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  • Other Sources  (33)
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  • 1
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    Cataclysmic variables: Disk characteristics from UV observations (1982)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: Low dispersion IUE spectra of 3 cataclysmic variables (V442 Oph, V794 Aq1 and H2215-086) are discussed in terms of current disk models. The range of continuum fluxes, line emission and disk parameters of these three novalike systems are compared with past observations of dwarf novae at outburst and quiescence. Evidence of variability on orbital time scales is presented for V442 Oph and H2215-086.
    Keywords: ASTRONOMY
    Type: NASA. Goddard Space Flight Center Advan. in Ultraviolet Astron.; p 474-477
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  • 2
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    An infrared study of the eclipsing dwarf nova U Geminorum (1983)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: One series of data comprising the present J, H, K broadband IR photometry of the cataclysmic binary system U Geminorum over the course of two orbital cycles was obtained several days before an outburst, while a second was gathered when the system had almost completely returned to quiescence from that outburst. In quiescence, the M4-M5.5 red dwarf star supplies most of the IR luminosity of the system, while the light curves at this time are tidally induced ellipsoidal variations of the red dwarf which exhibit an amplitude such that the red dwarf must fill, or nearly fill, its Roche lobe. This shows directly that Roche lobe overflow is important in cataclysmic variable stars. The range of the disk IR colors after outbursts suggest that cool and optically thick gas, together with optically thin gas, supply most of the IR light of the disk.
    Keywords: ASTRONOMY
    Type: Royal Astronomical Society, Monthly Notices (ISSN 0035-8711); 204; Sept
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  • 3
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    IUE observations of cataclysmic variables (1982)
    In:  Other Sources
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    Publication Date: 2011-08-18
    Description: The four years of IUE operation have revealed that the ultraviolet region of the spectrum contributes a dominant share of the emerging energy from cataclysmic variables and provides important clues to the physical nature of these systems. The implications of the continuum flux distributions and line spectra for the determination of the accretion rates and mass loss rats are considered.
    Keywords: ASTROPHYSICS
    Type: (ISSN 0273-1177)
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  • 4
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    Multifrequency observations of dwarf novae outbursts (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Studies using EXOSAT and IUE data combined with ground-based optical and IR photometry, spectroscopy and polarimetry of the transition timescales and physical properties of the high accretion rate states of the disks in cataclysmic variables are discussed. Implications for dwarf novae stem from comparison of the timing and amplitude of the optical and IR rise with that of the UV and X-ray; the development of the optical and UV line profile changes as the outburst develops; and the similarity of the outburst flux distributions in different systems and different types of outbursts (standstills and supermaxima). These features of dwarf novae outbursts present interesting comparisons with the outbursts of systems like TV Col and GK Per.
    Keywords: ASTRONOMY
    Type: ESA Recent Results on Cataclysmic Variables; p 39-45
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  • 5
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    IUE observations of eight dwarf novae - A study of the outburst cycle from 0.12 to 3.5 microns (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The dwarf novae are a class of close binary systems with a G-M star transferring mass to a white dwarf. The transferred material accumulates in a disk and accretes onto the white dwarf. Dwarf novae are characterized by outbursts on time scales of weeks to months possibly triggered by instabilities in the disk. To test the steady state models and the behavior of the disk at various stages of the outburst cycle, IUE observations were conducted for eight dwarf novae. Selected UV continuum points were joined to nonsimultaneous optical and IR spectrophotometry and broad-band photography to yield flux distributions over a large wavelength range. These flux distributions are discussed in terms of available accretion disk models.
    Keywords: ASTRONOMY
    Type: Astrophysical Journal; vol. 247
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  • 6
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    Simultaneous X-ray and optical observations of an Ursae Majoris during a low state (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: In November 1975, AN UMa was detected as a soft X-ray source with a 0.1-0.4 keV flux which was modulated with the orbital cycle. In order to investigate further this orbital dependence and to correlate it with existing photometric and spectroscopic observations to aid in determining the geometry of the system, simultaneous X-ray and optical observations were made throughout several cycles of AN UMa. The system was in a low optical state during the observations. The X-ray observations were made with the Imaging Proportional Counter on the Einstein Observatory, yielding measurements over an available energy range of 0.1-4 keV. Attention is given to total X-ray flux, the X-ray light curve, optical and infrared data, and model implications.
    Keywords: ASTRONOMY
    Type: Astrophysical Journal; vol. 246
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  • 7
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    AM Herculis - Simultaneous X-ray, optical, and near-IR coverage (1980)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: A 6 hour X-ray pointing at AM Her using the HEAO 1 satellite is correlated with simultaneous broadband V and I photometry and visual circular polarimetry. The absence of correlations on either a flickering or an orbital time scale implies distinct regions for the visual and X-ray emission. Significant changes in the light curves are observed from one binary cycle to the next.
    Keywords: ASTRONOMY
    Type: Astrophysical Journal; vol. 241
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  • 8
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    A multiwavelength study of the AM Herculis type binary 2A 0311-227 (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Keywords: ASTRONOMY
    Type: Royal Astronomical Society; vol. 199
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  • 9
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    IUE and optical observations of MV Lyrae at intermediate and low states (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: 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 scanners and photometers. The photometric colors were found to be very blue at the very low state and at the normal low state. Robinson et al. (1981) have identified three components in their very low-state optical spectra. The significance of the observations is discussed.
    Keywords: ASTROPHYSICS
    Type: Astronomical Society of the Pacific; vol. 94
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  • 10
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    Lanning 10 and 33 - The X-ray, UV, and optical fluxes (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: UV spectra from IUE, optical spectroscopy, broad band photometry, and upper limits on the X-ray flux from Einstein are used to specify the characteristics of Lanning 10 and 33. Data on Lanning 33 are consistent with a 22,000 K Be star at a distance of 5 to 7 kpc, and Lanning 10 appears to include a F5-G0 star plus a hot component greater than 35,000 K at a distance of 0.9 to 1.3 kpc. The optical eclipsed fluxes are subtracted from the uneclipsed, and the observed fluxed distribution of the eclipsed light does not follow a simple power law, but is closer to a 12,000 K + or - 1000 K blackbody. Lanning 10 is placed in the category of VY Scl variables.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal; vol. 251
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