single exponential sfh

[drelkopi]

Hi,

I'm just wondering how do you set up SFH history with a single exponential only. 'sfhdelayed' doesn't seem to do the job. Even if I choose f_burst=0, there are still 2 populations produced - stellar.old and stellar.young - the sum of which is then my unattenuated stellar light curve. stellar.young component is not 0, which I assumed it should be given f_burst=0.

Any help would be greatly appreciated,

Mac

[mboquien]

Hello. The young/old indices are to separate the spectra compute the differential reddening. There is no incidence on the number of populations.

[drelkopi]

So, the SFH has only main stellar population when f_burst=0? There is no young burst? The SFH has only 1 exp component?

…

On 20 Dec 2023, at 13:46, Médéric Boquien ***@***.***> wrote: Hello. The young/old indices are to separate the spectra compute the differential reddening. There is no incidence on the number of populations. — Reply to this email directly, view it on GitHub <#75 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AOXMBRBTO26KQPFRDRKFOVLYKLM2XAVCNFSM6AAAAABA4XD3ZWVHI2DSMVQWIX3LMV43SRDJONRXK43TNFXW4Q3PNVWWK3TUHM3TSMBXHA3TC>. You are receiving this because you authored the thread.

[mboquien]

For sfhdelayed, it would be a delayed component (SFR∝exp(-t/τ)). If you want a pure exponential, the sfh2exp module with the f_burst parameter set to 0 would be more appropriate.

[drelkopi]

Isn't sfh2exp with f_burst=0 same as sfhdelayed with f_burst=0, given age_main and tau_main are the same in both cases?

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On 20 Dec 2023, at 13:52, Médéric Boquien ***@***.***> wrote: For sfhdelayed, it would be a delayed component (SFR∝exp(-t/τ)). If you want a pure exponential, the sfh2exp module with the f_burst parameter set to 0 would be more appropriate. — Reply to this email directly, view it on GitHub <#75 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AOXMBRHT66G5B537V74ZGZ3YKLNQBAVCNFSM6AAAAABA4XD3ZWVHI2DSMVQWIX3LMV43SRDJONRXK43TNFXW4Q3PNVWWK3TUHM3TSMBXHEZDS>. You are receiving this because you authored the thread.

[mboquien]

No, one is an exponential SFH, the other one a delayed SFH.