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  • ASTROPHYSICS  (11)
  • Lunar and Planetary Science and Exploration  (5)
  • Area; CoralFISH; Ecosystem based management of corals, fish and fisheries in the deep waters of Europe and beyond; ELEVATION; Filter; Height; Identification; LATITUDE; LONGITUDE  (2)
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  • 1
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    List of seamounts in the world ocean (2011)
    PANGAEA
    Details
    Publication Date: 2024-02-17
    Keywords: Area; CoralFISH; Ecosystem based management of corals, fish and fisheries in the deep waters of Europe and beyond; ELEVATION; Filter; Height; Identification; LATITUDE; LONGITUDE
    Type: Dataset
    Format: text/tab-separated-values, 133808 data points
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    DATA PANGAEA
  • 2
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    List of knolls in the world ocean (2011)
    PANGAEA
    Details
    Publication Date: 2024-02-17
    Keywords: Area; CoralFISH; Ecosystem based management of corals, fish and fisheries in the deep waters of Europe and beyond; ELEVATION; Filter; Height; Identification; LATITUDE; LONGITUDE
    Type: Dataset
    Format: text/tab-separated-values, 553648 data points
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    DATA PANGAEA
  • 3
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    Elemental Fractionation in Ultraviolet Laser Ablation of Igneous Silicate Minerals Relevant to Mars (1999)
    In:  Other Sources
    Details
    Publication Date: 2018-06-08
    Description: Laser ablation has significant potential for terrestrial and extraterrestrial remote sampling applications if elemental fractionation can be understood and controlled.
    Keywords: Lunar and Planetary Science and Exploration
    Type: Geochimica et Cosmochimica Acta
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Elemental Fractionation In Ultraviolet Laser Ablation of Igneous Silicate Minerals Relevant to Mars (2000)
    In:  Other Sources
    Details
    Publication Date: 2018-06-08
    Description: Laser ablation has significant potential for terrestrial and extraterrestrial remote sampling applications if elemental fractionation can be understood and controlled.
    Keywords: Lunar and Planetary Science and Exploration
    Type: Applied Surface Science
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    A Combined Laser Ablation-Resonance Ionization Mass Spectrometer for Planetary Surface Geochronology (2002)
    In:  Other Sources
    Details
    Publication Date: 2019-07-18
    Description: Progress in the development of an instrument for direct geochronologic measurements on rocks in situ will be described. The instrument integrates laser ablation sampling, resonance ionization, and mass spectrometry to directly measure concentrations of the Rb-Sr isotope system. Additional information is contained in the original extended abstract.
    Keywords: Lunar and Planetary Science and Exploration
    Type: Lunar and Planetary Science XXXIII; LPI-Contrib-1109
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    The gravitational lens system Q0957+561 in the ultraviolet (1995)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Photometric and polarimetric observations of both images of the gravitationally lensed quasar Q0957+561 (z(sub em) = 1.41) were obtained in the UV in 1993 with the High Speed Photometer on board the Hubble Space Photometer on board the Hubble Space Telescope. The images exhibited no significant polarization in a bandpass centered on 2770 A (observer's frame); p less than or = 3.2 % (2 sigma upper limit) in each image. The ratio of the flux density in image A to that in image B in late 1993 had a constant valuee, 1.021 +/- 0.008, in four different UV bandpass between 1400 A and 3040 A observer's frame). These results are consistent with the prediction of the gravitation lens interpretation that the photometric ratio of the images measured simultaneously should be independent of frequency. Reprocessed archival spectra of the two images obtained between 1981 and 1983 by the International Ultraviolet Explorer (IUE) show that the photometric ratio of A to B varies between 0.96 and 2.0 in the Ly alpha emission line, and between 0.77 and 1.8 in the O VI lambda 1037 emission line (quasar rest frame). The photometric ratio of A to B at any single epoch is often significantly different in the two emission lines. Accepting the system as a gravitational lens implies that in the quasar the flux in the Ly alpha emsisson line can vary independently of the flux in the 0 IV emission line.
