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Aging jets from low-mass starsAn 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 min SW of the well studied T Tauri star RU Lupi. The HH 55 jet extends 55 sec N and 35 sec S in PA 160 deg. The HH 55 star is an emission line star of spectral type M3.5. Its image in the emission lines of H-alpha and (S II) is slightly elongated by 2 sec - 3 sec to the S but in continuum light is symmetrical and pointlike ((full width at half maximum) (FWHM) = 1.7 sec). 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 L(sub bol) approximately = 0.005 solar luminosity, and log T(sub e) approximately = 3.5, the HH 55 star is close to the main sequence and evolutionary tracks suggest an age of 3 x 10(exp 7) yr.
Document ID
Document Type
Reprint (Version printed in journal)
External Source(s)
Graham, J. A.
(Carnegie Institution of Washington, Washington, DC United States)
Chen, W. P.
(National Central University Taiwan, Republic of China)
Date Acquired
August 16, 2013
Publication Date
December 1, 1994
Publication Information
Publication: Astronomical Journal
Volume: 108
Issue: 6
ISSN: 0004-6256
Subject Category
Accession Number
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