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  • Other Sources  (2)
  • Astronomy  (2)
  • 2000-2004  (2)
  • 1955-1959
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    Chandra Observations of Magnetic White Dwarfs and Their Theoretical Implications (2002)
    In:  Other Sources
    Details
    Publication Date: 2019-07-18
    Description: Observations of cool DA and DB white dwarfs have not yet been successful in detecting coronal X-ray emission but observations of late-type dwarfs and giants show that coronae are common for these stars. To produce coronal X-rays, a star must have dynamo-generated surface magnetic fields and a well-developed convection zone. There is strong observational evidence that the DA star LHS 1038 and the DB star GD 358 have weak and variable surface magnetic fields. Since these fields are likely to be generated by dynamo action and since both stars have well-developed convection zones, theory predicts detectable levels of coronal X-rays from these white dwarfs. However, we present analysis of Chandra observations of both stars showing no detectable X-ray emission. The derived upper limits for the X-ray fluxes provide strong constraints on theories of formation of coronae around magnetic white dwarfs.
    Keywords: Astronomy
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    NASA TECHNICAL REPORTS
  • 2
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    Optical Characteristics of the Marshall Space Flight Center Solar Ultraviolet Magnetograph (2001)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: This paper will describe the scientific objectives of the Marshall Space Flight Center (MSFC) Solar Ultraviolet Magnetograph Investigation (SUMI) and the optical components that have been developed to meet those objectives. In order to test the scientific feasibility of measuring magnetic fields in the UV, a sounding rocket payload is being developed. This paper will discuss: (1) the scientific measurements that will be made by the SUMI sounding rocket program, (2) how the optics have been optimized for simultaneous measurements of two magnetic lines CIV (1550 Angstroms) and MgII (2800 Angstroms), and (3) the optical, reflectance, transmission and polarization measurements that have been made on the SUMI telescope mirror and polarimeter.
    Keywords: Astronomy
    Type: (ISSN 0277-786X)|Optical Characteristics of the Marshall Space Flight Center Solar Ultraviolet Magnetograph; Aug 01, 2001 - Aug 02, 2001; San Diego, CA; United States
    Format: text
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    NASA TECHNICAL REPORTS
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