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  • 1
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    Partially Crystalline Silicate Dust in Protostellar Disks (1996)
    In:  CASI
    Details
    Publication Date: 2004-12-03
    Description: We examine the infrared emission of the Herbig Ae/Be stars and show that some possess characteristics indicative of partially crystalline grains similar to those seen in Beta Pictoris and some solar system comets.
    Keywords: Astronomy
    Type: From Stardust to Planetesimals: Contributed Papers; 19-22; NASA-CP-3343
    Format: text
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  • 2
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    Mid-Infrared Spectra of Comets P/Borrelly, P/Faye, and P/Schaumasse (1996)
    In:  Other Sources
    Details
    Publication Date: 2011-08-23
    Description: A 10 micron silicate emission feature has been discovered in the spectra of comets P/BorrelIy and P/Faye at R approximately 1.5 AU. These are the first short period comets in which silicate emission has definitely been detected. The broad emission features are about 25% above the continuum. No emission feature was present in the spectrum of P/Schaumasse; it is possible that the nucleus of P/Schaumasse was directly detected. If all of the observed flux originated from the nucleus, then the effective radius is about 3 km; the observed color temperature is consistent with a rapidly rotating nucleus. We present models that show how the shape of the silicate feature can depend on the way in which silicate and absorbing material are mixed in the grains.
    Keywords: Astronomy
    Type: ICARUS (ISSN 0019-1035); Volume 124; Article No. 0209; 344-351
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  • 3
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    Spectral Irradiance Calibration in the Infrared (1995)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: We present five new absolutely calibrated continuous stellar spectra from 1.2 to 35 microns, constructed as far as possible from actual observed spectral fragments taken from the ground, the Kuiper Airborne Observatory (KAO), and the IRAS Low Resolution Spectrometer (LRS). These stars, Beta Peg, Delta Boo, Beta And, Beta Gem, and Delta Hya, augment our already created complete absolutely calibrated spectrum for a Tau. All these spectra have a common calibration pedigree. The wavelength coverage is ideal for calibration of many existing and proposed ground-based, airborne, and satellite sensors.
    Keywords: Astronomy
    Type: Astronomical Journal (ISSN 0004-6256); 110; 1; 275-289
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  • 4
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    Mission Planning for the CHANDRA X-Ray Observatory (1999)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The CHANDRA x-ray observatory started life as the Advanced X-ray Facility (AXAF) but was renamed Chandra in December of 1998 at the of a nationwide contest by NASA to name the new observatory. The honors the Nobel Prize winning astrophysicist S. Chandrasekar who astrophysics at the University of Chicago for more than 50 years, following graduate studies at Cambridge University in England. The observatory has been under construction for a decade under the management of the Observatory observatory, Projects office at the Marshall Space Flight Center; the same office that oversaw the construction of the Hubble Space Telescope and the Compton Gamma Ray Observatory. This observatory is a member of NASA's great observatory series of missions of which Hubble and Compton are members. This paper describes the mission planning that was conducted at MSFC to design the orbit and launch window that would permit the new observatory to function properly.
    Keywords: Astronomy
    Type: Astrodynamics Specialists Conference; Aug 16, 1999 - Aug 19, 1999; Girdwood, AK; United States
    Format: application/pdf
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  • 5
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    Polycapillary X-Ray Optics for X-Ray Astronomy (1999)
    In:  Other Sources
    Details
    Publication Date: 2019-07-17
    Description: High-energy x-ray spectrometry from astronomical sources is difficult due to low flux rates and high background. Polycapillary x-ray optics can be used to increase the signal-to-noise ratio by focusing photons onto a small energy dispersive detector. Two optics, both designed for x-ray astronomy, have been built and tested as collimating optics with a microfocus x-ray source for x-ray energies up to 70 keV and as focusing optics with parallel x-rays up to 50 keV. Results from these tests show that polycapillary x-ray optics have transmission efficiencies ranging from 5% to 40% and signal gains ranging from 5 to over 100 for energies up to 50 keV. Furthermore the results show that these optics have potential for use up to 100 keV. The experimental results as well as simulations for the measured and for optimized optics will be discussed.
    Keywords: Astronomy
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  • 6
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    Spectral Irradiance Calibration in the Infrared (1995)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Five new absolutely calibrated continuous stellar spectra from 1.2 to 35 microns are presented. The spectra were constructed as far as possible from actual observed spectral fragments taken from the ground, the Kuiper Airborne Observatory (KAO), and the IRAS Low Resolution Spectrometer (LRS). These stars (beta Peg, alpha Boo, beta And, beta Gem, and alpha Hya) augment the author's already created complete absolutely calibrated spectrum for alpha Tau. All these spectra have a common calibration pedigree. The wavelength coverage is ideal for calibration of many existing and proposed ground-based, airborne, and satellite sensors.
    Keywords: Astronomy
    Type: NASA-CR-202612 , NAS 1.26:202612 , The Astronomical Journal (ISSN 0004-6256); 110; 1; 275-289
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  • 7
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    The Intermittently Embedded Herbig AE/BE Stars (1998)
    In:  Other Sources
    Details
    Publication Date: 2019-08-15
    Description: We discuss silicate emission profiles observed with the ISO SWS and ground-based IR observations in a population of intermittently embedded Herbig Ae/Be stars which are viewed edge-on to their polarimetrically identified dust and gas disks. The ISO SWS observations confirm the lack of a simple correlation between system age and the profile shape. Comparison with laboratory silicates suggests that much of the observed variation is due to different annealing histories of the grains.
    Keywords: Astronomy
    Type: Astrophysics and Space Science; 255; 35-41
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  • 8
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    Constellation-X Spectroscopy X-Ray Telescope Requirements and Development Program: MSFC Research Program (1999)
    In:  Other Sources
    Details
    Publication Date: 2019-07-17
    Description: The Constellation-X Spectroscopy X-ray Telescope (SXT) will provide high-throughput, high-resolution spectroscopy of cosmic sources, from 0.25 keV to 10 keV. Key to this capability is the development of large (1.6 m diameter), lightweight optics for the SXT mirror assembly. Teams led by NASA's Marshall Space Flight Center (MSFC), by NASA's Goddard Space Flight Center (GSFC), and by Italy's Osservatorio Astronomico di Brera (OAB) are currently developing competing mirror technologies for this planned mission. Each team is making significant research progress in developing mirror technologies which satisfy the SXT requirements for lightweight optics, consistent with a system-level optical performance of better than 15 arcsec half-power diameter. The NASA Marshall Space Flight Center (MSFC), in collaboration with the Smithsonian Astrophysical Observatory (SAO), has focussed its efforts on full-shell replicated optics, of electroformed nickel alloys. Recent progress in identifying a surface treatment to effect low, controlled adhesion and, more significantly, in developing new high-strength nickel alloys make this a viable, low cost approach to satisfying the SXT requirements.
    Keywords: Astronomy
    Type: Jul 18, 1999 - Jul 23, 1999; Denver, CO; United States
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