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  • 1
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    40 Eridani and the gravitational lens effect (1986)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Observations covering a period of 20 years show that the large proper motion (4.08 arcsec/yr) of the nearly triple system 40 Eridani-ABC will cause its brightest member, A, to pass within 3 arcsec of a faint background star. The originally hoped-for primary gravitational lens effect will therefore not take place although a minor secondary effect may occur near the time of closest approach on June 1, 1987.
    Keywords: ASTRONOMY
    Type: Astronomical Society of the Pacific, Publications (ISSN 0004-6280); 98; 1199
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  • 2
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    Spectral images of HD 199178 (1988)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: High-resolution IUE spectra of the Mg II k line of HD 199178 were analyzed, applying spectral imaging techniques to derive an image of the chromospheric structure and to study the transient behavior of the chromosphere. All spectra in the IUE archives were uniformly reduced and analyzed. Results are compared with ground-based observations of the photosphere. Four ultraviolet flares on HD 199178 are observed; 3 of these occurred at roughly the same rotational phase. There is no clear phase-dependence of the SWP line fluxes, but there is for the Mg II k flux. The emission centroid of the Mg II k line varies in a quasi-sinusoidal fashion, presumably due to the rotation of a nonuniform chromosphere.
    Keywords: ASTRONOMY
    Type: ESA, A Decade of UV Astronomy with the IUE Satellite, Volume 1; p 291-293
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  • 3
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    The ultraviolet spectrum of AS 201: A planetary nebula (1988)
    In:  CASI
    Details
    Publication Date: 2013-08-29
    Description: The spatially unresolved emission line object AS 201 was observed by IUE in the low dispersion mode. It shows a UV spectrum similar to that of planetary nebulae or symbiotic stars. The optical spectrum shows characteristics of a G2 III star, but the UV indicates that a hot companion is present, as evidenced by strong C III, C IV, and moderately strong He II emissions. A fairly strong continuum is also seen throughout the IUE range. The log R (I(C III)/I(Si III)) value of 1.44 strongly argues for AS 201 being a planetary nebula and not a symbiotic star.
    Keywords: ASTRONOMY
    Type: ESA, Proceedings of the Celebratory Symposium on a Decade of UV Astronomy with the IUE Satellite, Volume 2; p 179-181
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  • 4
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    The IUE spectrum of Cn 1-2 (= PK 326-10 deg 1) - A southern counterpart to V1016 Cygni and HM Sagittae? (1988)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Low-dispersion IUE spectra confirm that the emission-line object Cn 1-2 is a symbiotic star and not a planetary nebula. The UV spectrum of Cn 1-2 strongly resembles those of V1016 Cyg and HM Sge. The object is correctly identified in the finder field of Allen's Catalogue of Symbiotic Stars (1984) but misidentified in the Catalogue of Galactic Planetary Nebulae by Perek and Kohoutek (1967).
    Keywords: ASTRONOMY
    Type: Astronomical Society of the Pacific, Publications (ISSN 0004-6280); 100; 1101-110
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  • 5
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    Status report on IUE atlas of planetary nebulae and related objects (1986)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: Calibrated IUE spectrograms from an Atlas of Planetary Nebulae are shown, and the organization of the Atlas is described.
    Keywords: ASTRONOMY
    Type: ESA Proceedings of an International Symposium on New Insights in Astrophysics. Eight Years of UV Astronomy with IUE; p 299-301
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  • 6
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    Doppler imaging of active regions on AR Lacertae (1986)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: The eclipsing RS CVn system AR Lacertae was observed with IUE in October 1981 and October 1983. The phase coverage provided by the 1983 data is adequate to determine the location and size of two plage-like regions in the atmosphere of the K star using a Doppler imaging analysis of the Mg II k lines. A third epoch data set, consisting of many spectra spaced uniformly throughout a single orbital cycle was obtained in September 1985. Rotational modulation of the SWP line fluxes and an initial look at the Mg II lines reveals clear evidence of discrete chromospheric structures. These include a localized flare on the G star, a chromospherically inactive hemisphere on the G star, and plages on the K star.
    Keywords: ASTRONOMY
    Type: ESA Proceedings of an International Symposium on New Insights in Astrophysics. Eight Years of UV Astronomy with IUE; p 153-154
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  • 7
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    Doppler imaging of AR Lacertae at three epochs (1988)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Observations from IUE were used to study the structure of the lower chromosphere of AR Lacertae in the light of Mg II k. Sequences of LWR/P-HI images distributed around the binary period at three epochs were obtained. Discrete plage-like regions of enhanced Mg II surface flux in this system are identified. There are temporal variations in the Mg II flux on timescales of hours as well as substantial changes in chromospheric morphology on timescales of years. Even with the limited S/N attainable with the IUE, one can map the gross structures of active stellar atmospheres. With such information, one can begin to study the true 3-D structure of the atmospheres of late-type stars.
    Keywords: ASTRONOMY
    Type: ESA, A Decade of UV Astronomy with the IUE Satellite, Volume 1; p 295-297
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  • 8
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    Transition region fluxes in A-F Dwarfs: Basal fluxes and dynamo activity (1988)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The transition region spectra of 87 late A and early F dwarfs and subgiants were analyzed. The emission line fluxes are uniformly strong in the early F stars, and drop off rapidly among the late A stars. The basal flux level in the F stars is consistent with an extrapolation of that observed among the G stars, while the magnetic component displays the same flux-flux relations seen among solar-like stars. Despite the steep decrease in transition region emission flux for B-V less than 0.28, C II emission is detected in alpha Aql (B-V = 0.22). The dropoff in emission is inconsistent with models of the mechanically generated acoustic flux available. It is concluded that, although the nonmagnetic basal heating is an increasingly important source of atmospheric heating among the early F stars, magnetic heating occurs in any star which has a sufficiently thick convective zone to generate acoustic heating.
    Keywords: ASTRONOMY
    Type: ESA, A Decade of UV Astronomy with the IUE Satellite, Volume 1; p 323-326
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  • 9
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    Multi-wavelength observations of the peculiar red giant HR 3126 (1988)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Ultraviolet observations of the red giant HR 3126 are combined with multi-wavelength data in order to provide a firmer basis for explaining the arc-minute sized nebula surrounding the object. Possibilities as to the location of HR 3126 on the Hertzsprung-Russel diagram, and to the formation mechanisms of the reflection nebula IC 2220 associated with it, are summarized.
    Keywords: ASTRONOMY
    Type: ESA, A Decade of UV Astronomy with the IUE Satellite, Volume 1; p 253-256
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  • 10
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    IRAS observations of a large sample of normal irregular galaxies (1989)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: IRAS 12, 25, 60, and 100 micron data are presented for a sample of Irr galaxies which span a large range in star-formation activity. It is found that the dwarf, giant, and amorphous Irr's generally have similar IR properties. The typical L(IR)/L(H-alpha) ratios of most classes of Irr's, except for many of the luminous blue galaxies, are low compared with those of spiral galaxies and are consistent with the Irr's being relatively transparent systems without large amounts of optically hidden star formation. Compared with spiral galaxies, the Irr's have similar L(IR)/L(B) ratios, warmer S(100)/S(60) ratios, cooler S(25)/S(12) ratios, and lower dust-to-H I gas mass ratios. The temperature, dust-to-H I gas mass ratios, and L(IR)/L(B) ratios do not correlate with the metallicity of the ionized gas of the Irr's. A correlation between the IR fluxes and both the H-alpha and the blue stellar fluxes is found for the Irr's.
    Keywords: ASTRONOMY
    Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 336; 152-172
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