Mindice

In order to measure stellar absorptions, I have developed the mindice code. Written in python, it fits the stellar absorptions for any user-given spectrum with a single command-line.

For example, the code is shipped with an optical spectrum of NGC1052, and running the command:

from mindice import mindice

import numpy as np

spec = np.loadtxt('NGC1052.spec', unpack=True)

mindice(spec[0], spec[1], ind = 'Mgb', plot = True)

One can also run the code iteratively, for as many indexes as needed. For example, [MgFe]' can be calculated with:

indexes = ['Mgb', 'Fe5270', 'Fe5335']
EW = {}
for index in indexes:
    EW[index] = mindice(spec[0], spec[1], ind=index, plot=False)

MgFe = np.sqrt(EW['Mgb'] * (0.72*EW['Fe5270'] + 0.28*EW['Fe5335']))

The index definitions are in a file called mindice_defs.json, which contain all Lick/IDS (Worthey et al. 1994 ) optical indices, as well as the NIR absorptions from Eftekhari et al. (2021). The user can add their own definitions, as well as edit current ones. 

The code is open-source, and fully available at https://github.com/luisgdh/mindice.