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GJ 900: A new hierarchical system with low-mass components

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Abstract

Speckle interferometric observations made with the 6 m telescope of the Special Astrophysical Observatory of the Russian Academy of Sciences in 2000 revealed the triple nature of the nearby (π Hip = 51.80 ± 1.74 mas) low-mass young (≈ 200 Myr) star GJ 900. The configuration of the triple system allowed it to be dynamically unstable. Differential photometry performed from 2000 through 2004 yielded I- and K-band absolute magnitudes and spectral types for the components to be I A =6.66±0.08, I B =9.15±0.11, I C =10.08±0.26, K A =4.84±0.08, K B =6.76±0.20, K C =7.39±0.31, Sp A ≈K5−K7, Sp B ≈M3−M4, Sp C ≈M5−M6. The “mass-luminosity” relation is used to estimate the individual masses of the components: M A ≈0.64M ⊙, M B ≈0.21M ⊙, M C ≈0.13M ⊙. From the observations of the components’ relative motion in the period 2000–2006, we conclude that GJ 900 is a hierarchical triple star with the possible orbital periods PA-BC≈80 yrs and PBC≈20 yrs. An analysis of the 2MASS images of the region around GJ 900 leads us to suggest that the system can include other very-low-mass components.

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Authors and Affiliations

  1. Special Astrophysical Observatory of the Russian AS, Nizhnij Arkhyz, 369167, Russia

    E. V. Malogolovets, Yu. Yu. Balega & D. A. Rastegaev

  2. Max-Planck Institut für Radioastronomie, Bonn, Germany

    K. -H. Hofmann & G. Weigelt

Authors
  1. E. V. Malogolovets
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  2. Yu. Yu. Balega
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  3. D. A. Rastegaev
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  4. K. -H. Hofmann
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  5. G. Weigelt
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Additional information

Original Russian Text © E.V.Malogolovets, Yu.Yu.Balega, D.A.Rastegaev, K.-H.Hofmann, G.Weigelt, 2007, published in Astrofizicheskij Byulleten, 2007, Vol. 62, No. 2, pp. 131–138.

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Malogolovets, E.V., Balega, Y.Y., Rastegaev, D.A. et al. GJ 900: A new hierarchical system with low-mass components. Astrophys. Bull. 62, 117–124 (2007). https://doi.org/10.1134/S1990341307020034

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  • DOI: https://doi.org/10.1134/S1990341307020034

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