Aging jets from low-mass stars

J. A. Graham; W. P. Chen

doi:10.1086/117240

Aging jets from low-mass stars

J. A. Graham, W. P. Chen

Graduate Institute of Astronomy

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Abstract

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 L_bol≈0.005L_⊙, and log T_e≈3.5, the HH 55 star is close to the main sequence and evolutionary tracks suggest an age of 3×10⁷ yr.

Original language	English
Pages (from-to)	2273-2275
Number of pages	3
Journal	Astronomical Journal
Volume	108
Issue number	6
DOIs	https://doi.org/10.1086/117240
State	Published - Dec 1994

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abstract = "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.",

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N2 - 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.

AB - 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.

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Aging jets from low-mass stars

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