On the Structure of the Upper HRD of Humphreys

Conference paper
Part of the Astrophysics and Space Science Library book series (ASSL, volume 109)


The observational HR diagram of luminous galactic stars, compiled by Humphreys (1978) Is a benchmark In the study of these objects. The diagram was considered as resulting from continuous star formation, and has been used by many authors to put constraints on the evolution of massive stars (Bertelll et al., Maeder: this conference; Bressan et al., 1981; Doom, 1982a). However, there is a puzzling characteristic of this HRD: there are too many stars outside the main sequence band.


Star Formation Massive Star Main Sequence Puzzling Characteristic Stellar Density 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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  1. Bressan, A.G.; Bertelli, G.; Chlosi, C.: 1981: Astron. Astrophys. 102, 25.ADSGoogle Scholar
  2. Doom, C.: 1982a: Astron. Astrophys. 116, 303.ADSGoogle Scholar
  3. Doom, C.: 1982b: Astron. Astrophys. 116, 308.ADSGoogle Scholar
  4. Humphreys, R.M.: 1978: Astrophys. J. Suppl. Ser. 38, 309.CrossRefADSGoogle Scholar
  5. Bertelli, G.; Bressan, A.G.; Chiosi, C.: 1983: Astron. Astrophys. (in press).Google Scholar

Copyright information

© D. Reidel Publishing Company 1984

Authors and Affiliations

  • C. Doom
    • 1
  1. 1.Astrophysieal InstituteVrlje Universitelt BrusselBelgium

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