Precision masses of the low-mass binary system GJ 623

Frantz Martinache*, James P. Lloyd, Michael J. Ireland, Ryan S. Yamada, Peter G. Tuthill

*Corresponding author for this work

Research output: Contribution to journalArticle

36 Citations (Scopus)

Abstract

We have used aperture masking interferometry and adaptive optics (AO) at the Palomar 200 inch telescope to obtain precise mass measurements of the binary M dwarf GJ 623. AO observations spread over 3 yr combined with a decade of radial velocity measurements constrain all orbital parameters of the GJ 623 binary system accurately enough to critically challenge the models. The dynamical masses measured are m1 = 0.371 ± 0.015 M (4%) and m2 = 0.115 ± 0.0023 M (2%) for the primary and the secondary, respectively. Models are not consistent with color and mass, requiring very low metallicities.

Original languageEnglish
Pages (from-to)496-501
Number of pages6
JournalAstrophysical Journal
Volume661
Issue number1 I
DOIs
Publication statusPublished - 20 May 2007
Externally publishedYes

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