Grupo de Sistemas Estelares

Fernández, M. and Comerón, F.
Astronomy and Astrophysics, Volume 440, Issue 3, September IV 2005, pp.1119-1126 (2005).
09/2005

ABSTRACT

We report the discovery of a jet in a [SII] image of Par-Lup3-4, a remarkable M 5-type pre-main sequence object in the Lupus 3 star-forming cloud. The spectrum of this star is dominated by the emission lines commonly interpreted as tracers of accretion and outflows. Par-Lup3-4 is therefore at the very low-mass end of the exciting sources of jets. High resolution spectroscopy shows that the [SII] line profile is double-peaked, implying that the low excitation jet is seen at a small angle (probably ⪆8^circ) with respect to the plane of the sky. The width of the Hα line suggests a dominating contribution from the accretion columns and from the shocks on the stellar surface. Unresolved Hα emission coming from an object located at 4farcs2 from Par-Lup3-4 is detected at a position angle 30^circ or 210^circ, with no counterpart seen either in visible or infrared images. We also confirm previous evidence of strong mass loss from the very low mass star LS-RCrA 1, with spectral type M 6.5 or later. All its forbidden lines are blueshifted with respect to the local standard of rest (LSR) of the molecular cloud at a position very close to the object and the line profile of the [OI] lines is clearly asymmetric. Thus, the receding jet could be hidden by a disk which is not seen edge-on. If an edge-on disk does not surround Par-Lup3-4 or LS-RCrA 1, an alternative explanation, possibly based on the effects of mass accretion, is required to account for their unusually low luminosities.