Continuous Emission in the Spectra of Gaseous Nebulae.
نویسندگان
چکیده
منابع مشابه
Emission lines of [K V] in the optical spectra of gaseous nebulae.
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 a...
متن کاملIonization Structure and Spectra of Iron in Gaseous Nebulae
The emission spectra and the ionization structure of the low ionization stages of iron, Fe I–IV, in gaseous nebulae are studied. This work includes: (i) new atomic data: photoionization cross sections, total e-ion recombination rates, excitation collision strengths, and transition probabilities calculated under the Iron Project by the Ohio State atomic-astrophysics group; (ii) detailed study of...
متن کاملEvolution of Gaseous Nebulae.
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...
متن کاملTheoretical emission line ratios for [Fe III] and [Fe VII] applicable to the optical and infrared spectra of gaseous nebulae.
Recent calculations of electron impact excitation rates and Einstein A-coefficients for transitions among the 3d(6) levels of Fe III and among the 3d(2) levels of Fe VII are used to derive theoretical emission line ratios applicable to the optical and infrared spectra of gaseous nebulae. Results for [Fe III] are generated for electron temperatures T(e) = 7,000-20,000 K and densities N(e) = 10(2...
متن کاملThe vibration-rotation emission spectra of gaseous CdH2 and CdD2.
The vibration-rotation emission spectra of CdH2 and CdD2 molecules have been recorded at high resolution using a Fourier-transform spectrometer. The molecules were generated in a furnace-discharge emission source by reaction of cadmium vapor with molecular hydrogen or deuterium. The fundamental bands for the antisymmetric stretching mode (upsilon3) of CdH2 and CdD2 were detected at about 1771.5...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: The Astrophysical Journal
سال: 1942
ISSN: 0004-637X,1538-4357
DOI: 10.1086/144461