Helium Line Strengths in the Spectrum Variable a Centauri

Details Helium Line Strengths in the Spectrum Variable a Centauri Helium Line Strengths in the Spectrum Variable a Centauri

Sep 1968

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1968natur.219.1342n&link_type=abstract

Nature, Volume 219, Issue 5161, pp. 1342-1343 (1968).

Physics

17

Scientific paper

a CENTAURI (HD 125823) is a sharp lined B type star in which the neutral helium lines undergo a remarkable variation in strength. This was first noted by Bidelman1 and Thackeray2, and Jaschek and Jaschek3 have confirmed and further discussed the phenomenon. Jaschek and Jaschek described two spectra taken 17 nights apart in which the helium lines indicated spectral types B3 and B8 respectively. The present investigation shows that the strength of the He I line λ4471, for example, varies periodically between 300 and 2200 mÅ. All helium lines observed share similar extreme variations.

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