GJ 900: A New Hierarchical System with
Low-Mass Components
E.V. Malogolovets, Yu. Yu. Balega, D.A.
Rastegaev, K.-H. Hofmann, and G. Weigelt
Astrophysical Bulletin, Vol.62, No.2,
pg.117-124(2007)
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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