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Doppler beaming factors for white dwarfs, main sequence stars, and giant stars Limb-darkening coefficients for 3D (DA and DB) white dwarf models

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arxiv 2007.15715 v1 pith:SU4UWYHG submitted 2020-07-30 astro-ph.SR

Doppler beaming factors for white dwarfs, main sequence stars, and giant stars Limb-darkening coefficients for 3D (DA and DB) white dwarf models

classification astro-ph.SR
keywords modelsbeamingfactorslimb-darkeningstarswhiteaccurateblack
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We computed Doppler beaming factors for DA, DB, and DBA white dwarf models, as well as for main sequence and giant stars covering the transmission curves of the Sloan, UBVRI, HiPERCAM, Kepler, TESS, and Gaia photometric systems. The calculations of the limb-darkening coefficients for 3D models were carried out using the least-squares method for these photometric systems. The beaming factor calculations, which use realistic models of stellar atmospheres, show that the black body approximation is not accurate, particularly for the filters $u$, $u'$, $U$, $g$, $g'$, and $B$. The black body approach is only valid for high effective temperatures and/or long effective wavelengths. Therefore, for more accurate analyses of light curves, we recommend the use of the beaming factors presented in this paper. Concerning limb-darkening, the distribution of specific intensities for 3D models indicates that, in general, these models are less bright toward the limb than their 1D counterparts, which implies steeper profiles. To describe these intensities better, we recommend the use of the four-term law (also for 1D models) given the level of precision that is being achieved with Earth-based instruments and space missions such as Kepler and TESS (and PLATO in the future).

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Cited by 1 Pith paper

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  1. Physics of Eclipsing Binaries. VI. Hot, compact stars

    astro-ph.SR 2026-07 accept novelty 5.0

    PHOEBE 2.5 incorporates TMAP and Tremblay atmospheres, atmosphere blending, and derived limb-darkening tables to model hot compact stars in eclipsing binaries without blackbody fallback.