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  • ASTRONOMY  (12)
  • 1
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    Star formation in the merging Galaxy NGC3256 (1987)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The central 5 kpc of the ultra-luminous merging galaxy NGC 3256 was mapped at J, H, K, L, and 10 micrometer, and a 2 micrometer spectra of the nuclear region was obtained. This data was used to identify and characterize the super starburst which has apparently been triggered and fuelled by the merger of two gas rich galaxies. It is also shown that the old stellar population has relaxed into a single spheroidal system, and that a supernova driven wind might eventually drive any remaining gas from the system to leave a relic which will be indistinguishable from an elliptical galaxy.
    Keywords: ASTRONOMY
    Type: NASA, Washington Star Formation in Galaxies; p 517-519
    Format: application/pdf
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  • 2
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    Orbits of nine Uranian rings (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Observations of a stellar occultation by Uranus and its nine rings are presented and used to examine the structures and kinematics of the rings. The observations of the occultation of the K giant star KM 12 were obtained in the K band with the 4-m CTIO telescope at a signal-to-noise ratio higher than any previously obtained. Ring occultation profiles reveal the alpha ring to possibly have a double structure and less abrupt boundaries than the gamma ring, which exhibits diffraction fringes, while the eta ring is a broad ring with an unresolved narrow component at its inner edge. The present timing data, as well as previous occultation timings, are fit to a kinematic model in which all nine rings are treated as coplanar eclipses of zero inclination, precessing due to the zonal harmonics of the Uranian gravitational potential to obtain solutions for the ring orbits. Analysis of the residuals from the fitted orbits reveals that the proposed model is a good representation of ring kinematics. The reference system defined by the orbit solutions has also been used to obtain a value of 0.022 + or - 0.003 for the ellipticity of Uranus and a Uranian rotation period of 15.5 h.
    Keywords: ASTRONOMY
    Type: Astronomical Journal; 86; Mar. 198
    Format: text
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  • 3
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    1.0 Mm Maps and Radial Density Distributions of Southern Hii/molecular Cloud Complexes (1980)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Several 1.0 continuum mapping observations were made of seven southern hemisphere h12/molecular cloud complexes with 65 arcsec resolution. The radial density distribution of the clouds with central luminosity sources was determined observationally. Strong similarities in morphology and general physical conditions were found to exist among all of the southern clouds in the sample.
    Keywords: ASTRONOMY
    Type: NASA-TM-80654
    Format: application/pdf
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  • 4
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    The 20 March 1980 occultation by the Uranian rings (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: On March 20, 1980, observations of occultations by rings alpha, beta, gamma, delta, and epsilon were observed from Cerro Tololo and Sutherland. A model ring profile was fit to the data to obtain the midtimes of the occultations and the widths of the profiles. A 14-parameter kinematic model, including J sub 2, J sub 4, and some of the orbital elements for rings 4, alpha, beta, and epsilon as free parameters, was fit to these data and previous ring occultation timings. The results yield J sub 2 = (3.396 + or - 0.020) x 10 to the -3 and a 2 sigma upper limit, absolute value of J sub 4 less than 7 x 10 to the -5th. Uniform precession models for rings alpha, beta are established and the dispersion in the values of semimajor axes and eccentricities for rings alpha, beta, and epsilon have been obtained. If self-gravity is the cause of the uniform precession, the mass of the beta ring is estimated at approximately 4 x 10 to the 16th g; the mass of the alpha ring probably is also near this value.
    Keywords: ASTRONOMY
    Type: Astronomical Journal; 86; Jan. 198
    Format: text
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  • 5
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    Photometric studies of composite stellar systems. III - UBVR and JHK observations of E and S0 galaxies (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Infrared (JHK) photometry is presented for a sample of E and S0 galaxies. The sample comprises 80 field galaxies, 35 galaxies in the Virgo cluster, and 22 in the Coma cluster. The galaxies span a range of 6 mag in absolute magnitude. Multiaperture UBVR photometry for 107 field galaxies is also presented. The infrared data are combined with these optical data or with published optical data to give V-K colors. This paper describes the observational techniques and lists the data.
    Keywords: ASTRONOMY
    Type: Astrophysical Journal Supplement Series; 39; Jan. 197
    Format: text
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  • 6
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    Stellar content of the nuclei of elliptical galaxies determined from 2.3 micron CO band strengths (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Observations of the luminosity sensitive CO absorption band at 2.3 micron are presented for the nuclei of 16 epsilon and SO galaxies. Preliminary data on the radial variation of the CO index in 6 galaxies are also given. The data show that the 2-u radiation from the nuclei is dominated by high luminosity stars of integrated spectral type later than K5. There is only a small variation in the CO absorption from galaxy to galaxy, and only a slight variation with measuring aperture size from 17.5 in. to 59 in. The data can be used to synthesize stellar populations for elliptical galaxy nuclei.
    Keywords: ASTRONOMY
    Type: NASA-CR-140859
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  • 7
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    Broad-band infrared colors and CO and H2O absorption indices for late-type dwarf stars (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Keywords: ASTRONOMY
    Type: Astronomical Journal; 82; Sept
    Format: text
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  • 8
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    Infrared standard stars (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The results of an observational program aimed at setting up a network of faint near-infrared standards of sufficient accuracy are reported. The network covers both northern and southern hemispheres and includes standards red enough to provide at least a limited check on color transformations. The standards are set up at J (1.2 micron), H (1.6 micron), K (2.2 microns), and L (3.5 microns), and their H2O and CO molecular absorption indices are determined. The problem of color transformations between observatories is discussed briefly. All magnitudes presented are transformed to the natural system defined by the CIT observations.
    Keywords: ASTRONOMY
    Type: Astronomical Journal; 87; July 198
    Format: text
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  • 9
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    Photometric studies of composite stellar systems. II - Observations of H2O absorption and the coolest stellar component of E and S0 galaxies (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Keywords: ASTRONOMY
    Type: Astrophysical Journal; vol. 220
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  • 10
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    Photometric studies of composite stellar systems. I - CO and JHK observations of E and S0 galaxies (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Multiaperture infrared photometric observations of the central regions of 51 early-type galaxies and of the integrated light of five globular clusters are presented. These data are compared with selected optical observations and with various model predictions. The main results of the work are: (1) the observed parameters for the brighter galaxies, particularly the CO index and the V-K color, agree with the predictions of stellar synthesis models characterized by giant-dominated populations with mass/visual luminosity ratios less than 10; (2) the galaxian broad-band colors tend to redden with increasing luminosity and decreasing aperture size; (3) for the globular clusters, there is evidence that the integrated colors become redder with increasing metallicity; and (4) in bright galaxies the relative changes of U-V, V-J, and J-K as functions of radius may differ from the relative changes as functions of luminosity at a fixed radius.
    Keywords: ASTRONOMY
    Type: Astrophysical Journal; vol. 220
    Format: text
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