[Mesa-users] question

[Rob Farmer]

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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