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The Y Band at 1.035 Microns: Photometric Calibration and the DwarfStellar/Substellar Color Sequence
We define and characterize a photometric bandpass (called ``Y'') that iscentered near 1.035 μm, in between the traditionally classified``optical'' and ``infrared'' spectral regimes. We present Y magnitudesand Y-H and Y-K colors for a sample consisting mostly of photometric andspectral standards, spanning the spectral type range sdO to T5 V. Deepmolecular absorption features in the near-infrared spectra of extremelycool objects are such that the Y-H and Y-K colors grow rapidly withadvancing spectral type especially from late M through mid-L,substantially more rapidly than J-H or H-K, which span a smaller totaldynamic range. Consistent with other near-infrared colors, however, Y-Hand Y-K colors turn blueward in the L6-L8 temperature range, with laterT-type objects having colors similar to those of warmer M and L stars.Y-J colors remain constant at 1.0+/-0.15 mag from early-L through late-Tdwarfs. The slope of the interstellar reddening vector within thisfilter is AY=0.38AV. Reddening moves stars nearlyalong the YHK dwarf color sequence, making it more difficult todistinguish unambiguously very low mass candidate brown dwarf objectsfrom higher mass stars seen, e.g., through the Galactic plane or towardstar-forming regions. Other diagrams involving the Y band may besomewhat more discriminating.
| UBVJHKLM photometry of Nova Aquilae 1995.
Not Available
| Dust condensation in the shell of Nova Aql 1993
Not Available
| UvbyHbeta_ photometry of main sequence A type stars.
We present Stroemgren uvby and Hbeta_ photometry for a set of575 northern main sequence A type stars, most of them belonging to theHipparcos Input Catalogue, with V from 5mag to 10mag and with knownradial velocities. These observations enlarge the catalogue we began tocompile some years ago to more than 1500 stars. Our catalogue includeskinematic and astrophysical data for each star. Our future goal is toperform an accurate analysis of the kinematical behaviour of these starsin the solar neighbourhood.
| Vitesses radiales. Catalogue WEB: Wilson Evans Batten. Subtittle: Radial velocities: The Wilson-Evans-Batten catalogue.
We give a common version of the two catalogues of Mean Radial Velocitiesby Wilson (1963) and Evans (1978) to which we have added the catalogueof spectroscopic binary systems (Batten et al. 1989). For each star,when possible, we give: 1) an acronym to enter SIMBAD (Set ofIdentifications Measurements and Bibliography for Astronomical Data) ofthe CDS (Centre de Donnees Astronomiques de Strasbourg). 2) the numberHIC of the HIPPARCOS catalogue (Turon 1992). 3) the CCDM number(Catalogue des Composantes des etoiles Doubles et Multiples) byDommanget & Nys (1994). For the cluster stars, a precise study hasbeen done, on the identificator numbers. Numerous remarks point out theproblems we have had to deal with.
| Selection of standard stars for photometric observations with the 91-cm reflector at Okayama
Not Available
| Erratum - Some Errata in the Fifth General Catalogue of MK Spectral Classifications
Not Available
| AS 296, a symbiotic star of very high radial velocity
Not Available
| A Catalogue of High-Velocity Stars.
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1955ApJS....2..195R&db_key=AST
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Наблюдательные данные и астрометрия
| Созвездие: | Змееносец |
| Прямое восхождение: | 18h14m01.02s |
| Склонение: | +00°11'58.0" |
| Видимая звёздная величина: | 9.376 |
| Собственное движение RA: | -0.7 |
| Собственное движение Dec: | -13.2 |
| B-T magnitude: | 9.775 |
| V-T magnitude: | 9.409 |
Каталоги и обозначения:
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