Abstract
We have derived the oxygen abundances of 50 F-type main-sequence stars, belonging to the Hyades open cluster, the Ursa Major group, and the field, using an NLTE analysis of the infrared triplet lines of O I at λλ7771-7775. The stars of the middle F-range (6500<T eff <6900 K) have previously been shown to exhibit a marked reduction in lithium abundance compared with both cooler and hotter objects in the same systems: the Li gap, for which several explanations have been proposed. Our results here show a substantial measure of uniformity in the oxygen abundances over the range in T eff between 5800 and 7400 K. The data might indicate a small dip (<0.1 dex) in the oxygen abundance for stars located in the Li gap
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