normalized_star_spectrum#

arte.photometry.normalized_star_spectrum.from_file(filename)#

Get spectrum from file with up to 3 retries if download fails. Needed to overcome occasional network issues when downloading from STScI.

arte.photometry.normalized_star_spectrum.from_vega()#

Get Vega spectrum with up to 3 retries if download fails. Needed to overcome occasional network issues when downloading from STScI.

arte.photometry.normalized_star_spectrum.get_normalized_star_spectrum(spectral_type, magnitude, filter_name)#

Returns a structure containing the synthetic spectrum of the star having the spectral type and magnitude in the specified input filter. Magnitude is in VEGAMAG-F(lambda) system. Spectra are from PICKLES, PASP, 110, 863 (1998) Absolute flux spectra, no effect of atmospheric and instrument transmission

Parameters:

  • spectral_type (string.) – spectral type and luminosity class (e.g. G2V or M4III) or ‘vega’

  • magnitude (float.) – magnitude in the filter_name filter

  • filter_name (string.) – Name of the filter. See Filters.get() for the list of available filters

Returns:

spectrum

Return type:

synphot.SourceSpectrum object defining the spectrum

Examples

Plot the spectrum of a vega, A0V, G2V stars of mag=8 defined on JohnsonR filter

>>> sp= get_normalized_star_spectrum('vega', 8, Filters.JOHNSON_R)
>>> spA0V= get_normalized_star_spectrum('A0V', 8, Filters.JOHNSON_R)
>>> spG2V= get_normalized_star_spectrum('G2V', 8, Filters.JOHNSON_R)
>>> plt.plot(sp.waveset, sp(sp.waveset), label='Vega')
>>> plt.plot(spA0V.waveset, spA0V(spA0V.waveset), label='A0V')
>>> plt.plot(spG2V.waveset, spG2V(spG2V.waveset), label='G2V')
>>> plt.grid(True)
>>> plt.xlabel('nm')
>>> plt.ylabel('FLAM')
>>> plt.xlim(0, 10000)
>>> plt.legend()