Search Publications
Missions
Journals
Publication Years
CLASS B0631+519: last of the Cosmic Lens All-Sky Survey lenses
Pearson, T. J.; McKean, J. P.; Blandford, R. D. +13 more
We report on the discovery of the new gravitational lens system CLASS B0631+519. Imaging with the Very Large Array, the Multi-Element Radio-Linked Interferometer Network (MERLIN) and the Very Long Baseline Array (VLBA) reveals a doubly imaged flat-spectrum radio core, a doubly imaged steep-spectrum radio lobe and possible quadruply imaged emission…
Out of the darkness: the infrared afterglow of the INTEGRAL burst GRB 040422 observed with the VLT
Covino, S.; D'Avanzo, P.; Campana, S. +15 more
Investigating the EGRET-radio galaxies link with INTEGRAL: The case of 3EG J1621+8203 and NGC 6251
Guainazzi, M.; Grenier, I. A.; Grandi, P. +10 more
The analysis of an INTEGRAL AO2 observation of the error contours of the EGRET source 3EG J1621+8203 is presented. The only source found inside the error contours for energies between 20 and 30 keV at 5σ detection significance is the FR I radio galaxy NGC 6251. This supports the identification of NGC 6251 with 3EG J1621+8203. The observed flux is …
Photographic observations of solar system bodies at the Engelhardt astronomical observatory
Rizvanov, N.; Nefedjev, Ju.
We describe a large database of photographic observations of Solar System bodies obtained at the Engelhadt Astronomical Observatory (EnAO). We give a brief description of the methods of observations and the accuracy of their reduction with the PPM and Tycho-2 catalogues. The photographic positions of the major planets, except Jupiter, are in the s…
Proper Motion of the Irradiated Jet HH 399 in the Trifid Nebula
Yusef-Zadeh, F.; Wardle, M.; Biretta, J.
HH 399 is one of the first Herbig-Haro flows recognized to be irradiated by the UV radiation of the massive O7.5 star in the Trifid Nebula. We present the proper motion of the first irradiated jet, based on two epochs of Hubble Space Telescope (HST) observations of HH 399 separated by nearly 5 yr, using Hα and [S II] line filters. High proper moti…
The Beagle 2 stereo camera system
Coates, A. J.; Josset, J. -L.; Pillinger, C. T. +6 more
The stereo camera system (SCS) was designed to provide wide-angle multi-spectral stereo imaging of the Beagle 2 landing site. Based on the Space-X micro-cameras, the primary objective was to construct a digital elevation model of the area in reach of the lander's robot arm. The SCS technical specifications and scientific objectives are described; …
Search for radiative pumping lines of OH masers. I. The 34.6 m absorption line towards 1612 MHz OH maser sources
Szczerba, R.; Sobolev, A. M.; Chen, P. S. +1 more
The 1612 MHz hydroxyl maser in circumstellar envelopes has long been thought to be pumped by 34.6 µm photons. Only recently, the Infrared Space Observatory has made possible spectroscopic observations which enable the direct confirmation of this pumping mechanism in a few cases. To look for the presence of this pumping line, we have searched…
X-Ray and Infrared Observations of Embedded Young Stars in NGC 2264
Simon, Theodore; Dahm, S. E.
Images of the NGC 2264 star-forming region, which we have acquired with the XMM-Newton spacecraft, reveal strong X-ray emission from three deeply embedded (AV>=10 mag) young stellar objects in the vicinity of Allen's infrared source (AFGL 989 = IRS 1) and Castelaz & Grasdalen's infrared source (RNO-EW = IRS 2). Thermal plasma mod…
Detection of a classical δ Scuti star in the new eclipsing binary system HIP 7666
García-Melendo, E.; Gómez-Forrellad, J. M.; Lampens, P. +4 more
HIP 7666 is a variable star newly discovered during the Hipparcos mission and classified as of unknown type (ESA 1997, The Hipparcos and Tycho Catalogues, ESA SP-1200). During 23 nights between July 2000 and November 2000, over 2300 CCD observations in the V band were obtained. These data show that the new variable is a detached eclipsing binary s…
Lifting the Iron Curtain: Toward an Understanding of the Iron Stars XX Oph and AS 325
Howell, Steve B.; Cool, Richard J.; Peña, Maria +2 more
We present new optical, near-infrared, and archival ultraviolet observations of XX Ophiuchi and AS 325, two proposed ``iron'' stars. These unusual stars have optical spectra dominated by emission lines arising from hydrogen, as well as ionized metals such as iron, chromium, and titanium. Both stars have been classified as ``iron'' stars, and a num…