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IUE observations of the clusters of the Magellanic clouds.
Rich, R. M.; Persson, S. E.; Cohen, J. G.
IUE observations of 17 clusters in the Large Magellanic Cloud are presented. The derived ultraviolet colors become progressively redder as the cluster's classification in the scheme of Searle, Wilkinson, and Bagnuolo increases. With the aid of theoretical models of the integrated light of coeval clusters of varying ages, it is shown that the SWB c…
The EXOSAT imaging X-ray detectors.
Culhane, J. L.; Branduardi-Raymont, G.; Corbet, R. H. D. +3 more
The detection of the F1 IIu-X1 +g system of diatomic carbon toward X Persei.
Lien, D. J.
The 0-0 vibrational band of the F1Pi(u)-X1Sigma(+)g electronic system of C2 has been detected with the IUE in the interstellar medium along the line of sight toward X Per. A column density of 3 (+ or - 1) x 10 to the 12th/f(00) per sq cm was derived by a profile fitting method. The lower limit for 0-0 band oscillator strength was determined from a…
Sigma Geminorum (K1 III + ?) : variability of the ultraviolet emission lines near conjunction.
Linsky, J. L.; Simon, T.; Ayres, T. R.
Far-ultraviolet IUE echelle spectra are reported of the moderate-period RS CVn system σ Geminorum. Despite the location of the red giant primary of σ Gem in a portion of the H-R diagram where cool stellar winds are common, no evidence is found for circumstellar absorption features or blueward asymmetries in the chromospheric O I emission cores. Ho…
X Cygni : duplicity, period stability and atmospheric velocity structure.
Evans, N. R.
Observations of X Cygni which can be used as tests of duplicity are discussed, including light variations, ultraviolet spectra, radial velocities, and period variations. IUE observations show no sign of a blue companion in the 2500-3000 A region, ruling out a single companion more massive than about 2.5 solar masses. The high luminosity of X Cygni…
Optical photometry and UV spectroscopy of the flare star GL 735 (=V1285 Aql).
Doyle, J. G.; Butler, C. J.; Byrne, P. B. +1 more
The authors present optical photometry of flares and possible spot variations on the star Gl 735. Consideration of the energetics of the optical flares suggests that the star may be underactive when compared to other flare stars of the same spectral type. This conclusion is not supported however by an estimate of the radiative loss rate from the l…
A study of the Herbig Ae-type stars UX Ori and CD -44°3318 based on IUE spectra, and on visual and infrared photometry.
Djie, H. R. E. Tjin A.; Remijn, L.; Thé, P. S.
Far ultraviolet spectra of the two Herbig Ae stars UX Ori and CD -44°3318 are used to derive spectral types A2 III for UX Ori, and A0 - 1 III for CD -44°3318. The spectral energy distributions are in agreement with that of a Kurucz model with Teff = 9500K and log g = 4.0. In the near infrared both stars have a large excess of radiation,…
The nature of radio-quiet QSO's VLA observations of 0026+129, 0205+024 and 1351+640.
Sitko, M. L.; Rudnick, L.; Stein, W. A.
VLA maps of 'radio-quiet' QSOs are reported. Extended emission is found on linear scales of about 10 kpc, larger than that observed in Seyfert galaxies, but smaller than most radio-loud objects. The spectral properties of some radio-quiet objects are also very similar to those of radio-quiet Seyfert galaxies such as NGC 4151; some radio-quiet QSOs…
An analysis of V861 SCO - II. The stellar wind.
Howarth, I. D.
V861 Sco (= HD 152667) is a close binary with an early-type primary at one time suspected of having a compact (black hole) companion. It is now known that the system comprises a lobe-filling B0Ia star with a B2V secondary. It is pointed out that mass loss from the primary via its stellar wind is of considerable interest, since few close binaries h…
Ultraviolet spectroscopy of the planetary nebula in the Fornax galaxy.
Gull, T. R.; Stecher, T. P.; Maran, S. P. +2 more
The planetary nebula in the Fornax dwarf spheroidal galaxy is carbon rich, according to calculations based on measurements of the 1909 A emission line doublet of semiforbidden C III obtained with the International Ultraviolet Explorer. The ratio N(C)/N(O) is approximately equal to 3.7, comparable to the largest reliably determined carbon/oxygen ra…