Hydrodynamical simulations of convection-related stellar micro-variability - II. The enigmatic granulation background of the CoRoT target HD 49933

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Volume 506 / No 1 (October IV 2009)

A&A, 506 1 (2009) 167-173

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The CoRoT space mission: early results

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Table 1:

CO⁵*BOLD* radiation-hydrodynamics model atmospheres.
Model	$T_{\rm eff}$	$\ensuremath{\log g}$	$\ensuremath{[{\rm Fe/H}]}$	$\ensuremath{R}$	$\ensuremath{l_{x}}$ , $\ensuremath{l_{y}}$	$\ensuremath{l_{z}}$	T	$\tau_{\rm c}$	$H_{{\rm p}}^{{\rm surf}}$	$\ensuremath{\delta I_{\rm rms}/I}$	$\ensuremath{{\ensuremath{\sigma_{{\rm gran}}}}}$	$N_{\rm obm}$	Modelcode
	[K]	[ ${\rm cm/s^2}$ ]		[ $\ensuremath{{R}_{\hbox{$\odot$ }}}$ ]	[Mm]	[Mm]	[ks]	[s]	[Mm]		[ppm]
S0	6 720	4.25	0.0	1.35	16.4	24.2	135.6	29.5	0.241	0.196	84 (17)	5	d3t68g43mm00n01
S1	6 730	4.25	-1.0	1.35	16.1	24.2	73.8	29.1	0.238	0.229	64 (13)	6	d3t68g43mm10n01
Sun1	5 780	4.44	0.0	1.00	5.6	2.5	52.2	17.8	0.141	0.172	40 (8)	5	d3gt57g44n53

``Model'' is the model's name used in this paper, $\ensuremath{T_{{\rm eff}}}$ the effective temperature, $\ensuremath{\log g}$ the gravitational acceleration, $\ensuremath{[{\rm Fe/H}]}$ the metallicity, $\ensuremath{R}$ an assumed stellar radius (not intrinsic to the simulation proper), $\ensuremath{l_{x}} =\ensuremath{l_{y}}$ the linear horizontal size of the square-shaped computational box, $\ensuremath{l_{z}}$ its vertical extent, T the duration of the simulated time series, $\ensuremath{\tau_{\rm c}}$ the sound crossing time over $\ensuremath{H_{\rm P}^{\rm surf}}$ , $\ensuremath{H_{\rm P}^{\rm surf}}$ the pressure scale height at Rosseland optical depth unity, $\ensuremath{\delta I_{\rm rms}/I}$ the relative spatial white light intensity contrast at disk-center, $\ensuremath{{\ensuremath{\sigma_{{\rm gran}}}}}$ the temporal relative disk-integrated granulation-related brightness fluctuations in white light (in parenthesis an estimate of the uncertainty), $N_{\rm obm}$ the number of equivalent frequency points considered in the solution of the radiative transfer equation, ``Modelcode'' an internal identifier of the model sequence.

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