2014A&A...563A..87E


C.D.S. - SIMBAD4 rel 1.7 - 2019.08.25CEST16:40:29

2014A&A...563A..87E - Astronomy and Astrophysics, volume 563A, 87-87 (2014/3-1)

Relating jet structure to photometric variability: the Herbig Ae star HD 163296.

ELLERBROEK L.E., PODIO L., DOUGADOS C., CABRIT S., SITKO M.L., SANA H., KAPER L., DE KOTER A., KLAASSEN P.D., MULDERS G.D., MENDIGUTIA I., GRADY C.A., GRANKIN K., VAN WINCKEL H., BACCIOTTI F., RUSSELL R.W., LYNCH D.K., HAMMEL H.B., BEERMAN L.C., DAY A.N., HUELSMAN D.M., WERREN C., HENDEN A. and GRINDLAY J.

Abstract (from CDS):

Herbig Ae/Be stars are intermediate-mass pre-main sequence stars surrounded by circumstellar dust disks. Some are observed to produce jets, whose appearance as a sequence of shock fronts (knots) suggests a past episodic outflow variability. This ``jet fossil record'' can be used to reconstruct the outflow history. We present the first optical to near-infrared (NIR) spectra of the jet from the Herbig Ae star HD 163296, obtained with VLT/X-shooter. We determine the physical conditions in the knots and also their kinematic ``launch epochs''. Knots are formed simultaneously on either side of the disk, with a regular interval of ∼16 yr. The velocity dispersion versus jet velocity and the energy input are comparable between both lobes. However, the mass-loss rate, velocity, and shock conditions are asymmetric. We find {dot}(M)jet/{dot}(M)acc∼0.01-0.1, which is consistent with magneto-centrifugal jet launching models. No evidence of any dust is found in the high-velocity jet, suggesting a launch region within the sublimation radius (<0.5au). The jet inclination measured from proper motions and radial velocities confirms that it is perpendicular to the disk. A tentative relation is found between the structure of the jet and the photometric variability of the central source. Episodes of NIR brightening were previously detected and attributed to a dusty disk wind. We report for the first time significant optical fadings lasting from a few days up to a year, coinciding with the NIR brightenings. These are very likely caused by dust lifted high above the disk plane, and this supports the disk wind scenario. The disk wind is launched at a larger radius than the high-velocity atomic jet, although their outflow variability may have a common origin. No significant relation between outflow and accretion variability could be established. Our findings confirm that this source undergoes periodic ejection events, which may be coupled with dust ejections above the disk plane.

Abstract Copyright:

Journal keyword(s): stars: formation - circumstellar matter - stars: variables: T Tauri, Herbig Ae/Be - ISM: jets and outflows - objects - stars: individual: HD 163296

Simbad objects: 6

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Number of rows : 6

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2019
#notes
1 NAME DG Tau B Y*O 04 27 02.666 +26 05 30.38           ~ 125 1
2 V* RW Aur TT* 05 07 49.538 +30 24 05.07   10.86 9.60 9.95   K1/5e+K5e 692 0
3 V* FU Ori FU* 05 45 22.3650208559 +09 04 12.296285806   10.72 9.60     F0Iab 681 1
4 HH 1042 HH 08 59 21.670 -43 45 31.05           ~ 8 0
5 GD 153 WD* 12 57 02.3224875106 +22 01 52.634392478 11.883 13.060 13.349 13.488 13.669 DA1.2 296 0
6 HD 163296 Ae* 17 56 21.2882188601 -21 57 21.872343282 7.00 6.93 6.85 6.86 6.67 A1Vep 720 0

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2019.08.25-16:40:29

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