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The Lithium‐rich supergiant HD172365
Author(s) -
Andrievsky S.M.,
Gorlova N.I.,
Klochkova V.G.,
Kovtyukh V.V.,
Panchuk V.E.
Publication year - 1999
Publication title -
astronomische nachrichten
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.394
H-Index - 63
eISSN - 1521-3994
pISSN - 0004-6337
DOI - 10.1002/1521-3994(199903)320:1<35::aid-asna35>3.0.co;2-f
Subject(s) - supergiant , astrophysics , physics , abundance (ecology) , star (game theory) , open cluster , lithium (medication) , astronomy , luck , blue straggler , star cluster , stars , biology , philosophy , theology , fishery , endocrinology
The F‐type supergiant HD172365 was discovered by Luck (1982) to be a high Li 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 and tentatively conclude that HD172365 may, in fact, be a post‐blue straggler star with a mass ∼2 times greater than the “turn‐off point” mass for the open cluster IC 4756, of which HD172365 is a member. The star is formed by a merger of a close binary system. This conclusion is supported by, for example, its large projected rotational velocity, solar carbon abundance and high lithium content.