Other
Scientific paper
Sep 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aspc..332..159h&link_type=abstract
The Fate of the Most Massive Stars, ASP Conference Series, Vol. 332, Proceedings of the conference held 23-28 May, 2004 in Grand
Other
5
Scientific paper
The Harvard objective prism spectra of η Car cover the period from 1892 to 1941. The famous spectra from 1892 and 1893 were the first recorded spectra of η Car and are especially significant because they caught the star during its second or lesser eruption when it had the spectrum of an F -- type supergiant.
Visual inspection and digitized scans of the spectra from 1892 to ˜ 1920 confirm the conclusion by Feast, Whitelock and Marang(2001) that there were no high excitation lines, specifically He I λ 4471, in the spectrum during this time. The Harvard plates have very good coverage from 1922 to 1926 and from 1937 to 1941. Our visual inspection combined with measurements of the digitized scans, show no evidence of high excitation lines Figure 1 shows one of the best spectra and the region where He I 4471 is expected. A line at λ 4474 is easily misidentified with He I, but is a blend of Fe II and [Fe II] lines. Feast, Whitelock and Marang(2001) made the same identification.
Thus, the star's spectrum was always in the low excitation state from 1892 to 1941. There is no spectroscopic evidence for the presence of the He I line or other high excitation emission lines in the spectra until Gaviola(1953) obtained his first spectra (1944- 1951) showing He I emission, and no 5.5 year cycle as we understand it today.
Humphreys Roberta M.
Koppelman Michael
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