Search Publications
Discovery of a nitrogen-rich uv-bright star in the globular cluster M5.
Bohlin, R. C.; Stecher, T. P.; Cornett, R. H. +3 more
Ultraviolet images of the globular cluster M5 (NGC 5904) obtained with a rocket-borne telescope show a hot and luminous star ≡20arcsec from the cluster center. Spectra of this UV-bright star, obtained with the IUE satellite in the low-resolution mode, reveal an energy distribution very similar to that of µ Col, a Population I O9.5 IV star. A…
Observations of ultraviolet carbon lines in the spectra of three DC white dwarfs.
Wegner, G.
Ultraviolet spectra of three DC white dwarfs have been obtained using the International Ultraviolet Explorer satellite (IUE). These objects are LDS 275A (= EG 66 = 0935-37), G187-15 (=LTT16151 = EG262 = 2059+31), and L791-40 (=LTT9491 = EG264 = 2317-17). All three show the strong ultraviolet lines of neutral carbon recently found in the spectra of…
The narrow ultraviolet emission lines of the red dwarf AU Microscopii(dM1.6e).
Eriksson, K.; Stencel, R. E.; Linsky, J. L. +1 more
It is pointed out that the red dwarfs are the smallest, coolest, faintest, least massive, but most common of normal main-sequence stars. The dMe (H-alpha emission) subclass of the red dwarfs exhibits the largest median soft X-ray to bolometric luminosity ratio of any group of late-type stars. In connection with the present investigation, attention…
The cool DC white dwarf Stein 2051B.
Wegner, G.; Yackovich, F. H.
Visual scans from the Kitt-Peak 2.1-m telescope and UV spectra from the IUE satellite are combined in a spectroscopic study of the bright DC white dwarf, Stein 2051B. With a cooling age near 2 billion years, and a resulting atmospheric mass of hydrogen of the order of 6 x 10 to the 17th g, the accretion rate over the star's lifetime is less than 2…
The extreme LMC supergiant HD 38489 : an optical and ultraviolet study.
Shore, S. N.; Sanduleak, N.
This investigation combines near-infrared, optical, and ultraviolet observations covering λλ1200 - 7000 to study the extremely luminous B star HD 38489 = S134. The star is found to be an evolved B star with Teff ≈ 25,000K, M ≡ 80 - 90 M_sun;, and R ≡ 70 R_sun;. The star is similar to the spectra of some of the superluminous stars of the…
Rapid rotation and stellar activity in the triple system HD 165590.
Stern, R. A.; Skumanich, A.
X-ray and ultraviolet observations of the spectroscopic and visual binary HD 165590 are presented. Results show that the spectroscopic binary component has a period of 0.88 day and a near-solar spectral type. A substantial soft X-ray flux for HD 165590 is also found with an X-ray luminosity of 10 to the 30.6th ergs/sec for the system. No obvious p…
The hot do white dwarf HD 149499B : Einstein redshift of a DB progenitor with carbon features.
Sion, E. M.; Guinan, E. F.
High-resolution IUE spectra of the hot DO white dwarf HD 149499B have been analyzed. The mass of the white dwarf needed to fit the measured gravitational redshift is 0.4-0.6 solar mass for a degenerate core composed of carbon based upon using a nonzero temperature mass-radius relation. The resonance doublet of C IV (1550 A) appears to be photosphe…
IUE observations of the perplexing bipolar planetary nebula NGC 2346.
Feibelman, W. A.; Aller, L. H.
A preliminary analysis of International Ultraviolet Explorer (IUE) low-dispersion spectrograms of NGC 2346, obtained at various phases of the eclipsing nucleus, shows features typical of a high-excitation planetary nebula. Variations in line profiles, intensities, and stellar continuum are observed as a function of time. An orbital period of 16.0 …
The 1982 ultraviolet eclipse of the symbiotic binary AR Pav.
Ake, T. B.; Hutchings, J. B.; Cowley, A. P. +1 more
Observations with the International Ultraviolet Explorer (IUE) of the symbiotic binary AR Pav through its 1982 eclipse show that the hot star is not eclipsed. The hot star is associated with an extended region of continuum emission which is partially eclipsed. The eclipsed radiation is hotter near to its center, with a maximum temperature of about…
The partial phase of the eclipse of Epsilon Aurigae.
Kondo, Y.; Stencel, R. E.; Chapman, R. D.
Ultraviolet spectra of the peculiar eclipsing binary Epsilon Aurigae (FO Ia + ?) were obtained with the International Ultraviolet Explorer at pre-eclipse and ingress partial phases. The results show a wavelength dependence of the eclipse in contrast to the grayness (non-wavelength dependence) of the eclipse observed in visible light. From the curr…