2004A&A...415..331P


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.16CEST06:30:07

2004A&A...415..331P - Astronomy and Astrophysics, volume 415, 331-348 (2004/2-3)

HST/STIS high resolution echelle spectra of * alf Cen A.

PAGANO I., LINSKY J.L., VALENTI J. and DUNCAN D.K.

Abstract (from CDS):

We describe and analyze HST/STIS observations of the G2 V star α Centauri A (α 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 1133-3150Å with a resolution of 2.6km/s, an absolute flux calibration accurate to ±5%, and an absolute wavelength accuracy of 0.6-1.3km/s. We present here a study of the E140H spectrum covering the 1140-1670Å spectral range, which includes 671 emission lines representing 37 different ions and the molecules CO and H2. For α 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., SiIV, CIV), infer the electron density from the OIV intersystem lines, and compare their differential emission measure distributions. One purpose of this study is to compare the α Cen A and solar UV spectra to determine how the atmosphere and heating processes in α 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.

Abstract Copyright:

Journal keyword(s): stars: individual: α Cen A - stars: chromospheres

VizieR on-line data: <Available at CDS (J/A+A/415/331): table4.dat>

Simbad objects: 14

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Number of rows : 14

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 * bet Cet PM* 00 43 35.37090 -17 59 11.7827 3.90 3.02 2.01 1.29 0.78 G9.5IIICH-1 499 0
2 HD 22468 RS* 03 36 47.2911034958 +00 35 15.938962144 7.09 6.63   5.4   K2:Vnk 1124 0
3 * alf Aur SB* 05 16 41.35871 +45 59 52.7693 1.33 0.88 0.08 -0.52 -0.96 G3III: 1137 0
4 V* AB Dor TT* 05 28 44.8916324761 -65 26 55.289846904 8.259 7.856 6.999 6.496 5.993 K0V 931 0
5 * alf CMi SB* 07 39 18.11950 +05 13 29.9552 0.82 0.79 0.37 -0.05 -0.28 F5IV-V+DQZ 1758 0
6 * bet Gem PM* 07 45 18.94987 +28 01 34.3160 3.00 2.14 1.14 0.39 -0.11 K0IIIb 1046 1
7 * 31 Com Ro* 12 51 41.9190038520 +27 32 26.568320838 5.81 5.61 4.94 4.39 4.04 G0IIIp 411 1
8 V* V645 Cen Er* 14 29 42.9451234609 -62 40 46.170818907 14.21 12.95 11.13 9.45 7.41 M5.5Ve 958 0
9 * alf Cen ** 14 39 29.71993 -60 49 55.9990   0.4 -0.1     G2V+K1V 817 0
10 * alf Cen B PM* 14 39 35.06311 -60 50 15.0992 2.89 2.21 1.33     K1V 895 1
11 * alf Cen A SB* 14 39 36.49400 -60 50 02.3737 0.96 0.72 0.01     G2V 1138 0
12 * 18 Sco PM* 16 15 37.2703721200 -08 22 09.981989277   6.15 5.50     G2Va 484 0
13 * bet Dra * 17 30 25.9616959 +52 18 04.999351 4.43 3.79 2.81 2.12 1.64 G2Ib-IIa 393 0
14 V* AU Mic BY* 20 45 09.5323695486 -31 20 27.241710746   10.05 8.627 9.078 6.593 M1VeBa1 893 0

    Equat.    Gal    SGal    Ecl

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2020.07.16-06:30:07

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