The spectrum of HD 104237

                                                    

Herbig Ae star-Spectroscopic binary.  A and B are the primary and the secondary stars.


A star parameters : Teff=8000 K, logg=3.7, vturb=2.3 km/sec, vsini=0 km/sec, vmacro=13 km/sec
B star parameters : Teff=5000 K, logg=3.7, vturb=1.0 km/sec (adopted), vsini=12 km/sec 
 
The A star parameters were determined from:
Fe I-Fe II ionization equilibrium, and the constraints of a  mass ratio M(A)/M(B)=1.29 (Boehm et al.,2004)
and a gravity logg=3.7 for the secondary. 

The B star parameters were determined from the Ca I profile at 6122.21 A (the gravity) and the
constraints of a luminosity ratio L(A)/L(B)=8.32 (Boehm et al. 2004) togheter with Teff=8000 K for
the A star.  

The corresponding radii ratio is [R(B)/R(A)]^2=0.77


Abundances used to compute the synthetic spectrum.
                               
                                    A star        B star

                      Li I      -8.64  [+2.30]  -8.90 [+2.04]
                      C I       -3.75  [-0.23]
                      N I       -4.32  [-0.20]   -4.52?[-0.40]
                      O I       -3.35  [-0.14]
                      Na I      -5.81  [-0.10]  -5.71?[ 0.00]      
                      Mg I-II   -4.50  [-0.04]
                      Al I-II   -5.67  [-0.10]  -5.57 [ 0.00] 
                      Si I-II   -4.49  [+0.00]  -4.49 [ 0.00]
                      S I       -4.86  [-0.15] 
                      Ca I-II   -5.68  [+0.00]  -5.68?[ 0.00]
                      Sc II     -9.05  [-0.18]  -8.87 [ 0.00]     
                      Ti II     -7.22  [-0.20]  -7.02 [ 0.00]
                      V I-II    -8.19  [-0.15]  -8.34 [-0.30]
                      Cr I-II   -6.47  [-0.10]  -6.37 [ 0.00]
                      Mn I      -6.80  [-0.15]  -6.65 [ 0.00]
                      Fe I-II   -4.64  [-0.10]  -4.54 [ 0.00]
                      Co I      -7.27  [-0.15]  -7.42 [-0.30]
                      Ni I      -5.89  [-0.10]  -5.79 [ 0.00] 
                      Cu I      -7.93  [-0.10]  -7.83 [ 0.00]
                      Zn I      -7.74  [-0.30]  -7.44 [ 0.00]
                      Sr II     -9.17  [-0.10] 
                      Y II      -9.90  [-0.10]
                      Zr II     -9.44  [+0.00]  
                      Ba II     -9.91  [+0.00]  -8.81?[+1.00]
                      La II    -11.04  [-0.10]