Contents
Images
Upload your image
DSS Images Other Images
Related articles
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.
| Evolved GK stars near the Sun. 2: The young disk population
From a sample of nearly 2000 GK giants a group of young disk stars withwell determined space motions has been selected. The zero point of theluminosity calibrations, both from the ultraviolet flux (modifiedStroemgren system) and that in the region of 4200 to 4900 A (DDOsystem), show a discontinuity of about a half magnitude at the border ofthe young disk and old disk domains. The population separation is basedon the space velocity components, which are also an age discriminant,with the population interface near 2 x 109 yr, based onmodels with convective overshoot at the core. This age corresponds togiant masses near 1.7 solar mass, near the critical mass separating theyoung stars that do not burn helium in degenerate cores from older starsthat do. Ten percent of both populations show CN anomalies in that thederived value of P(Fe/H) from CN (Cm) and fromFe(M1) differ by more than 0.1 dex and the weak and strong CNstars occur equally in the old disk but the weak CN stars predominate inthe young disk. Peculiar stars, where flux distortions affect theluminosity calibrations, are of the CH+(Ba II) and CH-(weak G band)variety and represent less than 1% of the stars in both populations. Theyoung disk giants are restricted to ages greater than about109 yr, because younger stars are bright giants orsupergiants (luminosity class 2 or 1), and younger than about 2 x109 yr, because the old disk-young disk boundary occurs near1.7 solar mass. The distribution of heavy element abundances, P(Fe/H),for young disk giants is both more limited in range (+/- 0.4 dex) and isskewed toward higher abundances, compared with the nearly normaldistribution for old disk giants. The distribution of (U,V) velocityvectors gives (U,V,W) and their dispersions = (+17.6 +/- 18.4, -14.8 +/-8.4, -6.9 +/- 13.0) and (+3.6 +/- 38.4, -20.7 +/- 27.5, -6.7 +/-17.3)km/s for young and old disk giants, respectively.
| Narrow-band photometry of late-type stars. II
This paper presents extensive narrow-band photometry in the Uppsalasystem supplementing earlier published mesurements so that data now areavailable for all late-type stars brighter than V = 6.05 and a number ofgalactic cluster members. Numerous UBV and BV measurements are alsopublished. The data are used to determine relations for the predictionof UBV intrinsic colors for late-type stars from the narrow-bandmeasurements. The main purpose of the data is to constitute the basisfor the determination of solar-neighborhood space densities of late-typestars, mainly giants of different kinds; these space densities will becombined with narrow-band data for fainter stars in the north Galacticpole region to yield the decrease of space density with distance fromthe galactic plane for many kinds of late-type stars.
| A systematic search for members of the Hyades Supercluster. V - The red giants
The membership of bright, red giants in the Hyades Supercluster isdetermined by studying their proper motions and their radial velocities.At least 44 of the giants in the Bright Star Catalogue are found to bemembers of the Supercluster, including the known variables R Hya, Pi'Grum TW Hor, NP Pup, R Lyr, VZ Cam, and AD Cet. The nearest member at 29pc is HR 2715, which is also the oldest at 10 to the 9th yr. Thevariables contain a mixture of modes of pulsation and noperiod-luminosity relation is found. The majority of the members are G8to K0 stars and the lone billion-yr old member is all that is expectedfrom the number of A stars of that age in the Supercluster. Theavailable intermediate-band photometry gives luminosities in reasonableagreement with the astrometric values and, together with DDO photometry,shows consistency in the heavy-element abundance of G- and K-typeSupercluster members.
| NGC 2423 and the red giants of the Hyades supercluster
An extensive set of photometric data for members of the cluster NGC 2423is examined, and the results are compared with those for red giantmembers of the Hyades supercluster. Intermediate band and RI or H-betaobservations for 34 stars of the cluster are listed, and photometricparameters for A and F stars in the cluster are shown. Parameters arealso depicted for red giants in the Hyades supercluster, red giants ofHyades abundance, and M type variables in the Hyades supercluster. Theintrinsic (b-y), M(1) and (R-I),(b-y) relations for normal giants withHyades metal abundance are presented. NGC 2423 is shown to be verysimilar to the Hyades with red giants that match the luminosity andtemperature distribution of those in the Hyades. The red giants of theHyades which are within about 200 pc of the sun are found to haveparallel (U,V) motions with the main sequence stars of the Hyadesnuclear cluster.
| DDO Observations of Southern Stars
Not Available
| Intermediate band photometry of late-type stars. II - Some stellar groups
Observations on the (R, I) system and a modified Stromgren system ofmembers of six stellar groups are used to demonstrate the chemicalhomogeneity of some 70% or 80% of the members assigned to the groups onthe basis of kinematics. The groups discussed are the Hyades, Wolf 630,Arcturus, Groombridge 1830, and Kapteyn's Star Groups as well as ananonymous group of a half dozen subdwarfs with (U, V) near (-150, -320)km/s. Standards for a previously described photometric system areextended, and additional F- and G-type standards for the (R, I) systemare presented. A simple relation is derived for computing the Fe/Habundance ratio for most stars in the corrected (R-I) interval from +0.2to +0.45 magnitude.
| DDO intermediate-band photometry of moving-group stars.
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1975PASP...87...17B&db_key=AST
| Luminosity and velocity distributions of high-luminosity red stars. IV. The G-type giants
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1974PASP...86..129E&db_key=AST
| The red giants in the Hyades group
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1972PASP...84..406E&db_key=AST
| Rotational Velocities in Short-Period A-Type Binaries
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1971ApJ...163..333A&db_key=AST
| Rotational velocities of G and K giants in the Hyades moving group.
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1971A&A....11..477S&db_key=AST
| Stellar kinematics and evolution
Not Available
| Stellar groups, VII. The structure of the Hyades group
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1960MNRAS.120..540E&db_key=AST
|
Submit a new article
Related links
Submit a new link
Member of following groups:
|
Observation and Astrometry data
| Constellation: | Tucana |
| Right ascension: | 23h25m19.40s |
| Declination: | -56°50'57.0" |
| Apparent magnitude: | 5.59 |
| Distance: | 87.566 parsecs |
| Proper motion RA: | 85.1 |
| Proper motion Dec: | -20.6 |
| B-T magnitude: | 6.955 |
| V-T magnitude: | 5.715 |
Catalogs and designations:
|
