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Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.

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At least 109 records · Page 6
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NASA NTRS1972

Absolute ultraviolet spectrophotometry of Alpha Canis Majoris, Gamma Orionis, Kappa Orionis and Alpha Leonis

Spectral observations of the stars Alpha Canis Majoris, Gamma Orionis, Kappa Orionis and Alpha Leonis have been obtained in the range 1150-4000 A, using rocket borne spectrometers. The payloads have a 13-inch diameter telescope, a rotatable concave diffraction grating, and three pulse counting photomultiplier photometers. The observations are systematically lower than those of Carruthers (1968) at 1270 A, of Smith (1967) at 1376 A, and of Campbell (1970) at 2150 and 2550 A. The data are also about 15 percent lower than the ground-based photometry reported by Schild, Peterson and Oke (1971). The OAO-2 short wavelength scanner calibration agrees with the alpha Leo observations, but disagrees for Kappa Ori and Gamma Ori.

Evans, D. C.↗
NASA NTRS1972

Spectrophotometry of beta Lyrae

Two hundred and fourteen scans over the wavelength region 1100 A to 1800 A with 10 A resolution were obtained by OAO spacecraft for the eclipsing binary Beta Lyrae between JD 2440889.5 and JD 2440904.5. Preliminary results indicate that: (1) The intensity at primary minimum is almost exactly one-half that at maximum and that the primary eclipse is less deep than that in the visual or longer ultraviolet wavelengths; (2) except for the 1100 to 1200 A region, the depth of the primary eclipse appears independent of wavelength; (3) the energy distribution at secondary minimum is similar to that at primary; (4) the two most prominent emission lines match well both with Si IV and C IV emission observed in gamma Vel and imply an exciting source of high temperature; (5) the emission lines do not show variation with phase.

Houck, T. E.↗
NASA NTRS1972

Ultraviolet spectrophotometry of Arcturus from a rocket.

Results of spectrophotometric observations of Arcturus were obtained at the resolution of about 7 A in the wavelength region from 2700 to 4000 A from an Aerobee rocket. Although the payload was capable of obtaining observations shortward of 2700 A, the stellar flux was too weak for meaningful measurements below that wavelength. The most significant feature in the ultraviolet shortward of the atmospheric cutoff is an emission feature at 2800 A identified as the resonance line of the Mg II doublet.

Kondo, Y.↗
NASA NTRS1972

Spectrophotometry of the 1.5-micron window of Jupiter.

The limb darkening of the 1.5-micron region and the variations of ammonia and methane absorptions over the Jovian belts, zones, and spots are studied on the basis of high-resolution infrared spectrometric data obtained for 86 areas on the Jovian surface. It is shown that the absorptions increase with increasing air mass between the equator and the poles, that they decrease linearly with increasing air mass between the central meridian and the limbs, and that the absorptions over the South Tropical Zone are greater and those over the Great Red Spot are smaller than the absorptions for other features. An ammonia absorption map of the planet is plotted for the period April-June, 1970.

Binder, A. B.↗
NASA NTRS1972

Spectrophotometry /0.3 to 1.1 micron/ of visited and proposed Apollo lunar landing sites.

The study uses information gained by analysis of the spectral properties of lunar samples in the laboratory, and telescope spectra of over 100 lunar areas, to provide information regarding the composition and mineralogy of each proposed lunar landing site. Attention is given to (1) the presence of pyroxenes which cause an absorption band near 0.95 micron in the lunar reflection spectrum, (2) the proportion of crystalline to glassy material present in the soil which is derived from the slope of the reflectivity curve between 0.4 and 0.7 micron and the strength of the 0.95 micron absorption band, and (3) the presence of Ti(3+) ions in the glasses on the lunar surface, which affects the reflection spectrum at blue and ultraviolet wavelengths.

Mccord, T. B.↗
NASA NTRS1973

Spectrophotometry of planetary atmosphere from the X-15 rocket airplane

Nike-Apache and Nike-Tomahawk rocket flights using spectrophotometric techniques to investigate auroral activity are reported. The specific objectives were to obtain data relative to typical auroral situations, including quiet pre-breakup auroras, westward traveling surges, breakup auroras, and post-breakup auroras. It was found that excited atoms move considerable distances between excitation and emission owing to the high velocity wind conditions prevailing above 200 km. Based on the results of these observations, recommendations are made for future studies of ionized atmospheric activity at higher altitudes.

