The stellar content of soft X-ray surveys. I. an age dependent numerical model.

Details The stellar content of soft X-ray surveys. I. an age dependent numerical model. The stellar content of soft X-ray surveys. I. an age dependent numerical model.

Dec 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26a...316...89g&link_type=abstract

Astronomy and Astrophysics, v.316, p.89-101

Statistics

59

X-Ray: Stars, Stars: Late Type, Galaxy: Stellar Content, Stars: Statistics

Scientific paper

We present a numerical model allowing a global prediction of the stellar content of flux limited X-ray surveys, based on the age dependent stellar population model developed at Besancon. Age of stars, the main parameter driving coronal emission, is physically taken into account and allows a better handling of the steeply varying stellar X-ray activity with age. Scale heights of various age groups are self-consistently determined through the resolution of the Poisson and Boltzmann equations for the whole mass model, assuming a given age-velocity dispersion relation for the disc. We account for the occurrence of unresolved multiple systems by using binary corrected luminosity functions. We also take into account the most recent X-ray luminosity functions derived from ROSAT observations of young galactic clusters. The model is capable of predicting integral source counts but also distributions in distances, visual magnitudes and various colour indices. We compare the present work with previous models predictions at various galactic latitudes and discuss the origin of the differences found. Using computations performed for the PSPC detector we quantify the contribution of main sequence stars later than A to ROSAT survey and pointed observations. We also show that, according to the model, most of the active coronae detected in the ROSAT all-sky survey are younger than =~1Gyr.

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