Technetium in late-type stars. I - Observations

Details Technetium in late-type stars. I - Observations Technetium in late-type stars. I - Observations

Sep 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979aj.....84.1374l&link_type=abstract

Astronomical Journal, vol. 84, Sept. 1979, p. 1374-1383. NSF-supported research.

Astronomy and Astrophysics

Astronomy

39

Abundance, Late Stars, Stellar Spectra, Technetium, Variable Stars, Carbon Stars, Early Stars, M Stars, Metallic Stars, Mira Variables, Nuclear Fusion, S Stars, Tables (Data)

Scientific paper

An analysis of about 90 spectra (11 or 13 A/mm) of nonvariable and variable (mostly Mira variables) M, MS, S, CS, and C stars for the presence of the radioactive element technetium (half-life of about 200,000 y) suggests that Tc is most often present at certain variability periods. Stars with no Tc I lines in their spectra can be found at most periods (mean period, 234 d), whereas stars with Tc I lines have periods in most cases in excess of 300 days (mean period, 330 d + or - 83 d). Interpreting the data in terms of kinematic studies by Feast (1963) suggests that the stars with Tc are Pop I and that variables without Tc are largely Pop II type stars.

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