2010ApJ...712.1403P


C.D.S. - SIMBAD4 rel 1.7 - 2020.02.25CET23:51:35

2010ApJ...712.1403P - Astrophys. J., 712, 1403-1409 (2010/April-1)

Confirmation of a recent bipolar ejection in the very young hierarchical multiple system IRAS 16293-2422.

PECH G., LOINARD L., CHANDLER C.J., RODRIGUEZ L.F., D'ALESSIO P., BROGAN C.L., WILNER D.J. and HO P.T.P.

Abstract (from CDS):

We present and analyze two new high-resolution (∼0{farcs}3), high-sensitivity (∼50 µJy/beam) Very Large Array 3.6 cm observations of IRAS 16293-2422 obtained in 2007 August and 2008 December. The components A2α and A2β recently detected in this system are still present, and have moved roughly symmetrically away from source A2 at a projected velocity of 30-80 km/s. This confirms that A2α and A2β were formed as a consequence of a very recent bipolar ejection from A2. Powerful bipolar ejections have long been known to occur in low-mass young stars, but this is–to our knowledge–the first time that such a dramatic one is observed from its very beginning. Under the reasonable assumption that the flux detected at radio wavelengths is optically thin free-free emission, one can estimate the mass of each ejecta to be of the order of 10–8 M. If the ejecta were created as a consequence of an episode of enhanced mass loss accompanied by an increase in accretion onto the protostar, then the total luminosity of IRAS 16293-2422 ought to have increased by 10%-60% over the course of at least several months. Between A2α and A2β, component A2 has reappeared, and the relative position angle between A2 and A1 is found to have increased significantly since 2003-2005. This strongly suggests that A1 is a protostar rather than a shock feature, and that the A1/A2 pair is a tight binary system. Including component B, IRAS 16293-2422 therefore appears to be a very young hierarchical multiple system.

Abstract Copyright:

Journal keyword(s): astrometry - binaries: general - radio continuum: stars - stars: formation - stars: individual: IRAS 16293-2422

Simbad objects: 8

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Number of rows : 8

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 3C 286 Sy1 13 31 08.2885060664 +30 30 32.960825108   17.51 17.25     ~ 3660 1
2 QSO B1622-253 QSO 16 25 46.89164010 -25 27 38.3267989   21.3 20.6 19.60   ~ 293 1
3 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 2971 0
4 IRAS 16293-2422 cor 16 32 22.56 -24 28 31.8           ~ 1013 1
5 NAME IRAS 16293-2422B Y*O 16 32 22.63 -24 28 31.8           ~ 168 0
6 [W89] A2 Rad 16 32 22.866 -24 28 35.90           ~ 21 0
7 [W89] A1 Rad 16 32 22.887 -24 28 35.67           ~ 22 0
8 LDN 1689N DNe 16 32 31 -24 28.6           ~ 108 0

    Equat.    Gal    SGal    Ecl

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2020.02.25-23:51:35

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