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The chromospheric emission-age relation for stars of the lower main sequence and its implications for the star formation rate
Soderblom, David R.; Duncan, Douglas K.; Johnson, Dean R. H.
AA(Space Telescope Science Institute, Baltimore, MD), AB(Space Telescope Science Institute, Baltimore, MD), AC(Space Telescope Science Institute, Baltimore, MD)
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 375, July 10, 1991, p. 722-739. Research supported by NSF and National Geographic Society. (ApJ Homepage)
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NASA/STI Keywords:
Chromosphere, Emission Spectra, Main Sequence Stars, Star Formation Rate, Calcium, Late Stars, Ultraviolet Spectra
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An attempt is made to formulate the relationship between age and chromospheric emission (CE) in late-type dwarf stars. Evidence is reviewed that a deterministic relationship of this type actually exists, and that for stars of known age, either a power-law relation or a curve corresponding to a constant star formation rate fits equally well. Further observations should be able to demonstrate either that there is a real excess of young stars near the sun or that the evolution of CE for a low-mass star goes through a slow initial decline, a rapid decline at intermediate ages, and finally a slow decline for old stars like the sun.

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