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Analysis of the three high-velocity B stars HD 125924, 165955 and CPD-72 1184.
Tobin, W.; Kaufmann, J. P.
Optical and IUE observations are analyzed for three high radial velocity stars, HD 125924 (+252 km/s), HD 165955 (-160 km/s), and CPD-72 deg 1184 (-217 km/s). On account of their high velocities and no evidence of abnormal carbon and nitrogen abundances, the stars cannot be subluminous members of an old disc population. Magnesium and silicon level…
Physical conditions in the UV line emitting region of supernova 1979cin NGC 4321.
Panagia, N.; Fransson, C.; Reimers, D. +5 more
Ultraviolet observations of SN 1979c are used to derive the physical conditions in the line-forming regions. The emission lines have asymmetric profiles and large expansion velocities and are therefore formed in a narrow shell close to the photosphere having a constant velocity. The most likely mechanism for the excitation of these lines is photoi…
Dwarf novae in outburst : simultaneous ultraolet and optical observations of UZ Serpentis, RX Andromedae and AH Herculis.
Verbunt, F.; Schwarzenberg-Czerny, A.; Jones, D. H. P. +6 more
The authors present spectroscopic and photometric observations in the optical and ultraviolet wavelength regions made during outbursts of the three dwarf novae UZ Serpentis, RX Andromedae and AH Herculis. The observations do not cover the rapid initial rise to outburst, but rather the peak and the subsequent decline. The overall changes of the con…
IUE and ground-based observations of the Hubble-Sandage variables in M 31 and M 33.
Gull, T. R.; Humphreys, R. M.; D'Odorico, S. +2 more
Ultraviolet spectroscopy from the IUE, in combination with ground-based visual and infrared photometry, are used to determine the energy distributions of the luminous blue variables, the Hubble-Sandage variables, in M31 and M33. When corrected for interstellar extinction, the integrated energy distributions yield the total luminosities and blackbo…
Temporal and spatial behavior of the ultraviolet emissions of comet IRAS-Araki-Alcock 1983d
Feldman, P. D.; A'Hearn, M. F.; Millis, R. L.
The spatial distribution and temporal variation of the ultraviolet emissions from comet IRAS-Araki-Alcock 1983d, observed by IUE near closest approach of the comet to the earth, suggest a model for this comet of a rotating cometary nucleus with a nonuniform distribution of volatile ices. The short lifetime of S2 (about 500 s), a species whose pres…
Coordinated multifrequency observations of the BL Lacertae objects MRK 180 and MRK 501.
Kondo, Y.; Mushotzky, R. F.; Urry, C. M. +8 more
The continuous spectra of the nearby BL Lac objects Mrk 180 and Mrk 501 have been investigated by making coordinated observations at X-ray, ultraviolet, optical, and radio wavelengths. The observations were planned in order to obtain single-epoch snapshots, or time-frozen spectra, of the emission at many different wavelengths. The spectra were fit…
The ionization structure of planetary nebulae. IV. NGC 6853
Barker, T.
Upgraded UV and IR data were taken of the planetary nebula NGC 6853 in the same region as previous optical data to improve the data base on various ionized species in the nebula. The spectral range 1400-9600 A was scanned, and good agreement was obtained between UV and optical ionization abundance data, although the 4267 A C II line yielded a C(2+…
IUE observations of Centaurus X-4 during the 1979 May outburst.
Raymond, J. C.; Dupree, A. K.; Holm, A. V. +3 more
Ultraviolet spectrophotometry of the X-ray transient/burst source Centaurus X-4 at several intervals during the peak and decay of the May 1979 X-ray transient event was obtained. The spectrum was characterized by a blue continuum with alpha = 0.0 + or - 0.3 (F/nu/ varies as nu to the alpha power) and strong emission lines of N V lambda 1240, C IV …
A study of the Herbig Ae-type stars UX ORI and CD -44 3318 based on IUE spectra, and on visual and infrared photometry.
The, P. S.; Tjin A Djie, H. R. E.; Remijn, L.
The spectral classifications of the two Herbig Ae stars UX Ori and CD-44 deg 3318 are reconsidered. The far-UV spectra of the stars are both similar to those of early A-type supergiants; however, the spectral types A2 III and A0-1 III are here derived for the respective stars based on continuum shapes, absorption features, and distance arguments. …
Ultraviolet, optical and infrared observations of the Wolf-Rayet contact-eclipsing binary CQ Cephei.
Bromage, G. E.; Howarth, I. D.; Willis, A. J. +5 more
IUE spectra of CQ Cep covering virtually all binary phases are analyzed, together with new UBVJKL photometry and remeasurements of radial velocities from archived optical spectra. The high resolution UV interstellar line spectrum strongly supports CQ Cep's membership in the Cep OB1 association. Continuum light curves in 15 wavebands, from 0.13 to …