Measurements in the Spectra of U Orionis, R Serpentis, R Aquilae, and R Cassiopeiae.
1945; IOP Publishing; Volume: 102; Linguagem: Inglês
10.1086/144763
ISSN1538-4357
Autores Tópico(s)Scientific Research and Discoveries
Resumoview Abstract Citations (10) References Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Measurements in the Spectra of U Orionis, R Serpentis, R Aquilae, and R Cassiopeiae. Merrill, Paul W. Abstract This Contribution is the first of a series on the spectra of long-period variables observed with a dis- persion of 10 A/mm. Tables 3 and 4 record data on the displacements of bright and dark lines which are more accurate than those previously available. Comparison of the displacements of the dark lines of various metals shows that most of the residuals are within errors of measurement. Certain of the larger residuals are probably related to the behavior of lines of various excitation levels rather than to differential motions of various atoms. In U On, for ex- ample, among Fe i lines the mean displacement at E.P. 1.6 volts is about 3 km/sec greater than at E.P. 0.0 volts. When the bright hydrogen lines are narrow, their displacements agree with those of other bright lines; when broad, they may have algebraically greater displacements. The In i line X 4511 may be emitted by fluorescence, the exciting line being Ho. Bright lines of Fe ii and T~ ii were observed inthe spectrumof R Aqi. Discussion is largely postponed until additional data for other variables become available Publication: The Astrophysical Journal Pub Date: November 1945 DOI: 10.1086/144763 Bibcode: 1945ApJ...102..347M full text sources ADS | Related Materials (1) Reprint: 1945CMWCI.713....1M
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