Search Publications
International Ultraviolet Explorer observations of the R AQR jet.
Kafatos, M.; Michalitsianos, A. G.
Ultraviolet spectra were obtained with the International Ultraviolet Explorer of the newly discovered optical-radio jet feature in the symbiotic variable R Aquarii. The far-UV continuum of the jet is characterized by strong continuum which rises with decreasing wavelength in the 1200-2000 A wavelength range and is considerably different in appeara…
Active stars and systems
Rodono, M.
The most notable manifestations of stellar activity are reviewed with particular emphasis on the merging picture of solar-type activity in physical conditions different from those in the Sun. Evidence for starspots, plages and high-level coronal emissions is presented from observations covering a wide range of spectral bands: from X-ray to radio w…
Ly-alpha absorption at a high velocity in NGC1275
Boksenberg, A.; Snijders, M. A. J.; Briggs, S. A.
The results of a study of three spectra of the peculiar galaxy NGC1275 obtained with the SWP camera aboard the IUE satellite are reported and discussed. The absorption feature identified with Ly-alpha at 8200 km/s was clearly seen in all three spectra. The origin of this feature is attributed to the intervening galaxy responsible for the high velo…
MGII H and K line observations of del SCT variables.
Fracassini, M.; Pasinetti, L. E.
IUE observations of seven Delta Scuti variables and a comparison star are reported with a comparison of the Mg II h and k lines to those of previously observed normal stars. Evident chromospheric emission is observed in three Delta Scuti variables: tau Cyg, beta Cas and rho Pup. Possible emissions are suggested for omega-1 Eri (F2III), iota Cyg, t…
Further VBLUW photometry of the S DOR type variables S DOR and HDE 269006 in the LMC and a discussion on their temperatures.
van Genderen, A. M.
New VBLUW photometry of the S Dor type variables S Dor and HDE 269006 in the LMC made in 1979 and 1981 are discussed. S Dor has reached the lowest brightness in 1981 of the last 8 yr, but it is still far from the minimum. HDE 269006 was at minimum brightness. Temperatures are estimated for the central star and the envelope by fitting black body en…
Effective temperatures and radii of Large Magellanic Cloud supergiants.
Nandy, K.; Willis, A. J.; Wilson, R. +3 more
The absolute fluxes and flux distributions of 25 Large Magellanic Cloud supergiants are compared to those of similar galactic stars. The effective temperatures and radii of the LMC stars are found by comparison with models. No significant difference between the LMC and our Galaxy is found.
The interstellar absorption-line spectrum of mu. Oph.
Boehm-Vitense, E.; Cardelli, J.
UV interstellar lines have been measured on high-resolution, long- and short-wavelength IUE spectra of the B8 V star Mu Oph. Column densities for the observed atoms and ions have been determined as well as turbulent velocities. The interstellar spectrum of Mu Oph is similar to the ones for Rho Oph and Zeta Oph. The ionization equilibria of several…
The UV spectrum of the old nova HR Del at differentorbital phases.
Friedjung, M.; Puget, P.; Andrillat, Y.
Observations of the old nova HR Del with IUE are used to obtain a dereddened continuum energy distribution, which is close to that of a classical accretion disk of Lynden-Bell. A very high accretion rate of 0.000001 solar mass/yr is derived from this distribution. The variations of line and continuum fluxes with orbital phase are examined. They ca…
Detection of the 1400 angstrom absorption in the ultraviolet spectrumof the DA white dwarf LB 3303.
Wegner, G.
Low-resolution ultraviolet International Ultraviolet Explorer spectra of the southern white dwarf LB 3303 show the presence of the wavelength 1400 absorption feature reported by Greenstein in the spectrum of 40 Eri B. The equivalent width is 5.7 A, and the measured wavelength is 1394 A. A comparison of the ultraviolet fluxes with model atmospheres…
IUE observations of the X-ray burst source 4U/MXB 1735-44.
van Paradijs, J.; Hammerschlag-Hensberge, G.; McClintock, J. E.
The ultraviolet (1250-1950 A) energy distribution of the X-ray burst source 4U/MXB 1735-44 has been observed with the International Ultraviolet Explorer. The source was detected with an average flux of 1.1 x 10 to the -15th ergs/sq cm per sec per A. The similarity of the optical energy distribution of this source to that of Sco X-1 extends into th…