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  • 1
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    A continued program of planetary study at the University of Texas McDonald Observatory (1986)
    In:  CASI
    Details
    Publication Date: 2006-02-14
    Description: The beginning of eclipses of the Pluto-Charon system was detected. The onset of coma formation of P/Halley at 5.4 au was detected and evidence of sublimation at 4.8 au when CN emission was detected. Extensive spatial maps of the gas in the comae of comets Halley and Giacobini-Zinner were obtained in fall 1985. Halley was time variable, and Giacobini-Zinner was depleted in C2 and C3 relative to CN. Comet Kopff was shown to have a pre-perihelion brightness maximum of its gas, consistent with mantle development if the comet is a high obliquity object. New Haser model scale lengths for CN, C3, and C2 were determined using results from the Faint Comet Survey. Spectra of 12 asteroids in unusual orbits showed no evidence of any comet-like emission features. In particular, 3200 Phaethon (1983 TB) has no gas or dust coma, in spite of the similarity of its orbit with the Geminid meteor stream. Data were analyzed on Saturn's H2 and CH4 bands for the recent southern summer using a Tomasko-Doose type of haze distribution. This haze model fits the data moderately well, giving a CH4 mixing ratio of (4.2 + or 0.4)x003. Simple functions were found to approximate the collision-induced rotation-translation thermal opacity of H2.
    Keywords: ASTRONOMY
    Type: NASA, Washington Reports of Planetary Astronomy, 1985; p 55-56
    Format: text
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  • 2
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    Pedestal features in dark clouds - A search for radio emission (1985)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Radio emission associated with broad-winged CO sources in B335, L1527, L1455, and L732 was searched for. No detections were made in three of the sources, B335, L1527, and L732. A nonthermal double radio source was found near the focus of the L1455 flow. This source is probably associated with the flow, and may represent a new aspect of the molecular flow phenomenon.
    Keywords: ASTRONOMY
    Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 295; 89-93
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  • 3
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    Multi-spectral Observations of the Star Formation: the Role of Far Infrared Photometry (1984)
    In:  CASI
    Details
    Publication Date: 2014-09-17
    Description: The study and analysis of complex astrophysical process requires a multispectral approach employing many of the tools of modern astronomy. The study of the interaction of early type stars with the interstellar medium is an example of this point. Two examples of multi-spectral studies of individual objects are reviewed. The predominent theme is the combination of high resolution far infrared photometry, radio images and millimeter-wave spectroscopy with the radio sensitive to the ionization, the millimeter-wave lines showing the structure and excitation of the gas and the far infrared providing a picture of the energetics of the dust which connects the star to the interstellar medium. Multispectral observations of FIRSSE and IRAS objects are discussed.
    Keywords: ASTRONOMY
    Type: NASA. Ames Research Center Airborne Astron. Symp.; p 114-126
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  • 4
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    Near-infrared spectrophotometry of four Seyfert 1 galaxies and NGC 1275 (1982)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: Low-resolution spectrophotometry from 2 to 4 microns is reported for the four Seyfert 1 galaxies Mrk 335, 3C 120, Mrk 509, NGC 7469, and the peculiar emission-line galaxy NGC 1275. The spectrum of NGC 7469 exhibits a strong 3.3-micron dust feature, indicating a thermal origin for the bulk of its considerable nonstellar infrared emission. NGC 1275 has a large stellar contribution to its infrared flux at wavelengths shortward of 3 microns. The spectrum from 3 to 4 microns fits a power law which fits the 10-micron and 20-micron broad bands, as well. A thermal model which can explain the spectrum of NGC 1275 is discussed. Mrk 335 displays a complex spectrum suggestive of thermal dust emission. 3C 120 and Mrk 509 have nonstellar infrared emission shortward of 2 microns, but the data are ambiguous as to whether this emission is thermal or nonthermal in origin.
    Keywords: ASTRONOMY
    Type: Astrophysical Journal; vol. 257
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  • 5
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    NASA-Texas Planetary Program (1984)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Astronomical observations performed at the McDonald Observatory were summarized. Various spectra obtained from Jupiter, Uranus, Saturn, Neptune, Pluto, Titan, Iapetus, and sundry asteroids were described briefly. Spectra taken of various comets using an IDS (Intensified Dissector Scanner) spectrograph on a 2.7 m telescope were reviewed. The Octicon, a linear array of eight 1872-element Reticon arrays that was installed in the 2.7 m coude spectrograph at the observatory, was described. The 2.7 m coude scanner, 2.7 m coude CCD (charge coupled device), and 2.7 m radial velocity spectrometer were mentioned.
