Synthetic HR-diagrams for massive stars

Details Synthetic HR-diagrams for massive stars Synthetic HR-diagrams for massive stars

Apr 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990ap%26ss.166..229n&link_type=abstract

Astrophysics and Space Science (ISSN 0004-640X), vol. 166, no. 2, April 1990, p. 229-258. Research supported by CNR.

Astronomy and Astrophysics

Astrophysics

8

Hertzsprung-Russell Diagram, Stellar Mass, Supermassive Stars, Color-Magnitude Diagram, Main Sequence Stars, Mass To Light Ratios, Stellar Evolution, Stellar Luminosity

Scientific paper

Observations of luminous stars are compared to synthetic HR diagrams generated from three set of evolutionary models. Models computed taking into account a moderate opacity enhancement in the region of the CNO ionization, in addition to mass loss and convective overshoot, can be accepted at the 95 percent significance level. However, even in this case the distribution of luminous stars in the HR diagarm can be fittted only adopting an initial mass function (IMF) slightly steeper than the Salpeter one and by supposing that a fraction of the luminous stars are still not included in the counts either by photometric incompleteness of the data or intrinsic invisibility. On the contrary, the other models that incorporate mass loss and convective overshoot only can be rejected at better than 95 percent confidence under any assumption for the IMF slope and fraction of missing stars.

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