Eta Carinae. II. The Spectrum.
1953; IOP Publishing; Volume: 118; Linguagem: Inglês
10.1086/145746
ISSN1538-4357
Autores Tópico(s)Classical Antiquity Studies
Resumoview Abstract Citations (87) References (10) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Eta Carinae. II. The Spectrum. Gaviola, E. Abstract Wave lengths and identifications in the spectrum of Carinae have been determined from 70 slit spectrograms obtained since January 9, 1944. The region 3255-7000 A is included; a slitless spectrogram extends the observed region toward the violet to 3029 A. A total of 903 emission lines and 76 absorption lines were measured, most of them on several plates. The intensities of the emission lines were determined with a semiquantitative objective scale. A small number of lines are almost perfectly sharp, while many are nebulous and very nebulous. Emission lines are multiple, showing two, three, and more components or satellites. They are unsymmetric. Ha is brighter, by a factor of several times, than the integrated remainder of the spectrum. Direct images obtained on panchromatic plates are thus monochromatic. An analysis of the Balmer series and a table of satellites are given. Ha shows components displaced about 1000 km/sec toward the violet and more than 1500 km/sec toward the red. The principal component is at +20 km/sec. Balmer absorption components vary in intensity and in relative position along the series. The true absorption spectrum studied by Cannon and Bok on the Harvard plates of 1892-1893 has been recorded. The emission spectrum covers it up partially; this suggests that the emission is produced by localixed eruptions which do not-or do not completely-disturb the star's atmosphere. Comparison with earlier photographs shows that the spectrum has not changed much in the present century. Some transitory changes were observed in 1948. The He I emission lines are of variable intensity. Publication: The Astrophysical Journal Pub Date: September 1953 DOI: 10.1086/145746 Bibcode: 1953ApJ...118..234G full text sources ADS | data products SIMBAD (1) Related Materials (1) Part 1: 1950ApJ...111..408G
Referência(s)