Descripción del código fortran

Errors are computed following Gaia Science Performance web page

Universitat de Barcelona

Contact: Merce Romero-Gomez (mromero@am.ub.es), Josep Manel Carrasco (carrasco@am.ub.es)

Input external tables:

• geometrical factors ('gfactor-Oct2012.dat')
• Radial Velocity coefficients ('TableVr-Oct2012.dat')

• const_math.h : mathematical constants
• const_ast.h : astronomical constants

• gaussdev.f : gasdev, ran2

• Equatorial helicocentric coordinates (units: radians)
• Equatorial proper motions (units: mas/yr)
• Parallax (units: mas)
• Radial velocity (units: km/s)
• V apparent magnitude
• Observed (V-I) colour index (affected by extinction)
• Atmospheric parameters for the star (Teff, logg, [Fe/H], Av)

• Actual parameters of the star (input values, not affected by errors)
• Parameters of the star as observed by Gaia (affected by errors): astrometry, Vr, photometry and atmospheric parameters
• Gaia errors assigned to each parameter:
• The code offers two options depending of the type of errors you want to apply (see website):
  • jflag=1, errors computed from mean geometrical factors (see website)
  • jflag=-1,errors computed considering the scanning law of the satellite (the geometrical factors are then computed from the ecliptic latitude and the number transits)