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Speckle interferometric observations made with the 6 m telescope of theSpecial Astrophysical Observatory of the Russian Academy of Sciences in 2000revealed the triple nature of the nearby ($\pi_{Hip}=51.80\pm1.74$ mas)low-mass young ($\approx200$ Myr) star GJ 900. The configuration of the triplesystem allowed it to be dynamically unstable. Differential photometry performedfrom 2000 through 2004 yielded $I$- and $K$-band absolute magnitudes andspectral types for the components to be $I_{A}$=6.66$\pm$0.08,$I_{B}$=9.15$\pm$0.11, $I_{C}$=10.08$\pm$0.26, $K_{A}$=4.84$\pm$0.08,$K_{B}$=6.76$\pm$0.20, $K_{C}$=7.39$\pm$0.31, $Sp_{A}$$\approx$K5--K7,$Sp_{B}$$\approx$M3--M4, $Sp_{C}$$\approx$M5--M6. The ``mass--luminosity''relation is used to estimate the individual masses of the components:$\mathcal{M}_{A}$$\approx0.64\mathcal{M}_{\odot}$,$\mathcal{M}_{B}$$\approx0.21\mathcal{M}_{\odot}$,$\mathcal{M}_{C}$$\approx0.13\mathcal{M}_{\odot}$. From the observations of thecomponents relative motion in the period 2000--2006, we conclude that GJ 900 isa hierarchical triple star with the possible orbital periodsP$_{A-BC}$$\approx$80 yrs and P$_{BC}$$\approx$20 yrs. An analysis of the 2MASSimages of the region around GJ 900 leads us to suggest that the system caninclude other very-low-mass components.

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