Einstein detection of X-rays from the Alpha Centauri system

Details Einstein detection of X-rays from the Alpha Centauri system Einstein detection of X-rays from the Alpha Centauri system

Feb 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...253..242g&link_type=abstract

Astrophysical Journal, Part 1, vol. 253, Feb. 1, 1982, p. 242-247. Research supported by the Smithsonian Institution and Consig

Astronomy and Astrophysics

Astrophysics

44

Chromosphere, Coronal Loops, Late Stars, Main Sequence Stars, Stellar Radiation, X Ray Sources, Heao 2, K Stars, Proportional Counters, Spatial Resolution, Spectral Resolution, Stellar Models, Stellar Temperature

Scientific paper

Detection of quiescent X-ray emission from the stellar components of the Alpha Cen system: Alpha Cen A (G2 V) and Alpha Cen B (K1 V) is reported. Contrary to previous theoretical expectations, both stars are found to be X-ray emitters and at about the same level: Lx = 1.2 x 10 to the 27th and 2.8 x 10 to the 27th ergs/s for A and B, respectively; the sum of these values is in agreement with the emission level previously reported for Alpha Cen by Nugent and Garmire (1978). Comparison with previous chromospheric and transition region measurements suggests that Alpha Cen A and B may have changed in relative strength in recent years. The coronal temperature of the combined Cen AB source, which is dominated (approximately 2/3 of the total) by the K star is (2.1 + or - 0.4) x 10 to the 6th K, similar to that of the average solar corona; it is noted that this value is not consistent with the estimate of 5 x 10 to the 5th K quoted by Nugent and Garmire.

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