Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004iaus..219..431l&link_type=abstract
Stars as suns : activity, evolution and planets, Proceedings of the 219th symposium of the International Astronomical Union held
Astronomy and Astrophysics
Astronomy
Scientific paper
The Space Telescope Imaging Spectrograph (STIS) obtained high resolution echelle spectra of the nearby G2 V star Alpha Centauri A covering the entire 1133-3150 Angstrom region with very high signal/noise. This data set provides what is likely the best approximation to the spectrum of the Sun viewed as a star because it is a full disk spectrum with 2.6 km/s resolution accurate absolute fluxs full UV spectral coverage high S/N and low scattered light. In the 1140-1670 Angstrom region we identify 671 emission lines from 27 different atoms and ions and molecular hydrogen. We make a detailed comparison of the solar and Alpha Cen A spectra in terms of line identification line widths and Doppler shifts emission measure distribution and electron densities. Although the two stars are very similar we do identify differences that could be ascribed to slight differences in gravity age and chemical composition of the two stars.
Duncan Douglas
Linsky Jeffrey L.
Pagano Isabella
Valenti Jeff A.
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