ATLAS9

ATLAS9YBCGrid(grid::AbstractString)

Load and return the YBC ATLAS9 bolometric corrections for the given photometric system grid, which must be a valid entry in BolometricCorrections.YBC.systems. This type is used to create instances of ATLAS9YBCTable that have fixed dependent grid variables ([M/H], Av). This can be done either by calling an instance of ATLAS9YBCGrid with (mh, Av) arguments or by using the appropriate constructor for ATLAS9YBCTable.

julia> grid = ATLAS9YBCGrid("acs_wfc")
YBC ATLAS9 bolometric correction grid for photometric system YBC/acs_wfc.

julia> grid(-1.01, 0.11) # Can be called to construct table with interpolated [M/H], Av
YBC ATLAS9 bolometric correction table for system YBC/acs_wfc with [M/H] -1.01 and V-band extinction 0.11

ATLAS9YBCTable(grid::ATLAS9YBCGrid, mh::Real, Av::Real)

Interpolates the YBC ATLAS9 bolometric corrections in grid to a fixed value of [M/H] (mh) and V-band extinction (Av), leaving only Teff and logg as dependent variables (the YBC ATLAS9 BCs have only one Rv value). Returns an instance that is callable with arguments (Teff [K], logg [cgs]) to interpolate the bolometric corrections as a function of temperature and surface gravity.

ATLAS9YBCTable(grid::AbstractString, mh::Real, Av::Real)

Loads the data necessary to construct the BC table for the provided grid (e.g., "acs_wfc") at [M/H] = mh and V-band extinction Av. This method does not support interpolation in metallicity or extinction, so the arguments mh and Av must be among the values provided by ATLAS9 (see BolometricCorrections.YBC.ATLAS9.gridinfo.MH).

julia> grid = ATLAS9YBCGrid("acs_wfc")
YBC ATLAS9 bolometric correction grid for photometric system YBC/acs_wfc.

julia> table = ATLAS9YBCTable(grid, -1.01, 0.011) # Interpolate table from full grid
YBC ATLAS9 bolometric correction table for system YBC/acs_wfc with [M/H] -1.01 and V-band extinction 0.011

julia> length(table(4025, 0.01)) == 12 # Returns BC in each filter
true

julia> size(table([4025, 4225], [0.01, 0.02])) # `table(array, array)` is also supported
(12, 2)

julia> using TypedTables: Table # `table(Table, array, array)` will return result as a Table

julia> table(Table, [4025, 4225], [0.01, 0.02]) isa Table
true

julia> ATLAS9YBCTable("acs_wfc", -2.0, 0.5) isa ATLAS9YBCTable # Can construct without a ATLAS9YBCGrid
true

ATLAS9Chemistry()

Returns a singleton struct representing the ATLAS9 chemical mixture model. ATLAS9 assumes the Grevesse and Sauval (1998) solar abundances for which photospheric abundances are equal to protostellar abundances – this is what they mean when they write "the effects of element migration at the bottom of the convective zone ... are not observed." In ATLAS9, the helium abundance is not scaled with the metallicity, so only the hydrogen mass fraction and metal mass fraction change as a function of metal abundance (i.e., dY/dZ = 0). See also Girardi et al. (2007).

julia> using BolometricCorrections.YBC.ATLAS9: ATLAS9Chemistry, X, Y, Z, X_phot, Y_phot, Z_phot, MH;

julia> chem = ATLAS9Chemistry();

julia> X(chem) + Y(chem) + Z(chem) ≈ 1 # solar protostellar values
true

julia> X_phot(chem) + Y_phot(chem) + Z_phot(chem) ≈ 1 # solar photospheric values
true

julia> X(chem) == X_phot(chem) # photospheric and protostellar abundances equal (assume no diffusion)
true

julia> MH(chem, Z(chem) * 0.1) ≈ -1.00894760736597
true

julia> Z(chem, -1.00894760736597) ≈ Z(chem) * 0.1
true