SIMBAD references

1998A&A...329..229D - Astronomy and Astrophysics, volume 329, 229-232 (1998/1-1)

Chromospheric and coronal activity levels in the nearby faint M dwarf Gl 105B.


Abstract (from CDS):

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 Lx<26.1. High resolution optical data for CaII HK indicate a surface flux of ∼6.5x103erg/cm2/s, 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 2650K, 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 105erg/cm2/s.

Abstract Copyright:

Journal keyword(s): stars: individual: Gl 105B - activity - chromospheres - late-type

Status at CDS:  

Simbad objects: 2

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