Contenidos
Imágenes
Subir su imagen
DSS Images Other Images
Artículos relacionados
Fe/H, age and distance for the F-stars of an unbiased radial velocity sample at the north Galactic pole
New limits for the normalization of stellar populations of the solarneighborhood have been suggested by Sandage and Fouts (1987). Log T(e),M(V), Fe/H abundance ratio, age A, distance and color excess arepresented for 183 stars of Sandage and Fouts' unbiased radial velocitysample located near the north Galactic pole.
| U, V, W velocity components for the old disk using radial velocities of 1295 stars in the three cardinal Galactic directions
New radial velocities are presented for 1295 stars chosen at random nearthe three cardinal Galactic directions of l = 180 deg, b = 0; l = 90deg, b = 0 deg; and b = 90 deg, giving the distribution in U, V, and W,respectively, from the radial velocities alone. The measurements weremade with the coude spectrograph of the Mount Wilson 100 in. Hookerreflector. The purpose of the program is to set limits on the densitynormalization in the solar neighborhood of the old thin disk, the oldthick disk, and the halo. Many more high-velocity stars are present inthe unbiased sample than expected from previous estimates of thenormalization. The data suggest the density ratios in the solarneighborhood to be about 90 percent, 10 percent, and about 0.5 percentfor the thin disk, thick disk, and halo populations, respectively.
| 2.2-micron field stars at the North Galactic Pole
The properties of the 2.2-micron field stars seen near the NorthGalactic Pole by the Two Micron Sky Survey and by surveys at highersensitivity are discussed. All the 2.2-micron sources found in thesesurveys can be identified with stars with known spectral types. Thedistribution of the 2.2-micron field stars appears to bewell-understood.
| Photoelectric surface photometry of the Coma cluster
The paper presents photoelectric observations at two wavelengths of thesurface brightness distribution over a large area of the Coma cluster.The distribution of cluster light is found to follow the distribution ofgalaxies very closely, and there is little luminosity outside the V25isophotes of the galaxies. The present data alone give an upper limit of25 per cent for the amount of the total cluster luminosity which mightcome from a smoothly distributed intergalactic medium.
| Recognition of objects and position recovery from microdensitometer measurements of large field plates
The Coma region on a glass copy of the Palomar Sky Survey has beenscanned with a microdensitometer. A method is described for obtainingthe photometric parameters and positions of the images; 12,316 objectshave been found. The repositioning of the scanner over the computedcoordinates is satisfactory. AGK3 stars were considered to evaluate theplate constants and the precision. Comparison with Dressel and Condon's(1976) positions of galaxies gives a rms scatter consistent with theinternal error of the published list.
| Photoelectric Magnitudes and Colors of Stars Near the North Galactic Pole.
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1964ApJ...140..151H&db_key=AST
| Photographic photometry at the North galactic Pole.
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1956AJ.....61...80S&db_key=AST
|
Enviar un nuevo artículo
Enlaces relacionados
- - No se han encontrado enlaces -
En viar un nuevo enlace
Miembro de los siguientes grupos:
|
Datos observacionales y astrométricos
Catálogos y designaciones:
|
