Chromospheric activity in H and K lines of Arcturus on 1984 February 14

Details Chromospheric activity in H and K lines of Arcturus on 1984 February 14 Chromospheric activity in H and K lines of Arcturus on 1984 February 14

Jun 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987cha%26a..11..146q&link_type=abstract

Chinese Astronomy and Astrophysics, Volume 11, Issue 2, p. 146-148.

Astronomy and Astrophysics

Astrophysics

1

Stars: Giant - Stellar Chroraospheric Activity

Scientific paper

We have obtained a large amount of high-dispersion spectra of Arcturus using our coude spectrograph attached to our 1-metre telescope. From this collection, we picked out an unbroken sequence of 5 spectra of the CaII H and K lines taken in a period of 4 hours on 1984 February 14. Their analysis shows that we were possibly witnessing a chromospheric eruption on the star. The following sequence was seen: the line profile became asymmetrical - the asymmetry remained while the peak emission increased - the profile became symmetrical once again. The largest asymmetry was 20% between the red and violet components of K2, and the maximum peak emission was some 20% above normal. There were also changes in K1. At the peak emission of K2 emission core appeared in the self-absorbed centre of K3.

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