Aging jets from low-mass stars

J. A. Graham, W. P. Chen

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3 Scopus citations


An extended faint optical jet is associated with the compact emission region plus faint star known as HH 55. HH 55 is located in the Lupus 2 cloud 2′SW of the well studied T Tauri star RU Lupi. The HH 55 jet extends 55″N and 35″S in PA 160°. The HH 55 star is an emission line star of spectral type M3.5. Its image in the emission lines of Hα and [S II] is slightly elongated by 2″-3″ to the S but in continuum light is symmetrical and pointlike (FWHM = 1.7″). The star and jet have several features in common with the star and jet known as Sz 102=Th 28 in the nearby Lupus 3 cloud. We suggest that these objects are representative of the late evolutionary stage of the HH jet-outflow phenomenon and point out that such objects may be quite common although difficult to detect. With Lbol≈0.005L, and log Te≈3.5, the HH 55 star is close to the main sequence and evolutionary tracks suggest an age of 3×107 yr.

Original languageEnglish
Pages (from-to)2273-2275
Number of pages3
JournalAstronomical Journal
Issue number6
StatePublished - Dec 1994


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