User talk:Bqxiao


 * Our MW Stellar population study
 * 1) Some elements for this study

Metallicity & alpha-enhancement [M/H] = log (Z/Z ) [Fe/H] = log (Z/Z ) − [α/Fe] Star Formation

Since about half of the stars are known to be in multiple systems,the HST LF   misses  essentially all companions(CHABRIER. 2003 PASP, 115:763–795).
 * 1) Binary system

{A&A,2005,436,895 Star counts in the Galaxy Simulating from very deep to very shallow photometric surveys with the TRILEGAL code}