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The Astrophysical Journal
Article . 1981 . Peer-reviewed
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Field population II blue stragglers

Authors: R.C. Peterson; B.W. Carney;

Field population II blue stragglers

Abstract

Photometry and high-resolution spectra are presented and discussed of metal-poor stars hotter than the turn-off of globular clusters. Very few nonvariable candidates for blue stragglers can be identified One, HD 100363, is probably an old-disk short-period variable. Two, BD+25/sup 0/1981 and BD-12/sup 0/2669, are shown to be near the main sequence, thus being bona fide blue stragglers. The distribution of their abundances of the CNO elements and Al, Mg, Sr, and Ba, with respect to the iron peak, very closely resembles that of the metal-poor field stars of turn-off temperatures. The radial velocity of BD -12/sup 0/2669 is constant to +- 1 km s/sup -1/ on three successive nights. Rotational velocities are found to be 9 +- 2 km s/sup -1/ for BD +25/sup 0/1981 and 31 +- 2 km s/sup -1/ for BD -12/sup 0/2669, in keeping with values of Population I main-sequence stars of the same temperature, after allowing for differences in age. While we can exclude membership in a close binary for BD -12/sup 0/2669, we find no evidence either for or against wide pairs, mass transfer, recent formation, or a prolonged main-sequence lifetime, as the reason for the stragglers' existence.

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citations
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
14
Average
Average
Average
gold