Output file content

The content of the IAC-star output file is as follows:

• Head: It contains information about the input parameters. In particular:
  • The total number of computed and stored stars.

  • The minimum luminosity or maximum magnitude stored.

  • The courrent age and the SFR law.

  • The CEL and IMF parameters.

  • The fraction of binaries and minimum secondary to primary mass ratio.

  • A heading line for the column content, including a list of the photometric bands for which magnitudes have been computed. Although in the current version this is limited to the Johnson-Cousins plus IR most common filters, the list may be expanded, reduced or changed in the future as an optional feature.

• Column 1: $\log L$ of the star. If it is a binary, this (and the following four columns) corresponds to the primary (most massive star) of the sistem. The value -9.999 is stored if this star is a dead member of binary with an alive secondary.

• Column 2: $\log T_{\rm eff}$ of the same star. The value -9.999 is stored if the star is dead, as in column 1.

• Column 3: $\log g$, where $g$ is the surface gravity, for the same star. The value -9.999 is stored if the star is dead, as in column 1.

• Column 4: The initial mass of the star.

• Column 5: The current mass of the star. The mass of the remnant is stored if the star is dead.

• Column 6: $\log L$ of the secondary (less massive star) of the binary sistem. The value -9.999 is stored if the star is not a binary. Note that, since life time is larger for less massive stars and mass transfer is not considered, it is impossible that the secondary is dead and the primary alive in a binary system. On the other hand, if both components of the binary were dead, they would not be written in the output file (although they would have been considered for the total mass calculation).

• Column 7: $\log T_{\rm eff}$ of the same star. The value -9.999 is stored if the star is not a binary, as in column 6.

• Column 8: $\log g$ of the same star. The value -9.999 is stored if the star is not a binary, as in column 6.

• Column 9: The initial mass of the star. The value 0 is stored if the star is not a binary. See what has been said in column 6 for dead stars.

• Column 10: The current mass of the star. The value 0 is stored if the star is not a binary. See what has been said in column 6 for dead stars.

• Column 11: The age of the star. If it is a binary, both members are assumed to have the same age.

• Column 12: The metallicity of the star. If it is a binary, both members are assumed to have the same metallicity.

• Column 13: The secondary to primary initial mass ratio of the binary. If the star is not a binary the value 0 is stored.

• Column 14: Bolometric magnitude of the system (primary plus secondary if it is a binary).

• From column 15 ahead: magnitudes of the system (primary plus secondary if it is a binary) in the filters listed in the head.

• Closing: Integrated quantities are provided in the file closing lines. In particular:
  • The total number of i) ever formed, ii) currently alive and iii) stored stars (single and binary) and the same for binaries only.

  • The total mass ever incorporated into stars (in other words, this is just the time integral of the SFR, $\int_0^T \psi(t) {d}t$).

  • The mass currently locked into alive stars and into stellar remnants.

  • The logarithm of the total luminosity and the integrated magnitudes.

  • The logarithm of the sume of squared luminosities ( $\log\sum_{\rm i} L_{\rm i}^2$, where $L_{\rm i}$ is the luminosity of the i-th star if it is single or the total luminosity of the system, if it is binary) and the magnitudes derived from this. These are the magnitudes associated to surface brightness fluctuations (SBF). In this sense, IAC-star can be used as a SBF population sysnthesis code (see Marín-Franch & Aparicio 2003).