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  • 1
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Palo Alto, Calif. : Annual Reviews
    ISSN: 0066-4146
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Physics
    Type of Medium: Electronic Resource
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  • 4
    Publication Date: 2011-08-17
    Description: Scans of interstellar ultraviolet absorption lines of N I, N II, and Si III for 17 stars are combined with previously published data for 30 stars. The extremal velocities at which detectable absorption occurs are tabulated, and it is shown that these are correlated for the three species. The data suggest that intermediate-velocity gas (20 to 60 km/s), best known from Na I and Ca II absorption, contains both neutral and ionized hydrogen. Features characteristic of intermediate-velocity isothermal shocks (greater than 60 km/s) are conspicuously rare. The intermediate-velocity gas may be in the form of clouds containing both H I and H II regions or of radiative shocks propagating in the interstellar medium; in the latter case the gas should be detectable in H-alpha emission.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal; vol. 220
    Format: text
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  • 5
    Publication Date: 2011-08-17
    Description: Several absorption components detected in visible or UV lines have been identified with emission features in new high-resolution, high signal-to-noise 21 cm observations. Stars for which direct overlap is obtained are HD 28497, lambda Ori, mu Col, HD 50896, rho Leo, HD 93521, and HD 219881. With the use of the inferred H I column densities from 21 cm profiles, rather than the integrated column densities obtained from L-alpha, more reliable densities can be derived from the existence of molecular hydrogen. Hence the cloud thicknesses are better determined; and 21 cm emission maps near these stars can be used to obtain dimensions on the plane of the sky. It is now feasible to derive detailed geometries for isolated clumps of gas which produce visual absorption features.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal; vol. 219
    Format: text
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  • 6
    Publication Date: 2011-08-17
    Description: Based on line-of-sight models and profile fitting, abundance variations of Ca, Si, Fe, and Na in high-velocity interstellar clouds toward Mu Columbae, HD 28497, and HD 50896 are discussed. The correlation of larger ratios N(Ca II)/N(Na I) with increasing radial velocity in clouds with absolute values of radial velocity from 20 to 100 km/s, is shown to quite likely be due to abundance variations in Ca rather than an ionization effect. Copernicus UV data show that the ratios N(Fe II)/N(S II) and N(Si II)/N(S II) have the same velocity correlation as Ca II, and the ambiguity concerning the relative abundance of Na I to hydrogen is removed. Theories of grain disruption are discussed as they relate to the observed Ca, Si, and Fe enhancements and their correlation with cloud velocity.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal; vol. 211
    Format: text
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  • 7
    Publication Date: 2011-08-17
    Description: Results are reported for Copernicus observations of the double-lined binary V Puppis in the wavelength region from 1155 to 1310 A with a resolution of 0.2 A. The sharp-lined UV absorption spectrum is found to provide a line of sight dominated by an apparently 'textbook' H II region in a Stromgren sphere surrounding the stars. Several characteristics of this H II region are deduced by analyzing absorption features arising from excited fine-structure states of N II and Si II. Evidence is given for the presence of a normal interstellar H I region containing H2 and a separate H I region which could be the transition zone of the H II region. A possible blueshifted N V feature is noted in absorption. It is suggested that the H(+) emission measure and a characteristic size and shape for the H II region can probably be determined by optical observations of Balmer recombination lines within about 1 deg of V Puppis.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal; 210; Nov. 15
    Format: text
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  • 8
    Publication Date: 2011-08-16
    Description: The X-ray absorption column of 3U 0352+30 obtained with the Copernicus X-ray telescopes is compared with the atomic and molecular hydrogen column densities in the line of sight to X Per, as measured with the Copernicus ultraviolet telescopes, and with the visible reddening of X Per, by means of reddening/X-ray absorption-column relationships. The results are consistent with both the star and X-ray source being equidistant. When comparing X-ray absorbing column densities with those derived by other means, it is necessary to include the effects of molecular hydrogen in the line of sight to X Per and, in particular, the related number of medium-weight elements. It is suggested that failure to do this in previous work may account for reported discrepancies between the X-ray and radio column densities to the Crab Nebula and other sources. The far-ultraviolet extinction curve of X Per is presented.
    Keywords: ASTROPHYSICS
    Type: Royal Astronomical Society; vol. 176
    Format: text
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  • 9
    Publication Date: 2011-08-16
    Description: Several spectra of the optical object identified with the X-ray flare source A0620-00 have been obtained at 5 A/mm with the Cassegrain echelle spectrograph on the 4-m Mayall telescope at Kitt Peak National Observatory. These spectra reveal no significant stellar lines, but the flux distribution in the range 4250-7400 A, dereddened for a color excess of 0.9 mag, is similar to that of an O star. The color excess, which is derived from the observed strength of the 5780-A diffuse interstellar band, and the velocities and strengths of the interstellar Na I D lines imply that the object is between 1.5 and 2.5 kpc from the sun. If a distance of 2 kpc is adopted, then the luminosity of the source in the observed wavelength region is roughly 5 by 10 to the 35th power erg/s. The possibility that this object is a slow nova is discussed.
    Keywords: ASTRONOMY
    Type: Astrophysical Journal; 206; May 15
    Format: text
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  • 10
    Publication Date: 2011-08-16
    Description: Copernicus satellite observations of the deuterium and hydrogen Lyman lines in the lines of sight to mu COl, gamma-2 Vel, alpha Cru AB, and alpha Vir AB are reported. Together with previously published data for beta Cen A, the results yield a value N(D)/N(H) of approximately 0.000018 (m.e.) or a total deuterium mass portion of approximately 0.000025. Values for all stars with their error bars are contained within a band ranging from 0.25 to 2.0 times the quoted mean ratio. These limits are probably representative of the region within 200 pc of the sun. The results for these stars are essentially independent of assumptions about the Doppler parameter describing the formation of the lines, although this value can be derived from the observations. The results are consistent with a maximum temperature of 6000 K for the lines of sight studied.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal; 203; Jan. 15
    Format: text
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