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

[A VG]

Dear Earl,

thank you very much for your response. I will look carefully the papers 
you referenced in your email to see what I can do.

Best regards,

Antonio

On 13/10/21 21:54, Earl Bellinger wrote:
> 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 
> <https://arxiv.org/abs/1907.01565>
> [2] Paxton et al. 2019, ApJS, https://arxiv.org/abs/1903.01426 
> <https://arxiv.org/abs/1903.01426>
>
> Best regards,
> Earl
>
> ---
> Earl Patrick Bellinger
> Postdoctoral Research Fellow
> Max Planck Institute for Astrophysics
> https://earlbellinger.com <https://earlbellinger.com/>
>
>
> On Fri, Oct 8, 2021 at 11:06 PM A VG via Mesa-users 
> <mesa-users at lists.mesastar.org <mailto: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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