Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...375..722s&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 375, July 10, 1991, p. 722-739. Research supported by NSF and National Geog
Astronomy and Astrophysics
Astrophysics
158
Chromosphere, Emission Spectra, Main Sequence Stars, Star Formation Rate, Calcium, Late Stars, Ultraviolet Spectra
Scientific paper
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.
David Soderblom R.
Duncan Douglas K.
Johnson Dean R. H.
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