Baraffe tables.

baraffe_tables is a small package to access the Baraffe (2003, 2015) evolutionary tables and enables interpolating between rows of the tables and between stellar ages (different tables). It was primarily created to calcualte the flux ratio of stellar companions given their mass.

How to use

To clone and install:

git clone https://github.com/jason-neal/baraffe_tables
cd baraffe_tables
python setup.py install

baraffe_table_search can be used to access a particular row of the Baraffe tables given a value of one parameter. For example, the parameters of a star with a mass of M/Ms=0.08 and an age=4.0 can be obtained using:

from baraffe_tables.table_search import baraffe_table_search
row = baraffe_table_search(column="M/Ms", value=0.08, age=4.0, model=2003, age_interp=True)
print(row)

The query_baraffe.py CLI script can also be used to achieve the same. Append -hfor help.

query_baraffe.py -h

Host-Companion flux ratio

There are also two scripts to use the Baraffe et al. 2003/2015 to estimate stellar companion parameters (primarily Brown Dwarfs (BD)) knowing their mass. These can be used for any companion within the Baraffe models mass range.

• mass_to_flux_ratio.py

  Takes a companion mass (in Mjup) and uses this to look up the absolute magnitude of the companion. This compares the magnitude of companion to the magnitude of the star in the literature (SIMBAD) to calculate the flux ratio. This also accounts for the conversion between apparent and absolute magnitudes.

• flux_ratio_to_mass.py

  This script works in reverse to mass_to_flux_ratio.py. Given a companion/host flux ratio what is the mass of the companion.

For example: HD30501 has a BD companion with a mass of 89 Mjup and an age of 5Gyr. The companion/host flux ratio an be estimated using the 2003 models with:

mass_to_flux_ratio.py HD30501 89 5 -m 03

Contributing

Any issues or suggestions? Everyone is welcome to make an issue or a pull request.