Re: [mesa-users] Rapidly Rotating A-Stars
Michel Rieutord <[email protected]>
| Newsgroups | gmane.comp.video.mesa3d.user |
|---|---|
| Message-ID | <[email protected]> |
Le 05/10/2013 14:18, Michel Rieutord a écrit : > Hi Jeremy, > > I think the best answer to your question is to be found with the ESTER > code that you can freely download at > http://code.google.com/p/ester-project/ > > This is a code that computes the 2D structure, including differential > rotation and meridional circulation, of rotating early-type stars at > any rotation rate (below critical of course). With this code you'll be > able to compare your data with those of the model including the > temperature dependence with latitude; by adjusting the hyrdogen content > of the core you may get an idea of the evolution status of your star on > the main sequence. This won't give you an age in years but this can > obtained with a 1D code afterwards. We are working out the time > evolution but this is not yet ready; this a tough problem all the more > that we need to also evolve the dynamics... > > You may find examples of the results in > Espinosa Lara & Rieutord 2013, A&A, 552, A35 > Rieutord & Espinosa Lara 2013, LNP 865, 49, Arxive 1208.4929 > or 2013arXiv:1310.0908 or arXiv:1310.1017 > > Don't hesitate if you have questions. > > Best wishes, > > Michel Rieutord > PS third attempt; hope this is the good one. > ************************************************************************** > Michel Rieutord > Institut de Recherche en Astrophysique et Planétologie > Observatoire Midi-Pyrénées email :[email protected] > 14 avenue Edouard Belin Tel +33 -(0)5 61 33 29 49 > 31400 Toulouse, France Fax +33 -(0)5 61 33 28 40 > ************************************************************************** > Le 04/10/2013 22:25, Jeremy Jones a écrit : >> Hey mesa users, >> >> I'm working on a project concerning interferometry of A-stars. Many >> of my targets are rapid rotators, and I'm looking into using mesa to >> determine their ages. I've played around with mesa a bit (I've >> included one of my inlists below). I have a question about how to >> compare my observables with the mesa outputs, in particular radius >> and temperature. >> >> From the modeling I do of the inerferometric data, I get the full >> radius profile of the star (i.e. radius as a function of latitude). >> Likewise, I get the full temperature profile of the star. >> >> My question is for a rapid rotator, which radius/temperature should I >> compare with the mesa outputs to get the age of the star? Polar >> radius/temperature, equatorial radius/temperature, something more >> involved? >> >> Thanks for any insight! >> >> ~Jeremy >> >> The aforementioned inlist: >> ================ >> &star_job >> >> mesa_dir = '../..' >> >> set_initial_age = .true. >> initial_age = 0 ! in years >> >> set_initial_model_number = .true. >> initial_model_number = 0 >> >> create_pre_main_sequence_model = .true. >> new_omega_div_omega_crit = 0.5 >> near_zams_relax_omega_div_omega_crit = .true. >> >> pgstar_flag = .true. >> >> >> / ! end of star_job namelist >> >> >> &controls >> >> min_timestep_limit = 1d-12 ! (seconds) >> >> ! check for retries and backups as part of test_suite >> ! you can delete this for use outside of test_suite >> max_number_backups = 400 >> max_number_retries = 900 >> max_model_number = 1500 >> >> !max_allowed_nz = 20000 ! maximum number of grid points allowed >> >> initial_mass = 2 >> initial_z = 0.016 >> >> photostep = 10 >> profile_interval = 10 >> history_interval = 1 >> terminal_interval = 2 >> write_header_frequency = 10 >> >> / ! end of controls namelist >> >> >> &pgstar >> >> History_Track1_win_flag = .true. >> History_Track1_yname = 'log_R' >> History_Track1_yaxis_label = 'log(R/R_sun)' >> History_Track1_xname = 'log_Teff' >> History_Track1_xaxis_label = 'log(T/K)' >> History_Track1_title = 'Radius vs. Effective Temperature' >> >> History_Track2_win_flag = .true. >> History_Track2_yname = 'surf_avg_v_rot' >> History_Track2_yaxis_label = 'Equatorial Velocity (km/s)' >> History_Track2_xname = 'star_age' >> History_Track2_xaxis_label = 'Age (yr)' >> History_Track2_title = 'Surface Velocity vs. Age' >> >> / ! end of pgstar namelist >> ================ >> >> -- >> Jeremy Jones >> Graduate Student Assistant >> Georgia State University >> Department of Physics & Astronomy >> [email protected] <mailto:[email protected]> >> >> >> ------------------------------------------------------------------------------ >> October Webinars: Code for Performance >> Free Intel webinars can help you accelerate application performance. >> Explore tips for MPI, OpenMP, advanced profiling, and more. Get the most from >> the latest Intel processors and coprocessors. See abstracts and register > >> http://pubads.g.doubleclick.net/gampad/clk?id=60134791&iu=/4140/ostg.clktrk >> >> >> _______________________________________________ >> mesa-users mailing list >> [email protected] >> https://lists.sourceforge.net/lists/listinfo/mesa-users > _______________________________________________ mesa-users mailing list [email protected] http://lists.freedesktop.org/mailman/listinfo/mesa-users