Modules for basic operations on LAMOST spectra, etc.

Bo Zhang, bozhang@nao.cas.cn

• https://github.com/hypergravity/laspec
• https://pypi.org/project/laspec/

• for the latest stable version: pip install -U laspec
• for the latest github version: pip install -U git+git://github.com/hypergravity/laspec

• binning
  module for rebinning spectra
  • rebin(wave, flux, flux_err, mask): rebin spectra
• ccf
  module for cross correlation function
  • xcorr_rvgrid: cross-correlation given an RV grid
  • xcorr: standard cross-correlation
  • sine_bell: a sine bell function
• convolution
  module for spectral Gaussian convolution
  • conv_spec: capable to tackle arbitrary R_hi and R_lo but relatively slow
• interpolation
  interpolation, but slow, please do not use.
  • Interp1q: use numpy.interp instead
• lamost
  module for LAMOST spectra and files
  • lamost_filepath(planid, mjd, spid, fiberid)
  • lamost_filepath_med(planid, mjd, spid, fiberid)
  • sdss_filepath(plate, mjd, fiberid)
• line_indices
  module to measure spectral line index (EW)
  • measure_line_index: measure line index (EW)
• normalization
  module to normalize spectra
  • normalize_spectrum: a Python version of Chao's method
  • normalize_spectrum_iter: iterative normalization (recommended)
• qconv
  quick convolution, designed for two cases:
  • conv_spec_Gaussian(wave, flux, R_hi=3e5, R_lo=2000): scalar resolution to scalar resolution instrumental broadening
  • conv_spec_Rotation(wave, flux, vsini=100., epsilon=0.6): stellar rotation broadening
• read_spectrum
  module to read LAMOST/SDSS spectra
  • read_spectrum(fp): read LAMOST low-res spectra
  • read_lamostms(fp): read LAMOST medium-res spcetra
• spec
  modules for operations on general spectra (deprecated)
  • Spec: spec class
• wavelength
  module to convert wavelength between air and vacuum
  • wave_log10: log10 wavelength grid
  • vac2air: convert wavelength from vacuum to air
  • air2vac: convert wavelength from air to vacuum

...