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  • 1
    Electronic Resource
    Electronic Resource
    Small rafts of xenon physisorbed on Pt(111) (1990)
    Springer
    Applied physics 51 (1990), S. 121-125 
    Details
    ISSN: 1432-0630
    Keywords: 68.35.Rh ; 82.20.Pm
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The behavior of small rafts of xenon (〈50 particles) is illustrated. Events which involve collective motion of raft atoms are shown to occur. These events are persistent below a transition temperature and are not persistent above this temperature. A video of the events is available.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00324274
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    Paper (German National Licenses)
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  • 2
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    Ultraviolet, X-ray, and infrared observations of HDE 226868 equals Cygnus X-1 (1980)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: During April, May, and July of 1978, HDE 226868, the optical counterpart of Cygnus X-1, was repeatedly observed in the ultraviolet with the IUE satellite. Some X-ray and infrared observations have been made during the same period. The general shape of the spectrum is that expected from a late O supergiant. Strong absorption features are apparent in the ultraviolet, some of which have been identified. The equivalent widths of the most prominent lines appear to be modulated with the orbital phase. This modulation is discussed in terms of the ionization contours calculated by Hatchett and McCray, for a binary X-ray source in the stellar wind of the companion.
    Keywords: ASTRONOMY
    Type: Astrophysical Journal; vol. 242
    Format: text
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  • 3
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    The perplexing spectrum of AFGL 2789 /V645 CYGNI/ (1980)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: Visual spectra and photometry from 0.35 to 18 microns show that AFGL 2789 may be one of the most interesting of the infrared sources now identified with reflection nebulae. It has an Ae-type shell spectrum with strong emission lines of hydrogen, Fe II, Cr II, and Ti II, but the most remarkable feature is a broad absorption band near 5500 A, presumably molecular, with three possible band heads. This absorption band was present on only one of two spectra taken one night apart. The two known molecules with wavelengths closest to the observed band heads are C2 and H2O(+), although there are problems with either of these as possible identifications.
    Keywords: ASTRONOMY
    Type: Astrophysical Journal; vol. 237
    Format: text
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  • 4
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    Ultraviolet emission of the Vela supernova remnant and the Cygnus Loop (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Ultraviolet emission spectra of several filaments in the Vela supernova remnant and the Cygnus Loop are compared with theoretical models of radiative shocks. Shock velocities range from 85 to 130 km/s. Little or no grain depletion is apparent. Several of the observed filaments deviate from the steady-flow models in the sense that much of the photoionization-recombination zone is absent. It is shown that resonance line scattering within the emitting region can account for the weakness of the C II 1335 and C IV 1550 lines. Evaporation fronts, which are basic to the McKee and Ostriker picture of supernova remnant evolution, do not contribute significantly to the observed emission. Some discrepancies in UV emission predicted by different sets of shock models are traced to differing atomic rates used in the calculations. A fluorescent emission line of H2 may be observable in some supernova remnants.
    Keywords: ASTRONOMY
    Type: Astrophysical Journal; vol. 246
    Format: text
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  • 5
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    Ultraviolet spectroscopic observations of VV Cephei (1980)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Observations with the International Ultraviolet Explorer satellite (IUE) of the recent egress of the eclipsing binary VV Cep(M2Iabep + B) are presented. Egress in the ultraviolet lagged behind the visible egress by 2 to 3 months, as a result of higher opacity of the M star atmosphere in the ultraviolet. Shortly after visible egress, the low-dispersion spectrum from 1200-1900 wavelengths was dominated by fluorescent emission lines arising in the atmosphere of the M star and excited by the ultraviolet continuum of the hot companion. High-dispersion spectra show a hot continuum blanketed by absorption lines, some of which weaken or disappear as the egress continues. A year after eclipse, the absorption spectrum is still too complex to permit determination of a spectral type for the hot companion. The Mg II h and k lines both exhibit asymmetric double-peaked emission features indicative of an expanding chromosphere in the M supergiant.
    Keywords: ASTRONOMY
    Type: Astrophysical Journal; vol. 238
    Format: text
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  • 6
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    High-resolution spectroscopy of the optical candidate for the X-ray transient X0331 + 53 (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: High-resolution spectral observations of the optical candidate for the X-ray transient X0331 + 53 are presented. The data show broad hydrogen and helium emission and strong interstellar absorption corresponding to a visual extinction of about 7 mag. No photospheric absorption in the emission lines, and no radial-velocity variations greater than 0.5 km/s were found over a three-day period. It is concluded that the optical continuum does not arise at or near the primary star. As an example of the spectrographic data, a resolution profile of H-alpha emission in X0331 + 53 is provided.
    Keywords: ASTRONOMY
    Type: Astronomical Society of the Pacific, Publications (ISSN 0004-6280); 97; 126-129
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  • 7
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    Vibrationally excited H2, HCl, and NO(+) in the diffuse clouds toward Zeta Ophiuchi (1995)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Absorption lines from vibrationally excited H2 and from HCl were detected in the ultraviolet spectrum of Zeta Oph with the Hubble Space Telescope (HST). Improved upper limits on NO(+) absorption were obtained as well. The data were analyzed with an updated version of a chemical model for diffuse clouds (van Dishoeck & Black 1986) as a guide to understanding this gaseous environment. The comparisons suggest that the flux of ultraviolet radiation impinging on the cloud surface is approximately 1-2 times the average interstellar radiation field, which is lower than once believed.
    Keywords: ASTRONOMY
    Type: The Astrophysical Journal, Part 1 (ISSN 0004-637X); 445; 1; p. 325-329
    Format: text
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