Field population II blue stragglers

Details Field population II blue stragglers Field population II blue stragglers

Dec 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...251..190c&link_type=abstract

Astrophysical Journal, Part 1, vol. 251, Dec. 1, 1981, p. 190-200. Research supported by the University of North Carolina

Astronomy and Astrophysics

Astrophysics

46

Abundance, Blue Stars, Globular Clusters, Star Distribution, Stellar Spectrophotometry, Stellar Temperature, Aluminum, Barium, Magnesium, Red Shift, Stellar Atmospheres, Stellar Evolution, Stellar Rotation, Strontium

Scientific paper

Photometry and high-resolution spectra of metal-poor stars hotter than the turn-off of globular clusters are presented and discussed. It is shown that the number of field stars that are Population II stragglers is extremely small, with only two (BD +25 deg 1981 and BD -12 deg 2669) which are brighter than V = 12, not variable, and have metallicities less than one-tenth solar. The distribution of their abundances of the CNO elements and Al, Mg, Sr, and Ba, with respect to the iron peak, very closely resemble that of the metal-poor field stars of turn-off temperatures. Radial velocities ruled out a short-period binary in the case of BD -12 deg 2669, and argue against it in BD +25 deg 1981. In addition, no evidence is found for or against wide pairs, mass transfer, recent formation, or prolonged main-sequence lifetimes as the reason for the stragglers' existence.

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