Warm Coronal Rain on Young Solar Analog EK Draconis?

Details Warm Coronal Rain on Young Solar Analog EK Draconis? Warm Coronal Rain on Young Solar Analog EK Draconis?

Nov 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010apj...723l..38a&link_type=abstract

The Astrophysical Journal Letters, Volume 723, Issue 1, pp. L38-L43 (2010).

Astronomy and Astrophysics

Astronomy

1

Stars: Coronae, Stars: Individual: Hd 129333 Hd 128620, Ultraviolet: Stars

Scientific paper

We report a moderate-resolution, 1290-1430 Å spectrum of young solar analog EK Draconis (HD 129333: G1.5 V), obtained by Cosmic Origins Spectrograph on Hubble Space Telescope. The 20 minute observation, remarkably, captured two distinct "flares" in the Si IV 1400 Å doublet (T ~ 6 × 104 K); very broad profiles of Si IV and the C II 1335 Å multiplet (T ~ 3 × 104 K); and prominent Fe XXI λ1354 coronal forbidden line emission (T ~ 10 MK). The bright Si IV features are significantly redshifted compared to the milder, although still redshifted, equivalent components of solar-twin α1 Cen (HD 128620: G2 V). The broad, shifted, flaring hot-line profiles of EK Dra indicate not only that the subcoronal plasma of the young sun is highly dynamic, but also that the Si IV-bearing gas must be continually accreting onto the lower atmosphere, perhaps the stellar equivalent of warm "coronal rain."

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