Документ взят из кэша поисковой машины. Адрес оригинального документа : http://hea-www.harvard.edu/PINTofALE/pro/apedance.pro Дата изменения: Wed Apr 6 07:01:00 2005 Дата индексирования: Tue Oct 2 00:44:19 2012 Кодировка: Поисковые слова: trifid nebula

pro apedance,line,Z,abund=abund,apabref=apabref,verbose=verbose, _extra=e
;+
;procedure apedance
; remove or correct the abundance dependance of APED emissivities
;
; APED emissivities as stored on disk include both ion balance
; (Mazzotta et al.) and abundances (Anders & Grevesse). This
; can be inconvenient in some PINTofALE tasks since other line
; emissivity databases in PINTofALE do not include either factor.
; It is not possible to remove the effects of the included ion
; balance, but removing the abundance dependance is simply a
; matter of dividing the emissivity of each line by the abundance
; appropriate to the element producing that line.
;
;syntax
; apedance,line,Z,abund=abund,apabref=apabref,verbose=verbose
;
;parameters
; line [I/O] APED line emissivities
; * emissivity structure out of RD_LINE()
; * if 2D array, assumed to be an array of size (T,Wvl)
; Z [INPUT] atomic numbers
; * required if LINE is an array and not a structure
; * must match size of 2nd dimension in LINE
;
;keywords
; abund [INPUT] if given, updates LINE by multiplying by
; the ratio of ABUND/(Anders & Grevesse)
; * the default is to just divide by Anders & Grevesse
; abundances, effectively removing the abundance
; dependance from the emissivities
; apabref [INPUT] if set to a reference other than Anders & Grevesse,
; it is assumed that the input LINE emissivities need to be
; corrected according to the specified abundances.
; * WARNING: do not set this unless you know exactly
; what you are doing
; verbose [INPUT] controls chatter
; _extra [JUNK] here only to avoid crashing the program
;
;warning
; no checks are made to verify that the emissivities have
; have already had the abundances taken out, or that the
; abundances are corrected according to some other baseline.
; USE CAREFULLY!
;
;history
; vinay kashyap (Apr2004)
;-

; usage
ok='ok' & np=n_params() & nl=n_elements(line) & nZ=n_elements(Z)
nlt=n_tags(line) & szl=size(line)
if np eq 0 then ok='Insufficient parameters' else $
if nl eq 0 then ok='LINE is undefined' else $
if nlt ne 0 then begin ;(LINE is a structure
tagnames=tag_names(line)
i1=where(strupcase(tagnames) eq 'LINE_INT',mi1)
i2=where(strupcase(tagnames) eq 'Z',mi2)
if mi1 eq 0 or mi2 eq 0 then ok='structure in unknown format'
endif else begin ;structure)(array
nszl=n_elements(szl)
if np eq 1 then ok='Z is required' else $
if nZ eq 0 then ok='Z is undefined' else $
if szl[0] ne 2 then ok='LINE must be a 2D array of size (T,Wvl)' else $
if szl[2] ne nZ then ok='LINE and Z are incompatible'
endelse ;array)
if ok ne 'ok' then begin
print,'Usage: apedance,line,Z,abund=abund,apabref=apabref,verbose=verbose'
print,' remove or correct the abundance dependance of APED emissivities'
if np gt 0 then message,ok,/informational
return
endif

; inputs
vv=0L & if keyword_set(verbose) then vv=long(verbose[0])>1L
;
if keyword_set(apabref) then begin
if vv gt 0 then message,$
'Assuming input emissivities have abundances from '+$
apabref[0],/informational
apdefab=getabund(apabref[0])
endif
if n_elements(apdefab) lt 30 then begin
apdefab=getabund('anders & grevesse')
endif
;
abnd=0*apdefab+1. & if n_elements(abund) ge 30 then abnd=abund
;
if nlt ne 0 then begin
lemis=line.LINE_INT
lZ=long(line.Z)
endif else begin
lemis=line
lZ=long(Z)
endelse

; correct for abundance
fZ=abnd[lZ-1L]/apdefab[lZ-1L]
szl=size(lemis)
for iT=0L,szl[1]-1L do lemis[iT,*]=lemis[iT,*]*fZ[*]

; outputs
if nlt ne 0 then line.LINE_INT=lemis else line=lemis

return
end