    Keywords: ASTROPHYSICS
    Type: The Astrophysical Journal, Part 1 (ISSN 0004-637X); 442; 1; p. 87-90
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    The linear polarization of 3C 345 in the ultraviolet (1994)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The linear polarization of 3C 345, a superluminal radio source and OVV quasar, was observed in two bandpasses in the ultraviolet (centered at 2160 A and 2770 A) in 1993 April using the High Speed Photometer on the Hubble Space Telescope. The quasar is significantly polarized in the UV (p greater than 5%). Ground-based polarimetry was obtained 11 days later, but a difference in the position angle between the observations in the visible and those in the UV indicate that the magnitude of the polarization of 3C 345 may have changed over that time. If the two observation sets represent the same state of spectral polarization, then the large UV flux implies that either the polarization of the synchrotron continuum must stop decreasing in the UV, or that there is an additional source of polarized flux in the ultraviolet. Only if the UV observations represent a spectral polarization state with the same position angle in the visible seen previously in 3C 345 can the polarized flux be represented by a single power law consistent with the three-component model of Smith et al. This model consists of a polarized synchrotron component, an unpolarized component from the broad-line region, and an unpolarized component attributed to thermal radiation from an optically thick accretion disk. Additional simultaneous polarimetry in the UV and visible will be required to further constrain models of the continuum emission processes in 3C 345 and determine if the UV polarized flux is synchrotron in origin.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 432; 2; p. 560-566
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  • 8
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    On the wind geometry of the Wolf-Rayet star EZ Canis Majoris (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Recent models of Wolf-Rayet star winds have been tailored to EZ CMa, and make predictions of the envelope structure and location of line-emitting regions. It is discussed how the wind structure of EZ CMa can be probed observationally through electron distribution integrals as measured by spectropolarimetry, and then present, analyze, and interpret a time-dependent spectropolarimetric data set of EZ CMa. The observations further the view of an electron-scattering wind that is axisymmetric, rotating, and expanding, with a variable mass-loss rate being responsible for the quasi-periodic polarimetric variability. It is demonstrated that the emission lines of EZ CMa are partially polarized, indicating that line photons are electron-scattered in the wind. The polarization in N V lambda 4945 and N IV lambda 4058 is observed to be larger than that of He II lambda 4686 and He I lambda 5876, as expected from ionization stratification.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 382; 301-314
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  • 9
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    The wind geometry of the Wolf-Rayet star HD 191765 (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: A time-dependent spectropolarimetric data set of HD 191765 in the wavelength range 3159-7593 A is presented. At all epochs the present observations display a large and strongly wavelength-dependent continuum polarization and reduced levels of polarization across the emission lines. The data imply a significant intrinsic continuum polarization which requires a general deviation of the electron distribution from spherical symmetry. The global shape is quite stable as a function of time; small fluctuations may arise from localized density/temperature changes. The line polarizations are consistent with an axisymmetric wind geometry and ionization stratification. A qualitative model for polarization in a Wolf-Rayet atmosphere is developed. It is argued that the blueward rise of the continuum polarization in HD 191765 can be explained if the density in the wind is high, resulting in a competition of thermal and electron-scattering continuum opacity in the vertical.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 387; 347-356
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    NASA TECHNICAL REPORTS
  • 10
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    First ultraviolet spectropolarimetry of hot supergiants (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: UV spectropolarimetric observations of the early-type supergiant stars P Cygni and Kappa Cassiopeiae obtained with the Wisconsin UV Photo-Polarimeter Experiment (WUPPE) are presented. Contrary to model predictions, the intrinsic polarization of P Cyg remains constant in the Balmer continuum except for a broad dip between 2600 and 3000 A. This decrease in polarization is discussed in terms of possible Fe line blanketing effects. The intrinsic position angle is essentially constant in the UV except for a rotation across the feature between 2600 and 3000 A. The intrinsic polarization of Kappa Cas is small; most of the observed polarization is interstellar in nature. The Serkowski curve extrapolated into the UV is found to fall consistently below the observed polarization. A slight rotation in position angle from optical to UV wavelengths is noted. Very good agreement is found between the mean continuum polarization obtained by WUPPE and the broadband UV polarization measurement obtained by Gehrels (1968).
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X); 382; L85-L88
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