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The Sun as a Star: Comparing Alpha Cen A to UV Solar Spectra

Published online by Cambridge University Press:  26 May 2016

Jeffrey L. Linsky ,
Isabella Pagano ,
Jeff A. Valenti  and
Doug Duncan
Jeffrey L. Linsky
Affiliation:
JILA/University of Colorado and NIST, Boulder, CO, USA
Isabella Pagano
Affiliation:
Catania Astrophysical Observatory, Catania, Italy
Jeff A. Valenti
Affiliation:
Space Telescope Science Institute, Baltimore, MD, USA
Doug Duncan
Affiliation:
Dept. of Astrophysical and Planetary Sciences, University of Colorado, Boulder, CO, USA

Abstract

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The Space Telescope Imaging Spectrograph (STIS) obtained high resolution echelle spectra of the nearby G2 V star α Centauri A covering the entire 1133—3150 Â region with very high signal/noise. This data set provides what is probably 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—1 resolution, accurate absolute fluxes, full UV spectral coverage, high S/N, and low scattered light. In the 1140—1670 Â region we identify 671 emission lines from 37 different atoms and ions and the molecules CO and H2. We make a detailed comparison of the solar and α Cen A spectra in terms of line identification, line widths and Doppler shifts, emission measure distributions, and electron densities.

Type
Part 8: Stellar Analogues for Interaction and Evolution
Information
Symposium - International Astronomical Union , Volume 219: Stars as Suns : Activity, Evolution and Planets , 2004 , pp. 431 - 436
Copyright
Copyright © Astronomical Society of the Pacific 2004 

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