Search Publications
A search for previously unrecognized metal-poor subdwarfs in the Hipparcos astrometric catalogue
Reid, I. Neill; Kilkenny, D.; Marang, F. +3 more
We have identified 317 stars included in the Hipparcos astrometric catalogue that have parallaxes measured to a precision of better than 15 per cent, and the location of which in the (MV,(B-V)T) diagram implies a metallicity comparable to or less than that of the intermediate-abundance globular cluster M5. We have undertaken …
Cosmic-ray Composition as Observed by Ulysses
Connell, James J.
The cosmic ray isotopic composition measurements from the High Energy Telescope (HET) on the Ulysses spacecraft are reviewed. The source isotopic composition of key elements is found to be surprisingly like the Solar system abundances with the notable exception of ^22Ne. The average density of interstellar material cosmic rays traverse is found to…
STIS and GHRS Observations of Warm and Hot Gas Overlying the Scutum Supershell (GS 018-04+44)
Sembach, Kenneth R.; Savage, Blair D.; Howk, J. Christopher
We present Space Telescope Imaging Spectrograph (STIS) and Goddard High Resolution Spectrograph (GHRS) observations of interstellar UV absorption toward HD 177989, a B0 III star at 4.9 kpc in the direction l=17.8d, b=-11.9d. The line of sight passes through the high-latitude ejecta of the Scutum supershell (GS 018-06+44), which is ~5° in diameter …
H2, HD, and CO at the edge of 30 Dor in the LMC: The line of sight to Sk-69 246
de Boer, K. S.; Bluhm, H.
FUSE and IUE observations of
XMM-Newton EPIC observation of SMC SNR 0102-72.3 EPIC Observation of SMC SNR 0102-72.3
Haberl, F.; Filipović, M. D.; Sasaki, M. +2 more
Results from observations of the young oxygen-rich supernova remnant
Cygnus X-3 with ISO: investigating the wind
Fender, R. P.; Ogley, R. N.; Bell Burnell, S. J.
We have observed the energetic binary Cygnus X-3 in both quiescent and flaring states between 4 and 16µm using the ISO satellite. We find that the quiescent source shows the thermal free-free spectrum typical of a hot, fast stellar wind, such as from a massive helium star. The quiescent mass-loss rate arising from a spherically symmetric, no…
Ultraviolet Spectrophotometry of Variable Early-Type Be and B Stars Derived from High-Resolution IUE Data
Smith, Myron A.
High-dispersion IUE data encode significant information about aggregate line absorptions that cannot be conveniently extracted from individual stellar spectra. Here we apply a new technique in which fluxes from each echelle order of a short-wavelength IUE spectrum are binned together to construct low-resolution spectra of a rapidly varying B or Be…
First Detections of Molecular Gas Associated with the Wolf-Rayet Ring Nebula NGC 3199
Marston, A. P.
This paper presents the first observations of molecular gas associated with the Wolf-Rayet ring nebula NGC 3199 around the WR star WR 18. This includes first observations of the molecules HCN, HCO+, CN, and HNC seen in any Wolf-Rayet ring nebula. Our observations immediately suggest the presence of high-density molecular gas (>10
UV spectra of T Tauri stars from the HST and IUE satellites: BP Tau
Vittone, A. A.; Errico, L.; Lamzin, S. A.
Ultraviolet spectra of BP Tau observed with HST/GHRS and IUE satellites were analysed. We found that BP Tau activity can be explained in the frame of a disk accretion model if we assume that the stellar magnetic axis is strongly inclined to the disk plane. The following set of accretion process parameters were derived: relative surface area of the…
Search for a Near-Infrared Counterpart to the Cassiopeia A X-Ray Point Source
Kulkarni, S. R.; Kaplan, D. L.; Murray, S. S.
We report deep near-infrared and optical observations of the X-ray point source in the Cassiopeia A supernova remnant, CXO J232327.9+584842. We have identified a J=21.4+/-0.3 mag and a Ks=20.5+/-0.3 mag source within the 1 σ error circle, but we believe this source is a foreground Population II star with Teff=2600-2800 K at a…