GPU-accelerated X-ray pulse profile modeling | Astronomy & Astrophysics (A&A)

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Table 1

Unit vectors in the geometric setup.

Symbol	Description
$\hat{k}$ $Mathematical equation: ${\hat k}$$	Direction from the star center to the distant observer.
ȓ	Direction from the star center to the emitting surface patch.
$\hat{n}$ $Mathematical equation: $\hat n$$	Local surface normal at the emitting patch (coincides with ȓ for spherical stars).
${\hat{k}}_{0}$ $Mathematical equation: ${\hat k_0}$$	Initial photon direction at emission (before propagation).
$\hat{z}$ $Mathematical equation: ${\hat z}$$	Stellar rotation axis.
$\hat{β}$ $Mathematical equation: $\hat \beta$$	Local velocity direction of the emitting patch (tangent to the azimuthal circle).

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