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The present work aims at studying the dense gas of the molecular cloud LDN1287 (L1287), which harbors a double FU Ori system, an energetic molecularoutflow and a still-forming cluster of deeply embedded low-mass, young stellarobjects, showing a high level of fragmentation. We present optical Halpha and[SII], and VLA NH$_3$ (1,1) and (2,2) observations with an angular resolutionof ~3.5''. The observed NH$_3$ spectra have been analyzed with the HfS tool,fitting simultaneously three different velocity components. The NH$_3$ emissionfrom L1287 comes from four different structures: a core associated with RNO 1,a guitar-shaped core (the "Guitar") and two interlaced filaments (the Blue andRed Filaments) roughly centered towards the binary FU Ori system RNO 1B/C andits associated cluster. Regarding the Guitar Core, there are clear signaturesof gas infall onto a central mass that has been estimated to be ~2.1 $M_\odot$.Regarding the two filaments, they have radii ~0.03 pc, masses per unit length~50 $M_\odot$ pc$^{-1}$, and are near isothermal equilibrium. A central cavity,probably related with the outflow, and also traced by the Halpha and [SII]emission, is identified, with several young stellar objects near its innerwalls. Both filaments show clear signs of perturbation by the high-velocity gasof the outflows driven by one or several young stellar objects of the cluster.The Blue and Red filaments are coherent in velocity and have nearly subsonicgas motions, except at the position of the embedded sources. Velocity gradientsacross the Blue Filament can be interpreted either as infalling material ontothe filament or rotation. Velocity gradients along the filaments areinterpreted as infall motions towards a gravitational well at the intersectionof both filaments.

VLA ammonia observations of L1287: analysis of the "Guitar" core and two filaments