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

[A VG]

Dear Richard and Earl,

thank you very much as well for your response and papers, Richard, I 
will read them both carefully. It's a topic a bit hard for me and I 
really appreciate the help of you both.

Best regards,

Antonio

On 13/10/21 22:34, RICHARD H D TOWNSEND wrote:
> For rapid rotation effects on visibility, see Townsend (1997, 
> https://ui.adsabs.harvard.edu/abs/1997MNRAS.284..839T 
> <https://ui.adsabs.harvard.edu/abs/1997MNRAS.284..839T>) and Townsend 
> (2003, https://ui.adsabs.harvard.edu/abs/2003MNRAS.343..125T 
> <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 
>> <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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