Search Publications
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…
Plasma diagnostics of active-region evolution and implications for coronal heating
Mathioudakis, M.; Bloomfield, D. S.; Keenan, F. P. +2 more
A detailed study is presented of the decaying solar-active region NOAA 10103 observed with the Coronal Diagnostic Spectrometer (CDS), the Michelson Doppler Imager (MDI) and the Extreme-ultraviolet Imaging Telescope (EIT) onboard the Solar and Heliospheric Observatory (SOHO). Electron-density maps formed using SiX (356.03 Å/347.41 Å) show that the …
The Interplanetary Network Supplement to the BATSE Catalogs of Untriggered Cosmic Gamma-Ray Bursts
Frontera, F.; Cline, T.; Hurley, K. +16 more
We present Interplanetary Network (IPN) detection and localization information for 211 gamma-ray bursts (GRBs) observed as untriggered events by the Burst and Transient Source Experiment (BATSE) and published in catalogs by Kommers et al. and Stern et al. IPN confirmations have been obtained by analyzing the data from 11 experiments. For any given…
UV/Optical Nuclear Activity in the gE Galaxy NGC 1399
Crane, Jeffrey D.; O'Connell, Robert W.; Burstein, David +5 more
Using HST STIS, we have detected far-ultraviolet nuclear activity in the giant elliptical galaxy NGC 1399, the central and brightest galaxy in the Fornax I cluster. The source reached a maximum observed far-UV luminosity of ~1.2×1039 ergs s-1 in 1999 January. It was detectable in earlier HST archival images in 1996 (B band) b…
Swift, INTEGRAL, RXTE, and Spitzer Reveal IGR J16283-4838
Gehrels, N.; Rodriguez, J.; Mowlavi, N. +9 more
We present the first combined study of the recently discovered source IGR J16283-4838 with Swift, INTEGRAL, and RXTE. The source, discovered by INTEGRAL on 2005 April 7, shows a highly absorbed [variable NH=(0.4-1.7)×1023 cm-2] and flat (Γ~1) spectrum in the Swift XRT and RXTE PCA data. No optical counterpart is de…
HST and UKIRT imaging observations of z~ 1 6C radio galaxies - II. Galaxy morphologies and the alignment effect
Röttgering, H. J. A.; Inskip, K. J.; Best, P. N. +1 more
Powerful radio galaxies often display enhanced optical/ultraviolet emission regions, elongated and aligned with the radio jet axis. The aim of this series of papers is to investigate separately the effects of radio power and redshift on the alignment effect, together with other radio galaxy properties. In this second paper, we present a deeper ana…
Mid-IR spectro-imaging observations with the ISOCAM CVF: Final reduction and archive
Blommaert, J. A. D. L.; Boulanger, F.; Abergel, A. +6 more
Mid-IR (5-17~µm) Spectro-Imaging observations towards several hundred sky positions were obtained with the Infrared Space Observatory Camera (ISOCAM), and a Circular Variable Filter (CVF) that provided spectral resolution R = λ/Δ λ ~ 45 over a 3' × 3' field (for 6, and 12´´ pixels, proportionally smaller for the observations carried with the…