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Astron. Astrophys. 358, 233-241 (2000)

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[FORMULA] and [FORMULA] Reticuli and the existence of the [FORMULA] Herculis group *

E.F. del Peloso 1, L. da Silva 1 and G.F. Porto de Mello 2

1 CNPq/Observatório Nacional, Rua General José Cristino, 77, 20921-400 Rio de Janeiro, Brazil (epeloso@eletronuclear.gov.br, licio@on.br)
2 UFRJ/Observatório do Valongo, Ladeira do Pedro Antônio, 43, 20080-090 Rio de Janeiro, Brazil (gustavo@ov.ufrj.br)

Received 15 March 2000 / Accepted 11 April 2000

Abstract

We report the detailed analysis of the solar type stars [FORMULA] and [FORMULA] Reticuli. We obtained accurate effective temperatures ([FORMULA] = 5746 [FORMULA] 27 K and 5859 [FORMULA] 27 K respectively) and surface gravities (log g = 4.54 [FORMULA] 0.02 and 4.46 [FORMULA] 0.01 respectively). Both stars are slightly metal deficient ([Fe/H] = -0.22 [FORMULA] 0.05) and their element abundance patterns are compatible with one another and with the Sun.

The hypothesis, suggested by previous detailed analyses, that these stars could be helium rich relative to the Sun, was investigated. The stars were found to have a normal, solar helium abundance.

We analysed the stars' membership of the [FORMULA] Herculis stellar kinematic group (SKG). Some probable members have nearly the same galactic orbital parameters, chemical composition and evolutionary states, which confirm the existence of a metal deficient SKG. Since we determined that [FORMULA] Herculis does not belong to this group, we propose it be renamed [FORMULA] Reticuli SKG.

Key words: stars: fundamental parameters – stars: abundances – stars: chemically peculiar – Galaxy: open clusters and associations: individual: i  Herculis stellar kinematic group

* Based on observations collected at the European Southern Observatory, La Silla, Chile, and at the Observatório do Pico dos Dias, operated by the Laboratório Nacional de Astrofísica, CNPq, Brazil.

Present address: Eletrobrás Termonuclear S.A., DIES.O, Rodovia Rio-Santos, km 132, 23903-000, Angra dos Reis, RJ, Brazil.

Send offprint requests to: E.F. del Peloso

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© European Southern Observatory (ESO) 2000

Online publication: June 26, 2000
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