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Pulkovo compilation of radial velocities for 35495 stars in a common system.
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| Infrared differential photometry of selected orbital binaries
High-angular resolution observations were acquired for a sample of F-Gand K nearby orbital binaries, making use of the ADONIS instrumentmounted at the 3.6m ESO telescope from La Silla observatory. The aim isto derive broad-band near-infrared colours for the individual componentsof those binaries which do not fit well the mean mass-luminosityrelation, but which have accurate parallaxes (from the Hipparcossatellite) and high-quality orbits, thanks to many previous efforts.Such colour determinations allow component temperatures and photometricmass ratios to be derived.
| Kinematics of Sandage-Fouts stars in three cardinal directions
V and (B - V) for 429, 442, and 427 stars are observed in the directionsof the anticenter, Cygnus, and the NGP, respectively, and DDO colors forthose stars G0 and later. The samples observed are ones for whichSandage and Fouts (1987) have published radial velocities. W, V, and Wcomponents of space velocity are derived from DDO distances withavailable proper motions. A clear correlation was found to exist betweenthe velocity dispersions and Fe/H with the dispersions decreasing asFe/H increases to about + 0.00, where V then becomes significantlynegative. The 'thick disk' component is clearly recognized, with sigma(W) approximately equal to 36 km/sec. In the 'old thin disk' and the'young thin disk', 43 percent and 42 percent of the stars have negativeV values, respectively.
| 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.
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תצפית ומידע אסטרומטרי
| קבוצת-כוכבים: | שור |
| התרוממות ימנית: | 05h27m43.89s |
| סירוב: | +24°19'56.9" |
| גודל גלוי: | 9.352 |
| תנועה נכונה: | 28.7 |
| תנועה נכונה: | -40.1 |
| B-T magnitude: | 10.195 |
| V-T magnitude: | 9.422 |
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