Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aas...193.2204m&link_type=abstract
American Astronomical Society, 193rd AAS Meeting, #22.04; Bulletin of the American Astronomical Society, Vol. 30, p.1283
Astronomy and Astrophysics
Astronomy
Scientific paper
To identify the basic physical processes that underlie stellar chromospheric activity, we have taken a novel theoretical approach and constructed first purely theoretical, two-component and time-dependent models of stellar chromospheres. Our models require specifying only four basic stellar parameters, namely, the effective temperature, gravity, metallicity and rotation rate, and they take into account non-magnetic and magnetic regions in stellar chromospheres. The non-magnetic regions are heated by acoustic waves generated by the turbulent convection in the stellar subphotospheric layers. The magnetic regions are identified with magnetic flux tubes uniformly distributed over the entire stellar surface and are heated by longitudinal tube waves generated by turbulent motions in the subphotospheric and photospheric layers. The coverage of stellar surface by magnetic regions (the so-called filling factor) is estimated for a given rotation rate from an observational relationship. The constructed models are based on the energy balance between the amount of mechanical energy supplied by waves and radiative losses in strong Ca II and Mg II emission lines. We have already used our chromospheric models to predict the level of ``basal flux'' and the decrease of chromospheric activity with stellar rotation in selected late-type dwarfs. We present these new results and discuss how to include stellar transition regions, coronae and winds in our models.
Cuntz Manfred
Musielak Zdzislaw E.
Ulmschneider Peter
No associations
LandOfFree
Theoretical Models of Stellar Chromospheres does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Theoretical Models of Stellar Chromospheres, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Theoretical Models of Stellar Chromospheres will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-993102