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At least 541 records · Page 30
All sourcesNASA NTRSDOE OSTI
NASA NTRS1973

Kinematics of the Huyghenian region of the Orion Nebula.

Palomar data published by Wilson et al. (1959) on Orion Nebula wavelength 3726 and 5007 forbidden OII and OIII emission lines have been used to construct a presented pair of contour maps of isovelocities in intervals of 2.5 km/sec. The space motions of theta-1 and theta-2 Ori stars and nebula measurements are discussed.

Fischel, D.↗
NASA NTRS1973

Dust emission nebulae around Orion O and B stars.

The intense long-wave radiation is discussed that has been found to arise from regions surrounding six early stars in the Orion Nebula. The emission regions are very red and have angular sizes up to 25 seconds of arc. Twenty other early stars were observed, and none showed the long-wave excess.

Ney, E. P.↗
NASA NTRS1973

On the nature of the infrared point source in the Orion Nebula.

New photometric observations of the BN infrared source in the Orion Nebula eliminate the possibility that it is simply a highly reddened star, and undermine the conclusion that there are 80 mag of visual extinction to the source. We suggest that there is a generic relationship between it and the infrared source IRS 5 in the H II region W3.

Becklin, E. E.↗
NASA NTRS1973

2.2- and 3.5-micron polarization measurements of the Becklin-Neugebauer object in the Orion Nebula.

Independent measurements of the Becklin-Neugebauer (BN) object in the Orion Nebula yield large values of linear polarization in wavelength bands centered at 2.2 and 3.4 microns. The 10 to 15% polarization at 2.2 microns of the BN object is larger than any yet measured for an extraterrestrial object. The large polarization probably originates from the scattering of the radiation by dust grains.

Loer, S. J.↗
NASA NTRS1973

Linear polarization in the Orion Nebula.

Photographs of the central portion of the Orion Nebula indicate small variations in polarization as a function of rotation of the polarizing filter. The effects are observed only in an area east of the Trapezium and only in the red region of the spectrum.

Feibelman, W. A.↗
NASA NTRS1974

Isotopic abundances and line formation in the Orion Nebula

Measurements of the spatial variation of HC-12N-14 and HC-13N-14 line emission from the molecular cloud associated with the Orion Nebula indicate that HC-12N-14 has a high central opacity. This result seems to contradict a recent suggestion that the observed hyperfine structure of the line indicates a low opacity, which in turn would yield a C-13/C-12 abundance significantly different from other determinations. The observed hyperfine structure can be understood in the high-opacity case if radiative trapping in the lines is considered.

Wannier, P. G.↗
NASA NTRS1974

CO and CS in the Orion Nebula

The reported observations were made with an 11-m radio telescope. The CO map considered has a peak near the position of the infrared continuum source. There is little correlation between the CO contours and any optical structure. The CO contours show a pronounced north-south orientation. CS was observed as a representative example of a stable molecule with a higher dipole moment than CO. Questions regarding the structure of Orion A are discussed, giving attention to various models.

Liszt, H. S.↗