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The Properties of the Local Interstellar Medium and the Interaction of the Stellar Winds of epsilon INDI and lambda Andromedae with the Interstellar Environment
Wood, Brian E.; Linsky, Jeffrey L.; Alexander, William R.
We present new observations of the Lyα lines of ɛ Indi (KS V) and λ Andromedae (G8 IV-III + ?). These data were obtained by the Goddard High Resolution Spectrograph (GHRS) on the Hubble Space Telescope. Analysis of the interstellar H I and D I absorption lines reveals that the velocities and temperatures inferred from the H I lines are inconsisten…
The Hubble Space Telescope Quasar Absorption Line Key Project: The Unusual Absorption-Line System in the Spectrum of PG 2302+029---Ejected or Intervening?
Savage, B. D.; Boksenberg, A.; Sargent, W. L. W. +9 more
We report the discovery of a high-ionization broad absorption line system at a redshift of zabs = 0.695 in the spectrum of the zem = 1.052 radio-quiet quasar PG 2302+029. Broad absorption with FWHM from 3000 to 5000 km s-1 is detected from C IV, N V, and O VI in Hubble Space Telescope (HST) Faint Object Spectrograph spectra of the quasar. A narrow…
ISOCAM observations of low-luminosity young stellar objects in the Chamaeleon dark clouds.
Prusti, T.; Perault, M.; Olofsson, G. +19 more
We report the first results from an ISOCAM survey for low-luminosity, young stellar objects (YSOs) in nearby star formation regions. The present Letter concerns three regions within the Chamaeleon dark clouds, with a total area coverage of ~0.8 square degrees, representing 35% of the presently approved survey programme. The survey is conducted in …
Multiwavelength Data Suggest a Cyclotron Feature on the Hot Thermal Continuum of Geminga
Bowyer, Stuart; Caraveo, Patrizia A.; Bignami, Giovanni F. +2 more
A new set of ground-based optical, HST, UV, and EUVE data on Geminga are presented. The object, identified with a high proper motion isolated neutron star (INS), is seen to emit thermal radiation with a temperature in the range (2.2--2.8) x 105 K. This is compatible with the global thermal emission from the surface of a standard neutron star of Ge…
The Host Galaxies of IRAS-selected Quasi-stellar Objects
Boksenberg, A.; Macchetto, F. D.; Crane, P. +6 more
We present Hubble Space Telescope (HST) images of three QSOs selected on the basis of their IRAS properties. The data were taken with the Planetary Camera primarily in order to examine the host galaxies. All three QSOs appear embedded in spectacular interactions between two or more luminous galaxies, probably spirals. We discuss the evolutionary c…
X-Ray Emission from the Wind-blown Bubble in the Planetary Nebula BD +30 degrees 3639
Borkowski, Kazimierz J.; Arnaud, Keith; Harrington, J. Patrick
An X-ray spectrum of a wind-blown bubble in the planetary nebula BD +30 deg3639, acquired by the Advanced Satellite for Cosmology and Astrophysics (ASCA), shows the presence of hot (T = 3 x 106 K) gas dominated by the Ne K alpha line complex. There is circumstantial evidence for the enhanced abundances of other H- and He-burning products, although…
The behaviour of the excess CA II H and K and Hɛ emissions in chromospherically active binaries.
Montes, D.; Fernandez-Figueroa, M. J.; de Castro, E. +1 more
In this work we analyze the behaviour of the excess Ca II H and K and Hɛ emissions in a sample of 73 chromospherically active binary systems (RS CVn and BY Dra classes), of different activity levels and luminosity classes. This sample includes the 53 stars analyzed by Fernandez-Figueroa et al. (1994) and the observations of 28 systems described by…
The Flagstaff Astrometric Scanning Transit Telescope (FASTT) and Star Positions Determined in the Extragalactic Reference Frame
Monet, Alice K. B.; Monet, David G.; Stone, Ronald C. +2 more
This paper describes the methods used for determining star positions in the extragalactic reference frame with the Flagstaff astrometric scanning transit telescope (FASTT) from drift scan observations. A laser metrology system is used to correct for instrumental motions, and detailed numerical computations are made for atmospheric and room refract…
The rich far-infrared water vapour spectrum of W Hya.
Walker, H. J.; Omont, A.; Burgdorf, M. +40 more
We present an ISO Long Wavelength Spectrometer (LWS) grating spectrum of the oxygen-rich AGB star W Hya from 43-197µm. The spectrum is dominated by a forest of water vapour emission lines, confirming that H_2_O molecules are the dominant coolants of the winds of these stars. We have constructed an outflow model for the H_2_O spectrum of W Hy…
Hubble Space Telescope Observations of Oxygen-Rich Supernova Remnants in the Magellanic Cloud. I. Narrow-Band Imaging of N132D in the LMC
Kirshner, R. P.; Raymond, J. C.; Long, K. S. +6 more
We present Hubble Space Telescope (HST WFPC2 images of the young, oxygen- rich supernova remnant N132D in the Large Magellanic Cloud in the [O III]λ5007, [O II]λ3727 and [S II]λλ6724 emission lines, plus a visible continuum band. The ~0.1" resolution of HST allows us to analyze structure within N132D at scales comparable to ground-based images of …