StarData

class measure_extinction.stardata.StarData(datfile, path='', photonly=False, use_corfac=True, deredden=False)

Bases: object

Photometric and spectroscopic data for a star

Attributes:

filestring

DAT filename

pathstring

DAT filename path

sptypestring

spectral type of star

model_paramsdict

has the stellar atmosphere model parameters empty dict if observed data

datadict of key:BandData or SpecData

key gives the type of data (e.g., BAND, IUE, IRS)

photonly: boolean

Only read in the photometry (no spectroscopy)

corfacdict of key:correction factors

key gives the type (e.g., IRS, IRS_slope)

use_corfacboolean

whether or not to use the correction factors, default = True

LXD_manboolean

whether or not the LXD scaling factor has been set manually, default = False

Parameters:

datfile: string

filename of the DAT file

path: string, optional

DAT file path

photonly: boolean

Only read in the photometry (no spectroscopy)

use_corfac: boolean

Modify the spectra based on precomputed correction factors Currently only affects Spitzer/IRS data and SpeX data

dereddenboolean [default=False]

Deredden the data based on dereddening parameters given in the DAT file. Generally used to deredden standards.

Methods Summary

deredden()	Remove the effects of extinction from all the data.
get_flat_data_arrays(req_datasources)	Get the data in a simple format
plot(ax[, pcolor, norm_wave_range, mlam4, ...])	Plot all the data for a star (bands and spectra)
read([deredden])	Populate the object from a DAT file + spectral files

Methods Documentation

deredden()

Remove the effects of extinction from all the data. Prime use to deredden a standard star for a small amount of extinction. Information on the extinction curve to use is given in the DAT_file. Uses FM90 parameters for the UV portion of the extinction curve and CCM89 extinction values for the optical/NIR based on R(V). A(V) values used for dust column.

get_flat_data_arrays(req_datasources)

Get the data in a simple format

Parameters:

req_datasourceslist of str

list of data sources (e.g., [‘IUE’, ‘BAND’])

Returns:

(waves, fluxes, uncs)tuple of numpy.ndarrays

arrays are sorted from short to long wavelengths waves is wavelengths in microns fluxes is fluxes in erg/cm2/s/A uncs is uncertainties on flux in erg/cm2/s/A

plot(ax, pcolor=None, norm_wave_range=None, mlam4=False, wavenum=False, fluxunit=Unit('erg / (Angstrom s cm2)'), exclude=[], yoffset=None, yoffset_type='multiply', annotate_key=None, annotate_wave_range=None, annotate_alignment='left', annotate_text=None, annotate_rotation=0.0, annotate_yoffset=0.0, annotate_color='k', legend_key=None, legend_label=None, fontsize=None)

Plot all the data for a star (bands and spectra)

Parameters:

axmatplotlib plot object

pcolormatplotlib color [default=None]

color to use for all the data

norm_wave_rangelist of 2 floats [default=None]

min/max wavelength range to use to normalize data

mlam4boolean [default=False]

plot the data multiplied by lambda^4 to remove the Rayleigh-Jeans slope

wavenumboolean [default=False]

plot x axis as 1/wavelength as is standard for UV extinction curves

fluxunitastropy unit

flux units for plot, default is ergs/(cm^2 s A)

excludelist of strings [default=[]]

List of data type(s) to exclude from the plot (e.g., “IRS”, “IRAC1”,…)

yoffsetfloat [default=None]

multiplicative or additive offset for the data

yoffset_typestr [default=”multiply”]

yoffset type: “multiply” or “add”

annotate_keystring [default=None]

type of data for which to annotate text (e.g., SpeX_LXD)

annotate_wave_rangelist of 2 floats [default=None]

min/max wavelength range for the annotation of the text

annotate_alignmentstring [default=”left”]

horizontal alignment of the annotated text (“left”, “center”, “right”)

annotate_textstring [default=None]

text to annotate

annotate_rotationfloat [default=0.0]

rotation angle of the annotated text

annotate_yoffsetfloat [default=0.0]

y-offset for the annotated text

annotate_colorstring [default=”k”]

color of the annotated text

legend_keystring [default=None]

legend the spectrum using the given data key

legend_labelstring [default=None]

label to use for legend

fontsizeint [default=None]

fontsize for plot

read(deredden=False)

Populate the object from a DAT file + spectral files

Parameters:

dereddenboolean [default=False]

Deredden the data based on dereddening parameters given in the DAT file. Generally used to deredden standards.