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The OB subdwarf Feige 66, a chemical-composition twin to HD 149382.
Hoeflich, P.; Scholz, M.; Baschek, B.
The ultraviolet (1160 to 3230 A) and the blue spectrum of the OB subdwarf, Feige 66, is analyzed differentially to HD 149382. The effective temperature, the surface gravity and the helium abundance of Feige 66 deviate only very little from those of HD 149382. The line spectra are almost identical, and the same strange abundance pattern as in HD 14…
Ultraviolet observations of four symbiotic stars.
Feibelman, W. A.; Kafatos, M.; Michalitsianos, A. G. +1 more
Observations were obtained with the International Ultraviolet Explorer (IUE) of four symbiotic stars. The UV spectra of YY Her, SY Mus, CL Sco, and BX Mon are characterized by varying degrees of thermal excitation. These low resolution spectra have been analyzed in terms of line-blanketed model atmospheres of early A, B, and F type stars in order …
Ultraviolet spectroscopy of the nova-like variable V3885 Sgr.
Sion, E. M.; Guinan, E. F.
Low-dispersion long and short wavelength IUE spectra of the nova-like system V3885 Sgr were obtained on 1979 August 24 UT. The UV spectrum exhibits strong, high-temperature absorption lines of C III, C IV, He II, N IV, N V, and Si IV which all have relatively large negative velocities of 600-1000 km/s at their line centers. The C IV (1550 A) featu…
The peculiar extinction of Herschel 36.
Wolf, J.; Donn, B.; Pipher, J. L. +2 more
The extinction of Herschel 36 has been measured and been found to be peculiar in the same sense as that observed in Orion. Following the treatment of Mathis and Wallenhorst (1981), this can be explained by the presence of silicate and graphite grains that are larger than those normally found in the interstellar medium. Correcting the stellar flux …
IUE observations of the peculiar star RX Pup.
Feibelman, W. A.; Kafatos, M.; Michalitsianos, A. G.
The first set of high-dispersion UV observations of RX Pup are presented. Anomalous line profile structure observed in a number of high-excitation emission lines is discussed in context with a model that includes streams and complex mass motions in the system. Anomalies in high-excitation lines suggest dynamic activity in circumstellar material th…
IUE and optical observations of MV LYR at intermediate and low states.
Szkody, P.; Downes, R. A.
Ultraviolet observations of MV Lyrae were obtained with the aid of the International Ultraviolet Explorer (IUE) spacecraft on 1979 December 2 when MV Lyr was at a normal low state and on 1980 December 8. The optical observations were obtained at Kitt Peak, Lick Observatory, and the University of Washington Observatory with various image-tube scann…
Ultraviolet spectrophotometry of 2A 1822-37.1 : a bulge on the accretion disk.
Mason, K. O.; Cordova, F. A.
It is suggested that the 5.57-hour modulation of the X-ray source 2A 1822-371 is caused by the combined effects of (1) an occultation of the emitting region by a companion star, and (2) a bulge on the accretion disk surrounding the X-ray source. It is speculated that the changing aspect of the X-ray-heated inner face of the bulge with orbital phas…
Ultraviolet spectroscopy of planetary nebulae in the Magellanci Clouds.
Gull, T. R.; Stecher, T. P.; Maran, S. P. +1 more
Ultraviolet spectra of the high excitation planetary nebulas LMC P40, SMC N2, and SMC N5 are presented in an investigation of their chemical composition in an effort to make reliable estimates of the carbon abundance in extragalactic planetary nebulas. The carbon abundance is found to be almost 40 times more abundant in the SMC planetaries than in…
Ultraviolet comparison of normal outbursts and a supermaximum in two dwarf novae.
Szkody, P.
IUE spectra of AY Lyr obtained shortly after supermaximum and normal maximum and of RX And after normal maximum are compared. All spectra are compatible with steady state disk models in the ultraviolet while the declining stages show an upturn in flux longward of 2500 A which indicates the presence of a cool component. For the same optical magnitu…
Bismuth abundance anomaly in a Hg-Mn star
Jacobs, J. M.; Dworetsky, M. M.
Strong absorption lines due to Bi II have been found in the Hg-Mn star HR7775 (HD193452) in high-resolution spectra obtained with the IUE. HR7775 was first recognized as a chemically peculiar star by Preston in 1972. Detailed examination of the optical spectrum at high resolution1 showed that it is one of the most extreme stars of the `…