28,558 datasets found

We use new VLA Galactic plane catalogs at 5 and 1.4 GHz covering the first Galactic quadrant (350{deg}<=l<=42{deg}, |b|<=0.4{deg}) in conjunction with the MSX6C...

We present monitoring observations by the Rossi X-Ray Timing Explorer of the 2-10keV X-ray emission from the supermassive star {eta} Carinae from 1996 through late 2003. These...

We present an abundance analysis for stars within 15pc of the Sun located north of -30{deg} declination. We have limited our abundance sample to absolute magnitudes brighter...

We present 6151 differential observations in the V filter measured by a robotic telescope, as well as 29 pairs of radial velocities from high-resolution spectroscopic...

We present 5064 differential observations in the V filter measured by a robotic telescope, as well as 30 pairs of radial velocities from high-resolution spectroscopic...

We present 4179 differential observations in the V filter measured by a robotic telescope, as well as 25 pairs of radial velocities from high-resolution spectroscopic...

We have previously conducted a search for X-ray sources coincident with white dwarfs using the white dwarf catalog compiled by McCook & Sion (1999, Cat. , ) and the ROSAT...

The completeness of USNO-B detections of high proper motion ({mu}>180mas/yr) stars is tested, and the accuracy of its measurements is compared to the revised New Luyten...

Based on the Hipparcos and Tycho-2 astrometric catalogs and the ROSAT surveys, a sample of ~100 stars most luminous in X-rays within or around a distance of 50 pc is culled. The...

We present an analysis of NICMOS observations of the embedded cluster associated with NGC 2024. An analysis of the cluster color-magnitude diagram (CMD) using the models of...

The proper motions (tangential velocities) of Herbig-Haro (HH) objects in the Orion Nebula were measured with a +/-10km/s accuracy using the Hubble Space Telescope Wide Field...

Using the ESO 2.2m telescope with the 8Kx8K mosaic CCD, we have surveyed 2.8deg^2^ (~1.6{deg}x1.7{deg}) of the Small Magellanic Cloud (SMC) to search for faint planetary nebulae...

Two hundred forty-two members of the Praesepe and alpha Persei clusters have been surveyed with high angular resolution 2.2{mu}m speckle imaging on the 3m Infrared Telescope...

Orbital elements are presented for 117 binary systems with no previous orbit calculation. For nearly all of these systems, these elements must be regarded as preliminary, but...

We have obtained a deep (53 ks) X-ray image of the very young stellar cluster IC 348 with the Advanced CCD Imaging Spectrometer on board the Chandra X-Ray Observatory. In our...

Globular clusters at the distance of M31 have apparent angular sizes of a few arcseconds. While many M31 globular clusters have been detected and studied from ground-based...

As part of our ongoing program of predictions and observations of stellar occultations by solar system bodies, we have completed a search for candidates for occultations by...

The Flagstaff Astrometric Scanning Transit Telescope was used to scan the sky in search of occultation candidates through which the Centaur 10199 Chariklo (formerly 1997 CU_26_)...

We present photometric observations in B and V as well as spectroscopic observations of the 1.9 day-period, double-lined main-sequence eclipsing binary FS Mon. From the analysis...

A comprehensive census of the stellar content of the OB associations within 1 kpc from the Sun is presented, based on Hipparcos positions, proper motions, and parallaxes. It is...