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Kovar, N. S.

Publications and source records attributed to Kovar, N. S..

7 records
All sourcesNASA NTRSDOE OSTI
NASA NTRS1972

Paschen beta emission in the spectrum of Omicron Ceti.

Evaluation of three infrared spectra of Omicron Ceti obtained on Aug. 7 to 11, 1969. The equivalent width of the Paschen beta emission line in these spectra was found to vary by a factor of 2 during this time period. The variation was similar to that for H gamma and H delta as measured by Odell et al. (1970) for the same time span. The equivalent widths of Paschen beta and H gamma on August 7 were used to estimate an opacity ratio of kappa (1.28 micron)/kappa (0.43 micron) about equal to 1:30 and a molecular/atomic hydrogen ratio of about 10. The variation in the strength of Paschen beta and H delta lines is considered to be intrinsic and to have a time scale of less than or about equal to 100,000 sec.

Kovar, R. P.↗
NASA NTRS1971

The infrared spectrum of IC 418.

Observations of the intensities of the Paschen lines in the spectrum of IC 418 together with published measurements of the Balmer-line intensities are utilized to derive a reddening constant, c = 0.31. Two additional emission lines, one at 1.087 micron and the second at 1.698 micron, are briefly discussed.

Kovar, R. P.↗
NASA NTRS1971

Supporting studies for the coronagraph contamination experiment

Calculations of Mie scattering functions involved individual as well as mixed scattering of particles. In particular, computations were completed for a 15A particle and for particles subjected to incident light of ultraviolet wavelengths. Calculations of contaminant atmospheres for Gemini, Apollo, and Skylab considered leakage rates for the respective vehicles and the mass column density of the atmospheres surrounding them. Atmospheres for these vehicles have been computed for a uniform particle size distribution, and for a particle size distribution in which size varied.

Kovar, N. S.↗