Astronomy and Astrophysics – Astrophysics
Scientific paper
2008-12-11
Astronomy and Astrophysics
Astrophysics
Cool Stars 15 Conference Proceeding, 4 pages
Scientific paper
10.1063/1.3099241
We present synthetic FeH band spectra in the z-filter range for several M-dwarf models with logg=3.0-5.0 [cgs] and Teff=2800K -3450K. Our aim is to characterize convective velocities in M-dwarfs and to give a rough estimate of the range in which 3D-atmosphere treatment is necessary and where 1D-atmosphere models suffice for the interpretation of molecular spectral features. This is also important in order to distinguish between the velocity-broadening and the rotational- or Zeeman-broadening. The synthetic spectra were calculated using 3D CO5BOLD radiative-hydrodynamic (RHD) models and the line synthesis code LINFOR3D. We used complete 3D-models and high resolution 3D spectral synthesis for the detailed study of some well isolated FeH lines. The FeH line strength shows a dependence on surface gravity and effective temperature and could be employed to measure both quantities in M-type objects. The line width is related to the velocity-field in the model stars, which depends strongly on surface gravity. Furthermore, we investigate the velocity-field in the 3D M-dwarf models together with the related micro- and macro-turbulent velocities in the 1D case. We also search for effects on the lineshapes.
Ludwig Hans Günter
Reiners Ansgar
Wende Sebastian
No associations
LandOfFree
Teff and logg dependence of FeH in M-dwarfs 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 Teff and logg dependence of FeH in M-dwarfs, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Teff and logg dependence of FeH in M-dwarfs will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-60792