An Asymmetric Outflow from the Herbig Ae Star HD 163296

Details An Asymmetric Outflow from the Herbig Ae Star HD 163296 An Asymmetric Outflow from the Herbig Ae Star HD 163296

Oct 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006apj...650..985w&link_type=abstract

The Astrophysical Journal, Volume 650, Issue 2, pp. 985-997.

Astronomy and Astrophysics

Astronomy

21

Ism: Herbig-Haro Objects, Ism: Individual (Hh 409 A), Ism: Individual (Hh 409 C), Ism: Jets And Outflows, Shock Waves, Stars: Individual: Henry Draper Number: Hd 163296, Stars: Pre-Main-Sequence

Scientific paper

We present an observational picture of the HH 409 bipolar outflow including the detection of six previously unreported Herbig-Haro knots from the Herbig Ae star HD 163296. This study combines seven years of data from ground-based Fabry-Pérot and HST coronagraphic imagery, as well as HST long-slit spectral imagery. The redshifted counterjet includes a chain of six Herbig-Haro knots spanning >27" to the northeast (P.A.~42deg) of the source and has been active for >80 yr. The brightest knot in the counterjet is HH 409 C, a low-excitation bow shock with a shock velocity Vs~50 km s-1 and total space motion Vjet~260 km s-1. The presence of additional knots in the counterjet beyond the bow shock may indicate precession of the jet axis. The blueshifted jet includes two closely spaced knots within 10" and a distant bow shock (~21") southwest (P.A.~223deg) of the source. The brightest knot in the jet is HH 409 A, a higher excitation more bullet-like shock with Vs~90 km s-1 and Vjet~360 km s-1. The average opening angles for both the jet and counterjet are similar, αa~2deg, and consistent with opening angles of lower mass T Tauri stars. The mass-loss rates in both lobes of the flow, despite the asymmetry of the knots, are also comparable, M˙out~1.0×10-8 Msolar yr-1. This suggests that variations in the mass outflow rate are not more than a factor of ~2.

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