Thorium abundance in the atmospheres of AM stars

Details Thorium abundance in the atmospheres of AM stars Thorium abundance in the atmospheres of AM stars

Jan 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985afz....22...63l&link_type=abstract

(Astrofizika, vol. 22, Jan.-Feb. 1985, p. 63-74) Astrophysics (ISSN 0571-7132), vol. 21, no. 1, July 1985, p. 36-43. Translation

Astronomy and Astrophysics

Astrophysics

5

A Stars, Metallicity, Peculiar Stars, Stellar Atmospheres, Stellar Composition, Stellar Spectra, Thorium, Oscillator Strengths, Stellar Temperature

Scientific paper

It has been shown that in the spectra of relatively cool Am stars quite a strong line Th II λ4019.13 must be present, if thorium is overabundant in their atmospheres over ten times. While investigating four Am stars in the spectra of three of them - 15 Vul, 16 Ori and 63 Tau - the authors found the sharp line Th II λ4019.13, but in the spectrum of 81 Tau there were no obvious signs of this line. Comparing synthetic spectra with the observed ones the authors found the abundance of thorium to be equal to lg ɛ(Th) = 1.5 - 1.8 for 15 Vul, 16 Ori and 63 Tau and lg ɛ(Th) ≤ 0.4 for 81 Tau. Thus three of the four Am stars are considerably overabundant in thorium in relation to the solar value lg ɛ(Th)_sun; = 0.2.

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