Murcray, W. B.↗
NASA NTRS1973

Spectrophotometry of Ton 524a, b.

Spectra of Ton 524a, b show that these two compact emission-line galaxies have nearly identical redshifts. This is the first pair of Seyfert-like galaxies that appear to form a physical pair.

Robinson, L. B.↗
NASA NTRS1974

Infrared photometry and spectrophotometry of Titan

The wide variation in infrared brightness temperature of Titan is explained in terms of a greenhouse effect. Radiometric observations in the infrared and microwave frequencies indicate an alternate hot atmospheric model. Methane, ammonia, hydrogen atoms, and nitrogen atoms are suggested as main constituents for the Titan atmosphere.

Morrison, D.↗
NASA NTRS1974

Photoelectric spectrophotometry of OQ 172 and OH 471

Absolute spectral energy distributions for the large redshift quasars OQ 172 and OH 471 are discussed along with similar data for two other quasars 4C05.34 and PHL 957. Assuming cosmological redshifts, OQ 172 and OH 471 are not as luminous as PHL 957. If these quasars are basically similar and if radiative processes dominate, the strength of Ly alpha and the behavior of the continuum at the Lyman limit strongly suggest that these objects consist of a central ionizing source surrounded by discrete clouds, filaments or a gaseous structure such as a disk. This gaseous matter does not cover the whole solid angle surrounding the source.

Oke, J. B.↗
NASA NTRS1974

Spectrophotometry of comets

Photoelectric spectrophotometric- and image tube equipped spectrographic-studies on comets are used to formulate a new model for the cometary nucleus that is physically similar to the icy-conglomerate. Absolute flux distributions of the principal spectral features for five comets of different compositions and heliocentric distances were evaluated. Comparison of visible and infrared brightnesses was used to calculate the optical albedos of observed particles.

Odell, C. R.↗
NASA NTRS1973

IR spectrophotometry of Jupiter and Saturn

High spatial resolution spectrophotometric observations (from 0.6 to 2.0 microns) are used to study the Jovian and Saturnian limb darkening at 0 deg phase angle. The limb-darkening coefficients (k) of the Minnaert function are 1.0 over Jupiter's entire disk and between 0.75 and 0.90 for different latitudes on Saturn. These data are used to derive geometric albedoes (G) for the various belts, zones, spots, and regions observed on Jupiter and Saturn. These values of G and k are in turn used to show that an isotropic scattering model is invalid for Jupiter and that at least an asymmetric scattering function, such as the Euler function, is needed to fit the Jovian data. The Jovian scattering function is found to generally vary between 0.960 (1 + 0.85 cos theta) and 0.994 (1 + 0.42 cos theta) as a function of wavelength and the feature observed. The Saturn geometric albedoes and values of k indicate that Euler's function fails to adequately model the scattering properties of Saturnian clouds; they may be better represented by a cumulus cloud model.

Binder, A. B.↗
NASA NTRS1974

Photoelectric spectrophotometry of OQ 172 and OH 471

Absolute spectral energy distributions for the large-redshift quasars OQ 172 and OH 471 are discussed along with similar data for two other quasars: 4C 05.34 and PHL 957. If the redshift are assumed to be cosmological, OQ 172 and OH 471 are not as luminous as PHL 957. If these quasars are basically similar and if radiative processes dominate, the strength of alpha and the behavior of the continuum at the Lyman limit strongly suggest that these objects consist of a central ionizing source surrounded by discrete clouds, filaments, or a gaseous structure such as a disk. This gaseous matter does not cover the whole solid angle surrounding the source.

Oke, J. B.↗
NASA NTRS1974

Rocket ultraviolet spectrophotometry of Comet Kohoutek /1973f/

On January 5, 1974, the ultraviolet emissions from Comet Kohoutek (1973f) in the spectral range from 1200 to 3200 A were studied with the aid of a rocket carrying two spectrophotometers. In addition to the Lyman alpha line of atomic hydrogen at 1216 A and the (0,0) and (1,1) bands of OH at 3090 and 3142 A, both atomic oxygen (1304 A) and atomic carbon (1657 and 1561 A) were detected.

Feldman, P. D.↗