HST/STIS High Resolution Echelle Spectra of alpha Centauri A (G2 V)

Details HST/STIS High Resolution Echelle Spectra of alpha Centauri A (G2 V) HST/STIS High Resolution Echelle Spectra of alpha Centauri A (G2 V)

2003-10-31

arxiv.org/abs/astro-ph/0310901v1

Astron.Astrophys. 415 (2004) 331-348

Astronomy and Astrophysics

Astrophysics

A&A in press

Scientific paper

10.1051/0004-6361:20034002

We describe and analyze HST/STIS observations of the G2 V star alpha Centauri A (alpha Cen A, HD 128620), a star similar to the Sun. The high resolution echelle spectra obtained with the E140H and E230H gratings cover the complete spectral range 1133-3150 Angstrom with a resolution of 2.6 km/s, an absolute flux calibration accurate to +/-5%, and an absolute wavelength accuracy of 0.6-1.3 km/s. We present here a study of the E140H spectrum covering the 1140-1670 Angstrom spectral range, which includes 671 emission lines representing 37 different ions and the molecules CO and H_2. For alpha Cen A and the quiet and active Sun, we intercompare the redshifts, nonthermal line widths, and parameters of two Gaussian representations of transition region lines (e.g., Si IV, C IV), infer the electron density from the O IV intersystem lines, and compare their differential emission measure distributions. One purpose of this study is to compare the alpha Cen A and solar UV spectra to determine how the atmosphere and heating processes in alpha Cen A differ from the Sun as a result of the small differences in gravity, age, and chemical composition of the two stars. A second purpose is to provide an excellent high resolution UV spectrum of a solar-like star that can serve as a proxy for the Sun observed as a point source when comparing other stars to the Sun.

Affiliated with

Also associated with

No associations

Rating

HST/STIS High Resolution Echelle Spectra of alpha Centauri A (G2 V) does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with HST/STIS High Resolution Echelle Spectra of alpha Centauri A (G2 V), we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and HST/STIS High Resolution Echelle Spectra of alpha Centauri A (G2 V) will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-634975