The Lithium-rich supergiant HD172365

The F-type supergiant HD172365 was discovered by Luck (1982) to be a high L i abundance star. We find that the lithium abundance in this star is log A( Li) = 2.9 from a careful spectroscopic study. This value is larger than the abundance derived by Luck. We discuss the properties of this supergiant an d tentatively conclude that HD172365 may, in fact, be a post-blue straggler star with a mass similar to 2 times greater than the "turn-off point" mass for the open cluster IC 4756, of which HD172365 is a member. The star is f ormed by a merger of a close binary system. This conclusion is supported by , for example, its large projected rotational velocity, solar carbon abunda nce and high lithium content.