    Keywords: ASTRONOMY
    Type: NASA-CR-173798 , NAS 1.26:173798
    Format: application/pdf
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  • 6
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    NGC 2024: Far-infrared and radio molecular observations (1984)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Far infrared continuum and millimeter wave molecular observations are presented for the infrared and radio source NGC 2024. The measurements are obtained at relatively high angular resolution, enabling a description of the source energetics and mass distribution in greater detail than previously reported. The object appears to be dominated by a dense ridge of material, extended in the north/south direction and centered on the dark lane that is seen in visual photographs. Maps of the source using the high density molecules CS and HCN confirm this picture and allow a description of the core structure and molecular abundances. The radio molecular and infrared observations support the idea that an important exciting star in NGC 2024 has yet to be identified and is centered on the dense ridge about 1' south of the bright mid infrared source IRS 2. The data presented here allows a presentation of a model for the source.
    Keywords: ASTRONOMY
    Type: NASA-TM-85954 , A-9764 , NAS 1.15:85954
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  • 7
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    The energetics and mass structure of regions of star formation: S201 (1984)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Theoretical predictions about dust and gas in star forming regions are tested by observing a 4 arcmin region surrounding the radio continuum source in 5201. The object was mapped in two far infrared wavelengths and found to show significant extended emission. Under the assumption that the molecular gas is heated solely via thermal coupling with the dust, the volume density was mapped in 5201. The ratios of infrared optical depth to CO column density were calculated for a number of positions in the source. Near the center of the cloud the values are found to be in good agreement with other determinations for regions with lower column density. In addition, the observations suggest significant molecular destruction in the outer parts of the object. Current models of gas heating were used to calculate a strong limit for the radius of the far infrared emitting grains, equal to or less than 0.15 micron. Grains of about this size are required by the observation of high temperature (T equal to or greater than 20 K) gas in many sources.
    Keywords: ASTRONOMY
    Type: NASA-TM-85953 , A-9738 , NAS 1.15:85953
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  • 8
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    The nature of AFGL 2591 and its associated molecular outflow: Infrared and millimeter-wave observations (1984)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The results of infrared photometry from 2 to 160 microns of AFGL and CO(12) observations of its associated molecular cloud and high velocity molecular outflow are presented and discussed. The observed solar luminosity is 6.7 x 10(4) at a distance of 2 kpc. The spectrum of AFGL 2591 is interpreted in the context of a model in which a single embedded object is the dominant source of the infrared luminosity. This object is determined to be surrounded by a compact, optically thick dust shell with a temperature in excess of several hundred degrees kelvin. The extinction to this source is estimated to be between 26 and 50 visual magnitudes. The absolute position of the infrared sources at 10 microns was determined to an accuracy of + or in. This indicates for the first time that the IR source and H2O source are not coincident. The CO(12) observations show the high-velocity molecular flow near AFGL 2591 to be extended, bipolar and roughly centered on the infrared emission. The observations suggest that the red-shifted flow component extends beyond the boundary of the ambient cloud within which AFGL 2591 is embedded. The CO(12) observations also show that AFGL 2591 is embedded in a molecular cloud with an LSR velocity of -5 km/s.
    Keywords: ASTRONOMY
    Type: NASA-TM-85963 , A-9757 , NAS 1.15:85963
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  • 9
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    Molecular hydrogen and the 2 micron spectrum of NGC 7027 (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The spectrum of the planetary nebula NGC 7027 in the range 1.6-2.5 microns was obtained with a resolution of 1.2 per cm. The presence of molecular hydrogen emission in the v = 1-0 S(1), Q(1), and Q(3) lines is confirmed, and the detection of H2 lines v = 1-0 Q(2), Q(4), S(0), and S(2) is reported. The H2 line strengths, with upper limits for the v = 2-1 band, suggest a model in which the emitting gas is confined to clumps heated by a shock front accompanying an expanding H II region. Emission lines are also detected from atomic hydrogen (Pfund and Brackett series) and from He I and He II.
    Keywords: ASTRONOMY
    Type: Astrophysical Journal; vol. 244
    Format: text
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  • 10
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    N-body experiments and missing mass in clusters of galaxies (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: It is commonly assumed that the distributions of surface density and radial-velocity dispersion in clusters of galaxies are sensitive tracers of the underlying distribution of any unseen mass. N-body experiments have been used to test this assumption. Calculations with equal-mass systems indicate that the effects of the underlying mass distribution cannot be detected by observations of the surface-density or radial-velocity distributions, and the existence of an extended binding mass in all well-studied clusters would be consistent with available observations.
    Keywords: ASTRONOMY
    Type: Astrophysical Journal; vol. 234
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