PINGAS: a program that computes the number of stars expected in a region of the sky, Given the galactic coordinates, the band (U,B,V,R,I,J,K,L), and the limiting magnitude . Based on a model of the Galaxy, developed by Roberto Ortiz and Jacques Lepine

PINGAS

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EXTIN.PRO computes extinction in the Galaxy

It is written in IDL language and does not require external functions. Is computes the extinction in the visible (Av) along a path from the Sun to any point in the Galaxy, specified by galactic coordinates and distance. It asks for galactic longitude and latitude (in degrees), and distance (in kpc). It corresponds to the axis-symmetric model of Amores & Lepine. (Astronomical Journal, 130, pp659-673, --2005). EXTIN.F is a FORTRAN version.

EXTIN.PRO EXTIN.F

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EXTINSPIRAL.PRO also computes extinction in the Galaxy, but in a more sophisticated way, since it takes into account the spiral arms. It corresponds to the Spiral (S) model of the same paper. It asks for the same input parameters of EXTIN.PRO and gives the same type of result. It requires the functions SPIRAL2.PRO and ARMDENS.PRO to work. These 3 files must be in the same directory and compiled together. Additional explanations on the steps performed by the programs have been introduced as comments in the program themselves.

The 3 programs are given below; you can just copy and paste them in your IDL editor, giving them the same names below.

EXTINSPIRAL.PRO ARMDENS.PRO SPIRAL2.PRO

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FRACTALS. We developed several programs to construct interstellar molecular clouds with fractal density distribution. See the paper by A.Hetem and J.R.D. Lépine in Astronomy and Astrophysics, 270, 451 (1993). You can download the zipped programs. If you have questions, better ask directly to Annibal Hetem (annibal.hetem.jr@usa.net) FRACTALS