README file

Reference paper:
----------------

Origlia L., Leitherer C., 
'Transformations between the theoretical and observational 
planes in the HST-NICMOS and WFPC2 photometric systems'
1999, AJ, submitted

Color-temperature relations and bolometric corrections in the 
HST-NICMOS F1110W, F160W and F222M and in the WFPC2 F439W, F555W and F814W 
photometric systems have been derived.
We also computed colors and BC in the the ground-based BVIJHK Johnson's 
(1966) photometric system (see also Sect.~5 in Leitherer \& Heckman 1995 
for more details).
The behavior of the inferred quantities with varying the stellar parameters, 
the adopted model atmospheres and the instrumental configurations are
discussed in the paper.

The synthetic colors and BC were computed using a modified version of the 
evolutionary synthesis code by Leitherer et al. (1999) and adopting two 
different sets of model atmospheres:

- the compilation by Lejeune, Cuisinier \& Buser (1997, hereafter LCB97),
  based on the ATLAS code by Kurucz and corrected to match empirical 
  color-temperature calibrations
- the compilation by Bessell, Castelli \& Plez (1998, hereafter BCP98), 
  using only the homogeneous set of models without overshooting computed 
  by Castelli (1997) and based on Kurucz's ATLAS9 models.

The grid of stellar parameters explored by our computations is:

- Metallicities in the range 0.01 - 1.00 solar
- Effective temperatures T_eff in the range 3500 - 50000 K
- Gravities logg in the range 0.0 - 5.0 

The colors have been normalized assuming 0.00 values in all passbands 
for a Vega-like star with T_eff=9500K, logg=4.0 and [Fe/H]=-0.5. 
The BC have been normalized assuming a value of -0.07 for a Sun-like star 
with T_eff=5750K, logg=4.5 and [Fe/H]=0.0.

For each model atmosphere at a given T_eff and logg we tabulate the 
corresponding colors in the form (V-F), where F is the selected filter 
in the ground-based or in the HST system, and the bolometric correction 
BCV in the V passband.
We also provided analogous colors and BC using simple blackbodies at a 
given temperature. 

files:
------
wfpc2_BCP98p00.color  ==> atmosphere: BCP98 [Fe/H]=+0.0
wfpc2_BCP98m05.color  ==> atmosphere: BCP98 [Fe/H]=-0.5 
wfpc2_BCP98m10.color  ==> atmosphere: BCP98 [Fe/H]=-1.0
wfpc2_BCP98m15.color  ==> atmosphere: BCP98 [Fe/H]=-1.5
wfpc2_BCP98m20.color  ==> atmosphere: BCP98 [Fe/H]=-2.0
wfpc2_LCB97p00.color  ==> atmosphere: LCB97 [Fe/H]=+0.0
wfpc2_LCB97m05.color  ==> atmosphere: LCB97 [Fe/H]=-0.5
wfpc2_LCB97m10.color  ==> atmosphere: LCB97 [Fe/H]=-1.0
wfpc2_LCB97m15.color  ==> atmosphere: LCB97 [Fe/H]=-1.5
wfpc2_LCB97m20.color  ==> atmosphere: LCB97 [Fe/H]=-2.0

format: (1x,i5,1x,f4.1,1x,2f7.3,1x,4(1x,3(f7.3)),1x,f7.3)

column #1: T_eff
column #2: logg
column #3: V-B
column #4: V-I
column #5: V-F439W PC1
column #6: V-F555W PC1
column #7: V-F814W PC1
column #8: V-F439W WF2
column #9: V-F555W WF2
column #10: V-F814W WF2
column #11: V-F439W WF3
column #12: V-F555W WF3
column #13: V-F814W WF3
column #14: V-F439W WF4
column #15: V-F555W WF4
column #16: V-F814W WF4
column #17: BCV          

file:
-----
wfpc2_bb.color ==> blackbody

format: (1x,i5,1x,2f7.3,1x,4(1x,3(f7.3)),1x,f7.3)

column #1: T_eff
column #2: V-B
column #3: V-I
column #4: V-F439W PC1
column #5: V-F555W PC1
column #6: V-F814W PC1
column #7: V-F439W WF2
column #8: V-F555W WF2
column #9: V-F814W WF2
column #10: V-F439W WF3
column #11: V-F555W WF3
column #12: V-F814W WF3
column #13: V-F439W WF4
column #14: V-F555W WF4
column #15: V-F814W WF4
column #16: BCV          

files:
------
nicmos_BCP98p00.color  ==> atmosphere: BCP98 [Fe/H]=+0.0
nicmos_BCP98m05.color  ==> atmosphere: BCP98 [Fe/H]=-0.5
nicmos_BCP98m10.color  ==> atmosphere: BCP98 [Fe/H]=-1.0
nicmos_BCP98m15.color  ==> atmosphere: BCP98 [Fe/H]=-1.5
nicmos_BCP98m20.color  ==> atmosphere: BCP98 [Fe/H]=-2.0
nicmos_LCB97p00.color  ==> atmosphere: LCB97 [Fe/H]=+0.0
nicmos_LCB97m05.color  ==> atmosphere: LCB97 [Fe/H]=-0.5
nicmos_LCB97m10.color  ==> atmosphere: LCB97 [Fe/H]=-1.0
nicmos_LCB97m15.color  ==> atmosphere: LCB97 [Fe/H]=-1.5
nicmos_LCB97m20.color  ==> atmosphere: LCB97 [Fe/H]=-2.0

format: (1x,i5,1x,f4.1,1x,3f7.3,2x,2(f7.3),2(1x,3(f7.3)),1x,f7.3)

column #1: T_eff
column #2: logg 
column #3: V-J
column #4: V-H
column #5: V-K        
column #6: V-F110W NIC1
column #7: V-F160W NIC1
column #8: V-F222M NIC1
column #9: V-F110W NIC2
column #10: V-F160W NIC2
column #11: V-F222M NIC2
column #12: V-F110W NIC3
column #13: V-F160W NIC3
column #14: V-F222M NIC3
column #15: BCV          

file:
-----
nicmos_bb.color  ==> blackbody 

format: (1x,i5,1x,3f7.3,2x,2(f7.3),2(1x,3(f7.3)),1x,f7.3)

column #1: T_eff
column #2: V-J
column #3: V-H
column #4: V-K        
column #5: V-F110W NIC1
column #6: V-F160W NIC1
column #7: V-F222M NIC1
column #8: V-F110W NIC2
column #9: V-F160W NIC2
column #10: V-F222M NIC2
column #11: V-F110W NIC3
column #12: V-F160W NIC3
column #13: V-F222M NIC3
column #14: BCV