[Mesa-users] Setting H-envelope mass in subdwarfs

Evan Bauer evan.bauer.astro at gmail.com
Wed Aug 10 00:02:08 UTC 2022

Hi Kunal,

> I used the make_sdb test which uses 1M_pre_ms_to_WD and results in an sdB mass of about 0.47 Msun. To obtain higher mass sdBs (say 0.55 Msun), we need to start with higher pre-MS masses (upwards of 3 Msun). What is the correct way to go about this?
> The simplest way I could think of was changing initial mass in 1M_pre_ms_to_WD from 1 Msun to 3 Msun. The numerous parameters in the inlist however have been set for 1 Msun. Is there any prescribed way to form high mass sdBs or will I have to change all the parameters according to the initial mass for every case?

The parameter intial_mass is the one that controls the starting mass of the model. For the higher-mass models needed to make a 0.55 Msun subdwarf, the models won't go through the He core flash, so the modeling is simpler and you won't need all of the steps from the 1M_pre_ms_to_WD setup.

> Finally, on a related note, how do we run a subset of parts in tests that have multiple parts? (ex. run 1M_pre_ms_to_WD only till the to_end_core_he_burn part)

You can edit the "rn" bash script to comment out the parts of the run that you want to do. For example, in the 1M_pre_ms_to_WD case, you could use the # character in this script to comment out these lines:

	do_one inlist_to_end_core_he_burn_header end_core_he_burn.mod LOGS_to_end_core_he_burn
	do_one inlist_to_end_agb_header end_agb.mod LOGS_to_end_agb 
	do_one inlist_to_wd_header final.mod LOGS_to_wd

When commented out, those stages of the run will be skipped.

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