Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-03-06
Astrophys.J.659:1373-1381,2007
Astronomy and Astrophysics
Astrophysics
8 figures
Scientific paper
10.1086/504826
The Rosette HH1 jet is a collimated flow immersed in the strong UV radiation field of the Rosette Nebula. We investigate the physical properties of the Rosette HH1 jet using high-quality narrow-band images and high-dispersion spectroscopy. The new images show that the axis of the jet is not precisely aligned with the star near the base of the jet. The high resolution of the spectra allows us to accurately determine the contributions from the \ion{H}{2} region, jet, and star. The appoaching and receding sides of the expanding shell of the Rosette Nebula are at heliocentric velocities of 13 and 40 km s$^{-1}$, while the jet reaches a maximum velocity offset at a heliocentric velocity of $-$30 km s$^{-1}$. The [\ion{S}{2}] doublet ratios indicate an electron density of $\sim$1000 cm$^{-3}$ in the jet and $\le$100 cm$^{-3}$ in the \ion{H}{2} region. With a careful subtraction of the nebular and jet components, we find the stellar H$\alpha$ line is dominated by a broad absorption profile with little or no emission component, indicating a lack of substantial circumstellar material. The circumstellar material has most likely been photo-evaporated by the strong UV radiation field in the Rosette Nebula. The evaporation time scale is 10$^3$ -- 10$^4$ yr. The Rosette HH1 jet source provides evidence for an accelerated evolution from a CTTS to a WTTS due to the strong UV radiation field; therefore, both CTTSs and WTTSs can be spatially mixed in regions with massive star formation.
Bally John
Chu Y.-H. Y.-H.
Gruendl Robert A.
Li Jin Zeng
Su Wei
No associations
LandOfFree
Resolving the nature of the Rosette HH1 jet facing strong UV dissipation does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Resolving the nature of the Rosette HH1 jet facing strong UV dissipation, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Resolving the nature of the Rosette HH1 jet facing strong UV dissipation will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-43904