Contents
Images
Upload your image
DSS Images Other Images
Related articles
Arcsecond Positions of UGC Galaxies
We present accurate B1950 and J2000 positions for all confirmed galaxiesin the Uppsala General Catalog (UGC). The positions were measuredvisually from Digitized Sky Survey images with rms uncertaintiesσ<=[(1.2")2+(θ/100)2]1/2,where θ is the major-axis diameter. We compared each galaxymeasured with the original UGC description to ensure high reliability.The full position list is available in the electronic version only.
| Galaxy coordinates. II. Accurate equatorial coordinates for 17298 galaxies
Using images of the Digitized Sky Survey we measured coodinates for17298 galaxies having poorly defined coordinates. As a control, wemeasured with the same method 1522 galaxies having accurate coordinates.The comparison with our own measurements shows that the accuracy of themethod is about 6 arcsec on each axis (RA and DEC).
| An image database. II. Catalogue between δ=-30deg and δ=70deg.
A preliminary list of 68.040 galaxies was built from extraction of35.841 digitized images of the Palomar Sky Survey (Paper I). For eachgalaxy, the basic parameters are obtained: coordinates, diameter, axisratio, total magnitude, position angle. On this preliminary list, weapply severe selection rules to get a catalog of 28.000 galaxies, wellidentified and well documented. For each parameter, a comparison is madewith standard measurements. The accuracy of the raw photometricparameters is quite good despite of the simplicity of the method.Without any local correction, the standard error on the total magnitudeis about 0.5 magnitude up to a total magnitude of B_T_=17. Significantsecondary effects are detected concerning the magnitudes: distance toplate center effect and air-mass effect.
| A survey of the Pisces-Perseus supercluster. VI - The declination zone +15.5 deg to 21.5 deg
New results are presented of Arecibo observations in the 21 cm line of765 galaxies with declinations between 15.5 deg and 21.5 deg, in thePisces-Perseus supercluster zone. If considered independently on theneighboring parts of sky, this region, to the South of the superclusterridge, shows significantly less evidence of structure on large scales inexcess of 30 Mpc, contrasting substantially with the characteristics ofthe declination zones immediately to the North.
| Large-scale structure of the Hercules supercluster.
Not Available
| Magnesium, silicon, and iron abundances and the cluster metallicity scale
Abundances have been determined for a number of giant stars in open andglobular clusters on the basis of broadband Washington photometry, andhigh-resolution echelle spectroscopy. The photometric observations weremade with the CTIO 91-nm and 1.5 m reflectors, and the KPNO 1.3 mreflector during 44 consecutive nights between May 1980 and September1982. The spectrographic observations were carried out between 1981 andJanuary 1982, with the KNO KPNO 4-m echelle spectrograph. The spectralresolution was approximately 0.3 A and the wavelength coverage was from5500 to 7000 A. The classical metal-rich globular clusters NGC 6352,M69, and M71 are found to have Fe/H values of less than -1. Themetal-poor open clusters NGC 2141, 2158, 2506, and Melotte 66 have Fe/Hvalues ranging from -0.5 to -1.2. Mg and Si were significantly enhancedrelative to Fe in many of the clusters, and a much better correlation isfound between the color of the cluster giant branch and the mean (Mg +Si + Fe) abundance than with the Fe abundance alone. The data for thecluster abundances are presented in a table.
|
Submit a new article
Related links
Submit a new link
Member of following groups:
|
Observation and Astrometry data
Catalogs and designations:
|
