for from about1800 carbon stars. Eleven new candidate carbon stars were found.
| A Catalog of Stellar Angular Diameters Measured by Lunar Occultation
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1987AJ.....94..751W&db_key=AST
| Cloudcroft occultation summary. I - December 1978-March 1980
Results are presented from the first 16 months of a program undertakento record lunar occultations at Cloudcroft Observatory. The 85 eventssummarized include 38 observations of stars brighter than seventhmagnitude, 26 reappearances, nine angular diameter measurements, and 11observations of binary stars or stars which may be double.
| Angular diameters by the lunar occultation technique. V - 26 late-type stars
Near-infrared occultation observations have yielded 37 new angulardiameter measurements for 26 late-type stars. The list includes threecarbon stars and five giants in the range M4-M8. A multichannelphotometer has been tested successfully on five events.
| Photoelectric observations of lunar occultations. XII
Occultation observations of 414 events observed between 6 July 1979 and4 September 1980 with the 0.76-m telescope of McDonald Observatory arereported. Timings and data on double stars are given. Angular diameterinformation in six cases is included. The stars concerned with their runnumbers are: SAO 161754 (5270); 94027 (Alpha Tau) (5319, 5381, 5454);159370 (Gamma Lib) (5325, 5571); 162413 (43 Sgr) (5332); 97472 (3 Cnc)(5414); and 93955 (Theta Tau) (5445).
| Angular diameters by the lunar occultation technique. III
Diameters for 13 stars are reported. Two of these involve simultaneousobservations at two telescopes, and repeat measurements are presentedfor three additional stars. A highly reliable diameter of the carbonstar SZ Sgr is reported, and included in an analysis of the relationshipbetween the effective and color temperatures for carbon stars. Formalerror estimates for the diameters from least-squares solutions arediscussed based on accumulated multiple measurements for 24 stars.
| Illinois occultation summary. I - 1977-1978
Results are presented for the first two years of a program for therecording of lunar occultations primarily of bright stars or objects ofspecial interest. Observations were obtained using a single-channelCassegrain photometer at a 1-m reflector using various filters toprovide spectral definition, with the tracking of guide stars used toachieve telescope pointing. Of the 64 events observed, 30 were of starsbrighter than 7 magnitudes, 40 were reappearances, four were used forangular diameter measurements, eight were binary star observations andsix may indicate multiple stars.
| Photoelectric observations of lunar occultations
Photoelectric observations of 13 lunar occultation disappearances duringa March 1979 Hyades passage are reported. Three double stars (SAO 93925= Fin 342 = 70 Tau, SAO 93961 = ADS 3248, and SAO 95419 = Kui 24) andone possible double (SAO 93950 = 75 Tau) were detected. A briefdescription is given of the Purdue University pulse-counting photometeras modified for occultation observations.
| Classification of 831 two-micron sky survey sources south of +5 degrees.
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1975AJ.....80.1011H&db_key=AST
| The polarization of T and RY Tau.
Not Available
| Helligkeiten und Eigenbewegungen in den Hyaden. Mit 6 Textabbildungen
Not Available
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Наблюдательные данные и астрометрия
| Созвездие: | Телец |
| Прямое восхождение: | 04h30m05.24s |
| Склонение: | +16°10'18.1" |
| Видимая звёздная величина: | 7.73 |
| Собственное движение RA: | 22.5 |
| Собственное движение Dec: | 17.1 |
| B-T magnitude: | 10.145 |
| V-T magnitude: | 7.93 |
Каталоги и обозначения:
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