[Mesa-users] question

Francis Timmes fxt44 at mac.com
Fri Jul 26 09:37:19 EDT 2019


also, appendix A of mesa IV offers additional info.
https://ui.adsabs.harvard.edu/abs/2018ApJS..234...34P/abstract

fxt




> On Jul 26, 2019, at 3:23 AM, Rob Farmer via Mesa-users <mesa-users at lists.mesastar.org> wrote:
> 
> Hi,
> 
> >how exactly does MESA/RSP compute the V/I band light curves  as per the history_columns.list
> 
> MESA computes the apparent magnitudes in private/history.f90 line ~ 1205-1248 (get_abs_mag_by_id and friends, and calls functions in the colors/ module) 
> 
> >and what is the difference between log_lum_bandV and log_lum_band bb_V? 
> 
> log_lum_band V is luminosity in the Johnson V band based on the bolometric corrections from Lejeune, Cuisinier, Buser (1998) which is based on stellar atmosphere models. These need Teff, log g and M/H at the photosphere
> log_lum_band bb_V is the V band luminosity of a blackbody, thus needs only the Teff at the photosphere.
> 
> Rob
> 
> 
> On Thu, 25 Jul 2019 at 23:33, Bill Paxton <paxton at kitp.ucsb.edu> wrote:
> Hi Rob,
> 
> Could you please provide some info for Shashi about the mesa colors module.
> 
> Thanks,
> Bill
> 
> 
> 
> > On Jul 25, 2019, at 2:04 PM, Shashi Kanbur <smkanbur at gmail.com> wrote:
> > 
> > Bill - how exactly does MESA/RSP compute the V/I band light curves  as per the history_columns.list - and what is the difference between log_lum_bandV and log_lum_band bb_V? Does it just compute the V band flux at the given temp. in the pulsation cycle from a black body curve? Does it use effective gravity also?
> > Thanks,
> > Shashi
> > 
> > !log_lum_band B
> >       !log_lum_band V
> >       !log_lum_band I
> >       
> >       !log_lum_band bb_U
> >       !log_lum_band bb_B
> >       !log_lum_band bb_V
> >       !log_lum_band bb_R
> >       !log_lum_band bb_I
> > 
> > -- 
> > Professor  and Chair,
> > Department of Physics,
> > SUNY Oswego,
> > Oswego, NY 13126
> > USA
> > 
> > "I know that I am mortal by nature, and ephemeral; but when I trace at my pleasure the windings to and fro of the heavenly bodies I no longer touch the earth with my feet: I stand in the presence of Zeus himself and take my fill of ambrosia”  - Ptolemy
> > 
> 
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