Search

Your search keyword '"Aller, Lawrence H."' showing total 235 results
Start Over Author "Aller, Lawrence H."
235 results on '"Aller, Lawrence H."'

218. Spectral Line Intensity Variations in Planetary Nebulae

Author

ALLER, LAWRENCE H. and WARES, GORDON

Abstract

Evans, Catchpole and Jones1recently suggested that the small southern planetary nebula, IC 4642, shows striking spectral changes. They compared eye estimates of intensity on low dispersion spectrograms with low-resolution scanner measurements published by Aller and Faulkner2.

Published
1969
Full Text
View/download PDF

223. Astrophysical Concepts (Book Review).

Author

Aller, Lawrence H.

Subjects
*ASTROPHYSICS, *NONFICTION
Abstract

Reviews the book 'Astrophysical Concepts,' by Martin Harwit.

Published
1975

225. Variable Stars

Author

Ledoux, P., Walraven, Th., Flügge, S., editor, Wrubel, Marshal H., Arp, H. C., Burbidge, G. R., Burbidge, E. Margaret, Suess, Hans E., Urey, Harold C., Aller, Lawrence H., Ledoux, P., Walraven, Th., Deutsch, Armin J., Schatzman, E., Payne-Gaposchkin, Cecilia, and Zwicky, F.

Published
1958
Full Text
View/download PDF

226. Stellar Stability

Author

Ledoux, P., Flügge, S., editor, Wrubel, Marshal H., Arp, H. C., Burbidge, G. R., Burbidge, E. Margaret, Suess, Hans E., Urey, Harold C., Aller, Lawrence H., Ledoux, P., Walraven, Th., Deutsch, Armin J., Schatzman, E., Payne-Gaposchkin, Cecilia, and Zwicky, F.

Published
1958
Full Text
View/download PDF

227. Théorie des naines blanches

Author

Schatzman, E., Flügge, S., editor, Wrubel, Marshal H., Arp, H. C., Burbidge, G. R., Burbidge, E. Margaret, Suess, Hans E., Urey, Harold C., Aller, Lawrence H., Ledoux, P., Walraven, Th., Deutsch, Armin J., Schatzman, E., Payne-Gaposchkin, Cecilia, and Zwicky, F.

Published
1958
Full Text
View/download PDF

228. Magnetic Fields of Stars

Author

Deutsch, Armin J., Flügge, S., editor, Wrubel, Marshal H., Arp, H. C., Burbidge, G. R., Burbidge, E. Margaret, Suess, Hans E., Urey, Harold C., Aller, Lawrence H., Ledoux, P., Walraven, Th., Deutsch, Armin J., Schatzman, E., Payne-Gaposchkin, Cecilia, and Zwicky, F.

Published
1958
Full Text
View/download PDF

229. The Novae

Author

Payne-Gaposchkin, Cecilia, Flügge, S., editor, Wrubel, Marshal H., Arp, H. C., Burbidge, G. R., Burbidge, E. Margaret, Suess, Hans E., Urey, Harold C., Aller, Lawrence H., Ledoux, P., Walraven, Th., Deutsch, Armin J., Schatzman, E., Payne-Gaposchkin, Cecilia, and Zwicky, F.

Published
1958
Full Text
View/download PDF

230. Die Häufigkeit der Elemente in den Planeten und Meteoriten

Author

Suess, Hans E., Urey, Harold C., Flügge, S., editor, Wrubel, Marshal H., Arp, H. C., Burbidge, G. R., Burbidge, E. Margaret, Suess, Hans E., Urey, Harold C., Aller, Lawrence H., Ledoux, P., Walraven, Th., Deutsch, Armin J., Schatzman, E., Payne-Gaposchkin, Cecilia, and Zwicky, F.

Published
1958
Full Text
View/download PDF

231. Stellar Evolution

Author

Burbidge, G. R., Burbidge, E. Margaret, Flügge, S., editor, Wrubel, Marshal H., Arp, H. C., Burbidge, G. R., Burbidge, E. Margaret, Suess, Hans E., Urey, Harold C., Aller, Lawrence H., Ledoux, P., Walraven, Th., Deutsch, Armin J., Schatzman, E., Payne-Gaposchkin, Cecilia, and Zwicky, F.

Published
1958
Full Text
View/download PDF

232. Stellar Interiors

Author

Wrubel, Marshal H., Flügge, S., editor, Wrubel, Marshal H., Arp, H. C., Burbidge, G. R., Burbidge, E. Margaret, Suess, Hans E., Urey, Harold C., Aller, Lawrence H., Ledoux, P., Walraven, Th., Deutsch, Armin J., Schatzman, E., Payne-Gaposchkin, Cecilia, and Zwicky, F.

Published
1958
Full Text
View/download PDF

233. The Hertzsprung-Russell Diagram

Author

Arp, H. C., Flügge, S., editor, Wrubel, Marshal H., Arp, H. C., Burbidge, G. R., Burbidge, E. Margaret, Suess, Hans E., Urey, Harold C., Aller, Lawrence H., Ledoux, P., Walraven, Th., Deutsch, Armin J., Schatzman, E., Payne-Gaposchkin, Cecilia, and Zwicky, F.

Published
1958
Full Text
View/download PDF

234. Supernovae

Author

Zwicky, F., Flügge, S., editor, Wrubel, Marshal H., Arp, H. C., Burbidge, G. R., Burbidge, E. Margaret, Suess, Hans E., Urey, Harold C., Aller, Lawrence H., Ledoux, P., Walraven, Th., Deutsch, Armin J., Schatzman, E., Payne-Gaposchkin, Cecilia, and Zwicky, F.

Published
1958
Full Text
View/download PDF

235. Emission lines of [K V] in the optical spectra of gaseous nebulae.

Author

Keenan FP, Aller LH, Espey BR, Exter KM, Hyung S, Keenan MT, Pollacco DL, and Ryans RS

Abstract

Recent R-matrix calculations of electron impact excitation rates in K v are used to derive the nebular emission line ratio R = I(4122.6 A)/I(4163.3 A) as a function of electron density (N(e)). This ratio is found to be very sensitive to changes in N(e) over the density range 10(3) to 10(6) cm(-3), but does not vary significantly with electron temperature, and hence in principle should provide an excellent optical N(e) diagnostic for the high-excitation zones of nebulae. The observed value of R for the planetary nebula NGC 7027, measured from a spectrum obtained with the Hamilton Echelle spectrograph on the 3-m Shane Telescope, implies a density in excellent agreement with that derived from [Ne iv], formed in the same region of the nebula as [K v]. This observation provides observational support for the accuracy of the theoretical [K v] line ratios, and hence the atomic data on which they are based. However, the analysis of a high-resolution spectrum of the symbiotic star RR Telescopii, obtained with the University College London Echelle Spectrograph on the 3.9-m Anglo-Australian Telescope, reveals that the [K v] 4122.6 A line in this object is badly blended with Fe ii 4122.6 A. Hence, the [K v] diagnostic may not be used for astrophysical sources that show a strong Fe ii emission line spectrum.

Published
2002
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results