Autoionizing levels in SI II and identification of the 1400 A feature of Ap-Si stars

Details Autoionizing levels in SI II and identification of the 1400 A feature of Ap-Si stars Autoionizing levels in SI II and identification of the 1400 A feature of Ap-Si stars

Nov 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26a...168l...5a&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 168, no. 1-2, Nov. 1986, p. L5, L6.

Astronomy and Astrophysics

Astrophysics

13

A Stars, Autoionization, Peculiar Stars, Silicon, Spectrum Analysis, Ultraviolet Spectra, Absorption Spectra, Energy Levels, Stellar Spectrophotometry

Scientific paper

The author reports four new high energy levels of Si II belonging to the core-excited terms 3s3p(1P)3d2D0 and 2P0. They are determined from the classification of six laboratory UV emission lines. A broadening due to autoionization is detected for two of them. These results fix the energy of the strongly autoionizing 3s3p(1P)3d2F0 level of Si II, to about ±1000 cm-1, and lead to explain the broad 1400 Å absorption feature of Ap-Si stars as one strong transition toward this state. A synthetic calculation of this autoionizing line is compared with the IUE spectrum of the silicon star HD 34452.

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