Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...174..187g&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 174, no. 1-2, March 1987, p. 187-196.
Astronomy and Astrophysics
Astrophysics
14
Chromosphere, Exosat Satellite, Giant Stars, Late Stars, Stellar Coronas, X Ray Sources, Carbon, Iue, Magnesium, Silicon, Stellar Rotation, Stellar Temperature
Scientific paper
The authors report new X-ray detections of HD 1671 (F5 III) and HD 12929 (K2 III). From an analysis of X-ray count rates in three broadband filters from HD 203387, they derive an estimate of its coronal temperature of T ≡ 3×106K. The data show that HD 12929 (K2 III) differs from the earlier type stars which the authors observed in the following respect: its chromospheric radiative losses and X-ray flux are one and two orders of magnitude lower, respectively, than those of the other giants observed and no Si IV and C IV emission is visible in its low resolution IUE spectrum. From their observations and previous X-ray flux measurements, the authors confirm that no simple correlation between X-ray flux and rotational rate alone can be expected for late-type giants beyond spectral type G5 III. It is speculated that convection might play a role in the change of the structure of the outer atmosphere of K giants.
Gondoin Ph.
Mangeney Andre
Praderie Francoise
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