[Mesa-users] Inclination of the star rotation axis and the visibility of pulsation modes

[Earl Bellinger]

Dear Antonio,

I do not think GYRE does what you are after in these regards. The
inclination of the rotation axis affects the amplitudes of rotationally
split oscillation modes. However, GYRE is a linear code and can only
calculate the frequencies of the oscillation modes, and not their
amplitudes.

That being said, the effect of the inclination angle on mode visibility is
known analytically (e.g., Section 3.3 of [1], though I am not sure how well
this applies to rapid rotators). The raw mode amplitudes from a stellar
model will be unknown, but you may still be able to work out something with
that.

MESA can calculate gravity darkening, see MESA V [2].

[1] Kuszlewicz et al. 2018, MNRAS, https://arxiv.org/abs/1907.01565
[2] Paxton et al. 2019, ApJS, https://arxiv.org/abs/1903.01426

Best regards,
Earl

---
Earl Patrick Bellinger
Postdoctoral Research Fellow
Max Planck Institute for Astrophysics
https://earlbellinger.com


On Fri, Oct 8, 2021 at 11:06 PM A VG via Mesa-users <
mesa-users at lists.mesastar.org> wrote:

> Dear all,
>
> I am new in working with MESA, and I am trying to make it simulate
> oscillating stars which also have a high rotation velocity. My objective
> with the simulations is to compare them with experimental data, so I
> also need to take into account the inclination of the star rotation axis
> with its line of sight.
>
> Is there any option or tool in MESA to estimate the effect of the angle
> of observation in the pulsation modes visibilty? And also, does GYRE
> consider in its calculations the distribution of temperature and
> luminosity which are caused by the gravity darkening effect?
>
> I suppose GYRE takes that effect into account, but I wanted to confirm it.
>
> Best regards,
>
> Antonio Varo
>
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