Search Publications
IUE ultraviolet observations of narrow absorption components in the spectrum of dzeta Puppis.
Prinja, R. K.
Detailed IUE ultraviolet observations of multiple absorption components, observed superimposed on the Si IV λλ1393.76, 1402.77 P Cygni resonance line doublet in the O4ef star ζ Puppis, are presented. These components are observed in 16 out of 21 spectra at ≡0.75 and 0.82 of the terminal velocity over a period of three years up to 1981 and are stat…
Optical and ultraviolet study of five stars in the Pleiades open cluster
Dufton, P. L.; Younan, K. F.
Optical and ultraviolet observations of five low-reddened stars in the Pleiades open cluster have been obtained with an echelle spectrograph and the IUE satellite. The observed interstellar absorption lines have been analysed with different cloud models to estimate interstellar gas abundances for each line-of-sight. These results have been discuss…
Interstellar CO in the direction of the runaway star AE Aurigae.
Nandy, K.; McLachlan, A.
The detection of absorption by interstellar (C-12)(O-16) in a high-dispersion IUE spectrum of AE Aur is reported. Relative to an estimated total hydrogen column density of about 21.62 in the line-of-sight, the measured CO column density of 14.76 + or - 0.10, is consistent with the theoretical model of Federman et al. (1980) for gas-phase chemistry…
Correlation of gamma-ray fluxes with southern hemisphere CO data.
Manchester, R. N.; Wolfendale, A. W.; Whiteoak, J. B. +3 more
A new radio survey of the C-12O molecule in the Galactic plane covering the longitude range l:294 - 358 deg is compared with the flux of high energy gamma rays in the same region. A good correlation between the two is found, and it is shown that the data are consistent with the hypothesis that most of the gamma-ray flux is produced by the cosmic-r…
IUE observations of high velocity gas towards the M 16 nebula.
Welsh, B. Y.
The star HD 168183, which is part of the giant H II region-molecular cloud complex of M16 (NGC 6611), has been observed at high resolution using the IUE satellite. High velocity interstellar absorption components have been detected at velocities of -83, -38 and +40 km s-1 and it is proposed that a stellar wind-driven shock-front, intera…
IUE and other new observations of the slow nova RR Tel.
Penston, M. V.; Jordan, C.; Macchetto, F. +8 more
IUE satellite UV spectra of RR Tel covering 1150-3200 A at high and low dispersion through both large and small apertures are reported, and a list of 431 lines is presented which gives measured wavelength, intensity, and full width at half maximum. Over three-quarters of the lines are identified, and a correlation is noted between line width and i…
Extreme variability in the Be-type, periodic recurrent X-ray transient AO538-66 : a highly eccentric interacting binary.
Howarth, I. D.; Charles, P. A.; Willis, A. J. +6 more
The recurrent X-ray transient sources represent a substantial class of galactic objects which are difficult to study extensively. They can be divided into two groups on the basis of their optical primaries, including the low-mass systems which are optically faint outside their outbursts, and those with high masses. White and Carpenter (1978) disco…
Ultraviolet and optical observations of the dwarf novae VW and WX Hydri during outburst.
Schwarzenberg-Czerny, A.; Pringle, J. E.; Wade, R. A. +3 more
Simultaneous spectrophotometry is presented in the range 1200-7000 A of the dwarf novae, at quiescence and maximum. The continuum spectra are compared with the standard model disk spectrum and, with one exception, the fit is poor. The assumptions that the disk is both steady-state and blackbody are reconsidered, and it is pointed out that a nu to …
A study of the low-mass X-ray binary HZ HER/HER X-1 using IUE and optical data.
Howarth, I. D.; Wilson, B.
An extensive body of uniformly extracted IUE spectrophotometry of HZ Her/Her X-l is presented. To interpret these data a light-curve synthesis model comprising a distorted, X-ray heated primary accompanied by an accretion disc is developed. Roche geometry is used for the star, and the X-ray shadow thrown by the disc accounted for. The model's para…
MR 2251-178 : a nearby QSO embedded in a giant H II envelope.
Tarenghi, M.; Boksenberg, A.; Bergeron, J. +1 more
Spectra of MR 2251-178 and surrounding galaxies were obtained and analyzed. The kinematics of the extended region, the spectra of the QSO and nebulosity, and the galaxies of the surrounding cluster are discussed. The QSO lies in the nucleus of a galaxy having a gaseous component of very high ionization, high temperature and relatively low abundanc…