Zirconium to Titanium Ratios in a Large Sample of Galactic S Stars

Details Zirconium to Titanium Ratios in a Large Sample of Galactic S Stars Zirconium to Titanium Ratios in a Large Sample of Galactic S Stars

Jan 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002apj...564..395v&link_type=abstract

The Astrophysical Journal, Volume 564, Issue 1, pp. 395-404.

Astronomy and Astrophysics

Astronomy

13

Stars: Abundances, Stars: Agb And Post-Agb, Stars: Evolution, Stars: Fundamental Parameters

Scientific paper

The [Zr/Ti] ratio for a large sample of Galactic S stars has been determined using high-quality, high-resolution spectra. The pattern of Zr enhancements in intrinsic and extrinsic S stars is found to differ, and the [Zr/Ti] ratio in the extrinsic S stars clearly links them to the strong barium stars. In addition, the pattern of [Zr/Ti] ratios seems to indicate that the progression of spectral type M to MS to S to SC is due largely to an increase in the abundance of s-process elements and not solely to a changing C/O ratio as claimed by some investigators (such as Scalo and Ross).

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