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

[RICHARD H D TOWNSEND]

For rapid rotation effects on visibility, see Townsend (1997, https://ui.adsabs.harvard.edu/abs/1997MNRAS.284..839T) and Townsend (2003, https://ui.adsabs.harvard.edu/abs/2003MNRAS.343..125T)

On Oct 13, 2021, at 2:54 PM, mesa-users at lists.mesastar.org 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
[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<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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