The most metal-poor quadruple system of subdwarfs G89-14 |
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Authors: | D. A. Rastegaev |
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Affiliation: | (1) Special Astrophysical Observatory, Russian Academy of Sciences, pos. Nizhnii Arkhys, 357169 Nizhnii Arkhys, Russia |
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Abstract: | The system of subdwarfs G89-14 is one of the most metal-poor multiple stars with an atmospheric metal abundance [m/H] = ?1.9. Speckle interferometry at the 6-m BTA telescope has revealed that G89-14 consists of four components. Measurements of the magnitude difference between the components and published data have allowed their masses to be estimated: M A ≈ 0.67 M ⊙, M B ≈ 0.24M ⊙,M C ≈ 0.33M ⊙, andM D ≈ 0.22M ⊙. The ratio of the orbital periods of the subsystems has been obtained, 0.52 yr: 3000 yr: 650 000 yr (1: 5769: 1 250 000), indicative of a high degree of hierarchy o fG89-14 and its internal dynamical stability. The calculated Galactic orbital elements and the low metallicity of the quadruple system suggest that it belongs to the Galactic halo. |
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Keywords: | metal-poor stars double and multiple stars |
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