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  • 1
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    IRAS observations of radio-quiet and radio-loud quasars (1984)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: Observations from 12 to 100 microns are presented of two radio-quiet and three radio-loud quasars. Over this wavelength range, all five have grossly similar continuum energy distributions. The continua of the radio-loud quasars are consistent with synchrotron radiation. There is an indication, however, of excess 100 micron emission in the two radio-quiet quasars.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X); 278; L83-L85
    Format: text
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  • 2
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    IRAS observations of Shapley-Ames galaxies (1984)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: A preliminary discussion of the infrared properties of a representative subsample of galaxies in the Revised Shapley-Ames Catalog (B less than about 13 mag) is presented. Of the 165 galaxies in the sample, 108 predominantly spiral galaxies, are detected in the infrared by IRAS. None of the elliptical galaxies and only about 25 percent of the lenticular galaxies scanned were detected. The range of infrared-to-blue luminosity ratios, a measure of the infrared excess of galaxies, is large, varying from roughly 0.1 to roughly 5. The data suggest that weakly infrared emitting galaxies are cool (100-60 micron color temperatures of about 25 K), while the more infrared luminous ones tend to be warmer (about 50 K). The rate of star formation in barred spiral galaxies is apparently higher than in normal spirals. About 1 solar mass/year of interstellar matter is converted into massive stars in the typical spiral galaxy.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X); 278; L67-L70
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  • 3
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    Infrared astronomical satellite (IRAS) catalogs and atlases. Volume 1: Explanatory supplement (1988)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The Infrared Astronomical Satellite (IRAS) was launched on January 26, 1983. During its 300-day mission, IRAS surveyed over 96 pct of the celestial sphere at four infrared wavelengths, centered approximately at 12, 25, 60, and 100 microns. Volume 1 describes the instrument, the mission, and data reduction.
    Keywords: ASTROPHYSICS
    Type: NASA-RP-1190-VOL-1 , NAS 1.61:1190-VOL-1
    Format: application/pdf
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  • 4
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    Isotopes of titanium in cool stars (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: A program of stellar Ti isotopic-abundance determinations is described and related to changes that may have occurred in the Ti isotopic abundance ratios during the chemical evolution of the Galaxy, and to whether the abundance ratios are perturbed in the S and MS stars having atmospheres with enhanced abundances of s-process nuclei resulting from convective mixing after internal exposure to neutrons. High-resolution (0.07 A) Reticon spectra of portions of the TiO gamma (0,0), gamma (0,1), and delta (0,0) bands were the source material, and particular emphasis was placed on the definition of the continuum level. The isotopic abundance ratios are terrestrial in all of the sample, and errors in the (Ti-i)/(Ti-48) ratio are typically plus or minus 25% for the dwarfs and plus or minus 50% for the giants. The observations show that the magic nucleus Ti-50 is not enhanced in S and MS stars.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal; vol. 234
    Format: text
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  • 5
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    Carbon and nitrogen abundances in F- and G-type stars (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Carbon and nitrogen abundances have been obtained for a sample of 11-F- and G-type dwarfs covering a range in Fe/H abundance ratio from -0.8 to +0.3. Model atmospheres, which included the effects of convection and line blanketing, were used to calculate synthetic spectra of the CH, CN, and NH molecular bands. Effective oscillator strengths for the bands studied were found by matching synthetic spectra calculated from a model solar atmosphere with the observed solar bands. Many of the metal-poor stars, and particularly the high-velocity stars, were found to have substantial nitrogen over-deficiencies, suggesting that N is manufactured mostly in a secondary manner. The carbon-to-iron ratios were similar to the solar ratio, although there may be slight C over-deficiencies in metal-poor stars. However, the variation in C/Fe is not as marked as that found recently by Hearnshaw (1974). A comprehensive discussion of the theoretical errors is given, and some applications to Galactic evolution are noted.
    Keywords: ASTROPHYSICS
    Type: Royal Astronomical Society; vol. 181
    Format: text
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  • 6
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    Astrophysical masers; Proceedings of the Conference, Arlington, VA, Mar. 9-11, 1992 (1993)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: Various papers on astrophysical masers are presented. The general topics addressed include: theory, maser surveys, extragalactic masers, masers in star-forming regions (general), OH masers in star-forming regions, water masers in star-forming regions, methanol masers in star-forming regions, proper motions, scattering, variability, circumstellar masers (general), circumstellar OH masers, circumstellar water masers, circumstellar SiO masers, and solar system masers.
    Keywords: ASTROPHYSICS
    Type: ; 499 p.
    Format: text
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  • 7
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    Rotation measures of low-latitude extragalactic sources and the magnetoionic structure of the Galaxy (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: Faraday rotation measurements of 56 extragalactic sources obtained predominantly in the range 45-93 deg, /b/ less than 5 deg are reported. Within the longitude range sampled in the present study, RM(l) = 1600 sin (l0 - l) rad/sq m, with a null in RM occurring at 62 deg. Under the assumption of a uniform circular geometry for the magnetic field lines, it is argued that the magnetoionic medium must exist to a Galactocentric radius of about 25 kpc to produce the observed magnitudes of the RMs, where it is assumed that ne and /B/ equal their local values of 0.03/cu cm and 2.1 micro-G out to Rm. The medium must exist to an even greater radius if ne and/or /B/ decrease with R, as is likely. Comparison of extragalactic and pulsar RMs along nearly coincident lines of sight is consistent with at least one field reversal exterior to the radius of the solar orbit about the Galactic center.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 386; 143-157
    Format: text
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  • 8
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    Infrared emission from M31 (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: Maps of M31 have been obtained at wavelengths of 12, 25, 60, and 100 microns. Emission is detected from the center and from a ring of 50 arcmin radius. The ring is that also seen in H I, in H II, and in radio continuum radiation. The spectrum of the central emission suggests a hotter dust temperature than in the ring. M31 is a weak infrared source, the radiation measured longward of 12 microns being only 3 percent of its total luminosity. The two closest companion galaxies, M32 and NGC 205, have also been detected.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X); 278; L59-L62
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  • 9
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    HST imaging of hydrogen-poor ejecta in Abell 30 and Abell 78 - Wind-blown cometary structures (1993)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: HST Faint Object Camera images of hydrogen-poor gas in the planetary nebulae A30 and A78 have revealed remarkable 'cometary' structures in the O III 5007-A forbidden line. Most of these cometary structures, consisting of compact (0.15-0.5 arcsec) knots with radial tails several arcsec in length, are located in an equatorial plane in both nebulae. In addition, two bright, compact (0.3 arcsec) polar knots are present in A30, one of them forming a bow shock. Corresponding polar features in A78 are more diffuse. The central stars of both nebulae have energetic winds which are most likely responsible for the 'cometary' knot morphology. We interpret this morphology in terms of dense (several thousand electrons per cu cm) H-poor condensations whose outer expanding layers are swept outward by stellar winds. Photoionization modeling indicates that while dense knot cores are mostly heated by atomic photoionization, expanding tenuous gas is heated by photoelectrons ejected from abundant dust grains. Our models predict steep temperature gradients for which there is observational evidence and possible abrupt phase transitions in the expanding gas.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X); 415; 1; p. L47-L50.
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