Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998a%26a...329..229d&link_type=abstract
Astronomy and Astrophysics, v.329, p.229-232 (1998)
Astronomy and Astrophysics
Astrophysics
3
Stars: Gl 105B, Activity, Chromospheres, Late-Type
Scientific paper
Monitoring with the HRI onboard ROSAT failed to detect the nearby faint M dwarf star Gl 105B (a star of anomalously low chromospheric and coronal activity), implying log L_x < 26.1. High resolution optical data for Caii HK indicate a surface flux of ~ 6.5 \ 10(3) \ erg \ cm(-2) \ s(-1) , in good agreement with the previously measured Mg ii hk flux. Based on chromospheric modelling, both the Hα and Caii K line profiles indicate an atmospheric structure which is intermediate between that of an intermediate dM chromosphere and a basal chromosphere. Also, the modelling indicates that a better fit is obtained using a model atmosphere which has Tmin less than 2650 K, and a thin, steep chromosphere. Furthermore, the Caii HK radiative losses may only be ~ 5% of the radiative losses in the UV continuum, implying total chromospheric losses in excess of 10(5) erg cm(-2) s(-1) .
Amado Pedro J.
Byrne Brendan P.
Doyle Gerry J.
Short Christopher Ian
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