Isochrone Probability Functions for Old Stellar Systems

Probability Generating Functions for Sattolo’s Algorithm

In 1986 S. Sattolo introduced a simple algorithm for uniform random generation of cyclic permutations on a fixed number of symbols. Recently, H. Prodinger analysed two important random variables associated with the algorithm, and found their mean and variance. H. Mahmoud extended Prodinger’s analysis by finding limit laws for the same two random variables.The present article, starting from the ...

New HST Views at Old Stellar Systems

HST has recently revealed that many among the most massive globular clusters harbor multiple stellar populations, and –most surprisingly– some of them are extremely helium rich. How these clusters managed to generate such complex stellar populations, and what processes let to so dramatic helium enrichment, is today one of the most exciting puzzles in the astrophysics of stellar systems. HST has...

Spectrophotometric Evolution of Old Stellar Systems

An Isochrone Database and a Rapid Model for Stellar Population Synthesis

We first presented an isochrone database that can be widely used for stellar population synthesis studies and color magnitude diagram (CMD) fittings. The database consists of the isochrones of both single and binary stellar populations (SSPs and BSPs). The ranges for the age and metallicity of populations are 0–15 Gyr and 0.0001–0.03, respectively. All data are available for populations with tw...

Isochrone Distributions

are recorded from patients during surgery and from animals in the research laboratory for a variety of purposes. During such recordings, a portion of the cardiac surface is exposed to air, and the remainder of the epicardial surface variably is in contact with conductive tissue. No systematic studies document the degree to which these different conditions affect measured excitation times, poten...