The Gaseous Nebulæ
نویسندگان
چکیده
منابع مشابه
On the distances of planetary nebulæ
Reconsidering calibration of statistical distance scales for planetary nebulæ leads naturally to examining precision and especially the systematic errors of other methods. Here we present a different calibration strategy based on the precise trigonometric parallaxes for sixteen central stars published by Harris et al. (2007) of USNO, with four improved by Benedict et al. using the Hubble Space ...
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The SMC harbours a class of hot nitrogen-sequence Wolf-Rayet stars (WNE) that display only relatively weak broad emission lines. This indicates low mass-loss rates and makes them also hard to detect. However, such stars are possible emitters of strong He Lyman continua that in turn could ionize observable He iii regions, i.e. highly excited H ii regions emitting nebular He iiλ4686 emission. We ...
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55Swain, F. M., A Blumentals, and N. Prokopovich, "Bituminous and other organic substances in Pre-Cambrian of Minnesota," Am. Assoc. Petrol. Geol. Bull., 42, 173-189 (1958). M Timofeev, B. V., "Spores and phytoplankton from Proterozoic and early Paleozoic of Eurasia," in Proc. 21st Int. Geol. Congr., Copenhagen, Rept. Soviet Geologists, Problem 9, 177-188 (1960) (in Russian; English abstract, p...
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ژورنال
عنوان ژورنال: Nature
سال: 1923
ISSN: 0028-0836,1476-4687
DOI: 10.1038/112375a0