Search Publications
Cross-correlation characteristics of OB stars from IUE spectroscopy
Howarth, Ian D.; Prinja, Raman K.; Siebert, Kaj W. +1 more
We present a catalogue of homogeneous measures of the linewidth parameter, v_esin i, for 373 O-type stars and early B supergiants (including the separate components of 25 binary and three triple systems), produced by cross-correlating high-resolution, short-wavelength IUE spectra against a `template' spectrum of tauSco. We also tabulate terminal v…
EUVE J0317-855: a rapidly rotating, high-field magnetic white dwarf
Christian, D. J.; Wickramasinghe, D. T.; Vennes, S. +2 more
Spectropolarimetric observations of the extreme-ultraviolet (EUV) source and high-field magnetic white dwarf EUVE J0317-855 (=RE J0317-853) in the wavelength range 4200-7200 A reveal a strongly structured circular polarization spectrum with a peak polarization of 8 per cent. The strongest features in the polarization spectrum are attributed to Hα …
A multiwavelength study of the Seyfert 1 galaxy MCG-6-30-15
Fabian, A. C.; Reynolds, C. S.; Celotti, A. +1 more
We present a multiwaveband spectroscopic study of the nearby Seyfert 1 galaxy MCG-6-30-15. New optical spectra from the Anglo-Australian Telescope are presented which clearly show the effects of dust extinction/reddening on both the emission-line spectrum and the non-stellar AGN continuum. The reddening is constrained to be in the range E(B-V)=0.6…
The WC10 central stars CPD-56 deg8032 and He 2-113 - I. Distances and nebular parameters
Barlow, M. J.; De Marco, Orsola; Storey, P. J.
We present the results of an analysis of the WC10 central stars CPD-56 deg8032 and He 2-113 and of their surrounding planetary nebulae (PNe). UCL Echelle Spectrograph spectra with a resolving power of R=50 000, covering the wavelength range 3600-9500 A, were obtained for both objects. Expansion and radial velocities are derived from the nebular Ba…
Elemental abundances for Nova V693 Coronae Austrinae 1981
Shore, Steven N.; Starrfield, Sumner; Vanlandingham, Karen M.
We present an analysis of the UV spectra of the fast ONeMg nova V693 Coronae Austrinae 1981. Observations with IUE began on 1981 April 10 and continued until 1981 November 14. We find the reddening for the nova to be E(B-V)~=0.2+/-0.1. Using the photoionization code cloudy90.02 and the minimization routine minuit, we derive elemental abundances fo…
A search for hidden white dwarfs in the ROSAT extreme ultraviolet survey
Barstow, M. A.; Burleigh, M. R.; Fleming, T. A.
The ROSAT Wide Field Camera survey has provided us with evidence for the existence of a previously unidentified sample of hot white dwarfs (WDs) in non- interacting binary systems, through the detection of extreme ultraviolet (EUV) and soft X-ray emission. These stars are hidden at optical wavelengths because of their close proximity to much more …
A photometric and spectroscopic study of the symbiotic binary BFCyg
Bode, M. F.; Errico, L.; Vittone, A. +3 more
We present the historical 1890-1996 photographic/B-band light curve of the symbiotic binary BF Cyg for the first time. It displays three types of eruption: (i) a slow, symbiotic nova outburst (1895-1960), probably caused by a thermonuclear event; (ii) short-term flares dependent on the orbital phase, possibly triggered by accretion events, and (ii…
The high-excitation planetary nebula NGC 6741
Hyung, Siek; Aller, Lawrence H.
The compact, bright Peimbert type I planetary nebula NGC 6741 shows an unusually rich spectrum which is studied here from 3700 to 10 370 A with the Hamilton Echelle spectrograph at the Lick Observatory. By combining Hamilton Echelle observations with archive UV data secured with the International Ultraviolet Explorer (IUE), and with available IR d…
EK TrA, a close relative of VW HYI
Gänsicke, B. T.; Beuermann, K.; Thomas, H. -C.
The southern dwarf nova EK TrA has been suggested to show the spectrum of its white dwarf primary in the single available International Ultraviolet Explorer (IUE) post-outburst spectrum. We demonstrate that this spectrum is still disc-dominated. However, a careful analysis reveals a white dwarf contribution of ~25 per cent of the SWP flux and a wh…
The nature of the broad-line region in the radio-loud active galactic nucleus 3C 390.3
Schartel, Norbert; Wamsteker, Willem; Wang, Ting-Gui +1 more
We present the results of an analysis of the ultraviolet and X-ray variability of the broad-line radio (BLR) galaxy 3C 390.3 over 15 years. The ultraviolet (UV) continuum of 3C 390.3 shows large variations with amplitudes of up to a factor of 10. We find the following results. (1) The variations of Civ and Lyalpha are highly correlated with the UV…