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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…
Molecular gas and dust in NGC 4550. A galaxy with two counterrotating stellar disks
Henkel, C.; Wiklind, T.
We report the detection of 1 x 107 Msun of molecular gas in the central region of the S0/E7 galaxy NGC 4550, inferred from observations of CO(1-0) emission. Dust is detected in HST WFPC2 images and found to be asymmetrically distributed around the nucleus, only extending to a galactocentric distance of 7'' (600 pc). The shape…
The distance to Supernova 1998aq in NGC 3982
Gibson, Brad K.; Stetson, Peter B.
The distance to NGC 3982, host galaxy to the Type Ia supernova SN 1998aq, is derived using 32 Cepheids discovered in archival multi-epoch Hubble Space Telescope observations. Employing recent Large Magellanic Cloud Cepheid period-luminosity relations and absolute zero-point, we find a distance to NGC 3982 of [formmu3]20.5+/-0.8 (r) +/-1.7 (s)Mpc, …