Search Publications
The infrared counterpart of the Z source GX 5-1
van der Klis, M.; Hambly, N. C.; Fender, R. P. +1 more
We have obtained UK Infrared Telescope infrared observations of the field of the bright Galactic Z source GX 5-1. From an astrometric plate solution tied to Tycho-ACT standards we have obtained accurate positions for the stars in our field which, combined with an accurate radio position, have allowed us to identify the probable infrared counterpar…
The protostellar system HH108MMS
Siebenmorgen, R.; Krügel, E.
We probe the region around the protostar HH108MMS by deep mid infrared photometric and polarimetric imaging. The protostar is detected at 14mu m in absorption against the diffuse background. Next to HH108MMS, we find a second absorbing core, named Q1, and the young stellar object IRAS18331-0035 which is more advanced in its evolution and already s…
The active binary star II Pegasi with it BeppoSAX
Covino, S.; Tagliaferri, G.; Mewe, R. +2 more
Subaru First-Light Deep Photometry of Galaxies in A 851 Field
Kobayashi, Naoto; Terada, Hiroshi; Usuda, Tomonori +96 more
We report on the results of optical and near-infrared photometry of the cluster of galaxies A 851 (=CL 0939+4713) carried out as one of the first-light observations of the 8.2 m Subaru telescope on Mauna Kea. Images as sharp as 0.''3 FWHM in K' and 0.''45 in R were obtained in these observations. The 3 sigma limiting magnitudes for points sources …
Windows Through the Dusty Disks Surrounding the Youngest Low-Mass Protostellar Objects
Cernicharo, J.; González-Alfonso, E.; Noriega-Crespo, A. +5 more
The formation and evolution of young low-mass stars are characterized by important processes of mass loss and accretion occurring in the innermost regions of their placentary circumstellar disks. Because of the large obscuration of these disks at optical and infrared wavelengths in the early protostellar stages (class 0 sources), they were previou…
CLASS B0827+525: `Dark lens' or binary radio-loud quasar?
Pearson, T. J.; Blandford, R. D.; Hoekstra, H. +12 more
We present radio, optical, near-infrared and spectroscopic observations of the source B0827+525. We consider this source as the best candidate from the Cosmic Lens All-Sky Survey (CLASS) for a `dark-lens' system or binary radio-loud quasar. The system consists of two radio components with somewhat different spectral indices, separated by 2.815 arc…
The search for YSOs from ISOGAL data. Application to the l = +45 field
Felli, M.; Omont, A.; Testi, L. +2 more
The 7 and 15 mu m observations of the Galaxy obtained by the ISOGAL program offer an unique possibility to investigate and separate the different populations of stars in the Galactic Plane, in particular to study the population of low flux density YSOs which could not be detected with IRAS. Considering the results obtained by ISOCAM in nearby star…
Measuring Magnetic Oscillations in the Solar Photosphere: Coordinated Observations with MDI, ASP and MWO
Ulrich, R. K.; Norton, A. A.
A comprehensive observing effort was undertaken to simultaneously obtain full Stokes profiles as well as longitudinal magnetogram maps of a positive plage region on 8 December, 1998 with the Michelson Doppler Imager, the Advanced Stokes Polarimeter and Mt. Wilson Observatory magnetograph. We compare 1.2'' spatially-averaged signals of velocities a…
ISO detection of a 60 mu m source near GRB 970508
Altieri, B.; Piro, L.; Palazzi, E. +18 more
The Infrared Space Observatory observed the field of the gamma -ray burst GRB 970508 with the CAM and PHT instruments on May 21 and 24, 1997 and with PHT in three filters in November 1997. A source at 60 mu m (flux in May of 66+/- 10 mJy) was detected near the position of the host galaxy of this gamma -ray burst. The source was detected again in N…
A study of opacity in SOHO-SUMER and SOHO-CDS spectral observations. I. Opacity deduction at the limb
Harrison, R. A.; Landini, M.; Innes, D. E. +9 more
A study is presented of the optical thickness of spectral lines of carbon, nitrogen and oxygen ions in the quiet sun. The observations consist of cross limb scans by the SUMER and CDS spectrometers on the SOHO spacecraft. A maximum likelihood spectral line fitting code has been adapted to analyse the multiplet profiles and to provide an assessment…