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Re: mesa-users] Problem creating low Z stars and ZAMS models
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From: Alessandro P. <ale...@gm...> - 2010-11-03 11:28:58
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Hi Aaron, you are totally right, I just realized that I was using a 0.9 instead of 0.8 Msun... Sorry if I wasted your time and thanks for the answer. Everything is working perfectly ! A. On Wed, Nov 3, 2010 at 12:04 PM, Aaron Dotter <aar...@gm...>wrote: > Dear Ale, > > If you want a model with a main sequence lifetime of ~12 Gyr for Z=10^-4, I > recommend choosing M ~ 0.8 Msun. For 0.9 Msun, 7-8 Gyr is perfectly > reasonable. > > If you look at the MESA paper, we have an example of 0.8 Msun, Z=10^-4 > from four different codes and they all have MS lifetimes of ~12 Gyr (see > figure 19). > > Best wishes, > Aaron > > > > On Tue, Nov 2, 2010 at 6:35 PM, Alessandro Patruno <ale...@gm...>wrote: > >> Hi everyone, >> >> I was playing a bit with the test_suite >> "low_z" and "create_zams" but I found two problems >> I can't solve easily >> >> 1. How do I tell MESA to use a ZAMS model file that I created with >> "create_zams" instead of the default ones ? I just created a Z=0.0001 >> ZAMS sequence (for Population II stars) and I'd like to use it now to load >> >> initial stellar models... >> >> >> 2. I am creating a single star, a main sequence star of 0.9 Msun, >> with Z=0.0001. So I use "low_z" in the test_suite. >> My "inlist_low_z" has the lines: >> >> &star_job >> mesa_data_dir = '../../../data' ! for eos and opacity tables >> create_pre_main_sequence_model = .true. >> save_model_number=635 >> save_model_filename='0p9-z0001.dat' >> >> >> I start with a pre-main sequence model >> and then let the evolution go until the code tells >> me "starting main sequence". This happens at the 635-th time step >> (that's why I wrote save_model_number=635). >> I save the model in the file (0p9-z0001.dat), and I load it in the >> test_suite called "rlo" to do binary evolution. >> >> The inlist_test_rlo file has these lines n the &star_job section: >> >> &star_job >> >> mesa_data_dir = '../../../data' ! for eos and opacity tables >> log_columns_file = 'log_columns.list' >> >> load_saved_model=.true. >> saved_model_name='../low_z/0p9-z0001.dat' >> >> pgstar_flag = .true. >> >> >> I place the donor at a very large orbital separation (something like 10^10 >> days) >> to "simulate" a single star evolution before doing the real >> binary evolution later. >> However, the evolution is weird, the main sequence lasts for ~7.5 Gyr >> (instead of the expected 12 Gyr) >> and the evolution is very quick with the star becoming fully radiative >> at some point... >> >> Any idea what did I do wrong ?? >> >> Many thanks, I really appreciate your support ! >> >> Ale >> >> >> ------------------------------------------------------------------------------ >> Achieve Improved Network Security with IP and DNS Reputation. >> Defend against bad network traffic, including botnets, malware, >> phishing sites, and compromised hosts - saving your company time, >> money, and embarrassment. Learn More! >> http://p.sf.net/sfu/hpdev2dev-nov >> _______________________________________________ >> mesa-users mailing list >> mes...@li... >> https://lists.sourceforge.net/lists/listinfo/mesa-users >> >> > |
