PyFits issue

[Jiahui Huang]

Hi PyNeb developers,

I’m currently trying to use PyNeb to calculate H-alpha emissivity. But I got the following error:

pyneb.utils.logging.PyNebError: 'No TEMP field in h_i_rec_SH95.hdf5’

I don’t know whether it is related to pyfits, but it seems pyfits cannot be installed with Python 3.13.

Here’s the result I printed with print(pyneb.config.INSTALLED):

{'plt': True, 'scipy': True, 'mp': True, 'Chianti': False, 'Stout': False, 'pyfits from astropy': False, 'pyfits': False, 'h5py': True, 'astropy Table': False, 'cvxopt': False, 'ai4neb': False}

It seems pyneb cannot use pyfits from astropy even if I have astropy installed.

Do you have any ideas about how to solve this problem without downgrading python3?

Best,

Jiahui

[Christophe Morisset]

Hi Jiahui,

Could you try to run

import astropy

import astropy.io.fits as pyfits

from astropy.table import Table

from the same place you are trying to run pyneb?

Ch.

[黄佳辉]

Hi Christophe,

It looks like I'm lacking a package named bz2 so I cannot import astropy.io.fits. I'm trying to solve this. I will ask if I have further questions. Thank you!.

Jiahui

[黄佳辉]

Hi Chirstophe,

I'm trying to calculate the Halpha emission in high temperature cases (like >10^4 K). But I found that Halpha emissivity data is not available at this high temperature range in PyNeb. Is it possible to use PyNeb to calculate recombination lines in this temperature range?

[Jorge García Rojas]

Dear Jiahui,

in PyNeb, Halpha emissivities can be recovered until Te=30000 K interpolating from Storey & Hummer (1995) tables so, in principle, there should not be a problem to recover any value between 10^4 and 3x10^4 K.

cheers,

Jorge

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