Observations of Lithium in Main Sequences Stars in the Hyades and Other F Stars.

Abstract

view Abstract Citations (3) References Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Observations of Lithium in Main Sequences Stars in the Hyades and Other F Stars. Wallerstein, George ; Herbig, George H. ; Conti, Peter Abstract In addition to the observatioi of field stars discussed in the preceding abstract, we have made a survey of the main sequence stars ii the Hyades. We have determined the Li/Ca ratio for 18 members between types F2 and G4. The lithium abundance in ten members with B - V between 0.50 and 0.68 and one with B- I of 0.36 ranges between 10 and 100 times the solar value. One sharp-lined cluster member of B- V 0.54 and five somewhat rotationally broadened members with B- V between 0.40 and 0.45 do lOt show lithium (a rather high upper limit to the abundance is set by the line broadening). Other main-squence F stars, not in clusters, chosen more or less at random, which have lithium contents of 10-100 times the solar coi Wi t are: ADS 1752A(dF6), 111 Tau(F8V), 27 H 'a B(F4V), and Ser(F6V). Weak lithium lines have been observed in two high-velocity stars, Per (G0V) ai d 10 CVn(G0V), that may be comparable with the sun in age. The following F stars show no lithium ai d hence have upper limits of less than 10-30 times the solar: a CMi(F5IV-V), ir Ori, 9 metallic-line stars, including the 5 in the Hyades, and p CrB. Three of the M - L stars in the Hyades have magnetic fields, as does p CrB, which has a varying field of + t000G. Additionally, p CrB is drastically deficient in oxygen. Therefore we cannot now support the coiltentions that (a) the reduction in oxygei abundance has resulted in spallation-product lithium, or (b) the presence of large scale magnetic fields ilecessarily results in lithium production. Publication: The Astronomical Journal Pub Date: September 1963 DOI: 10.1086/109111 Bibcode: 1963AJ.....68R.298W full text sources ADS | data products SIMBAD (9)