2017A&A...606L...3F


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.04CEST01:31:59

2017A&A...606L...3F - Astronomy and Astrophysics, volume 606, L3-3 (2017/10-1)

Chemical segregation in the young protostars Barnard 1b-N and S. Evidence of pseudo-disk rotation in Barnard 1b-S.

FUENTE A., GERIN M., PETY J., COMMERCON B., AGUNDEZ M., CERNICHARO J., MARCELINO N., ROUEFF E., LIS D.C. and WOOTTEN H.A.

Abstract (from CDS):

The extremely young Class 0 object B1b-S and the first hydrostatic core (FSHC) candidate, B1b-N, provide a unique opportunity to study the chemical changes produced in the elusive transition from the prestellar core to the protostellar phase. We present 40''x70'' images of Barnard 1b in the 13CO 1-0, C18O 1-0, NH2D 11,1a- 10,1s, and SO 32- 21 lines obtained with the NOEMA interferometer. The observed chemical segregation allows us to unveil the physical structure of this young protostellar system down to scales of ∼500au. The two protostellar objects are embedded in an elongated condensation, with a velocity gradient of ∼0.2-0.4m/s/au in the east-west direction, reminiscent of an axial collapse. The NH2D data reveal cold and dense pseudo-disks (R∼500-1000au) around each protostar. Moreover, we observe evidence of pseudo-disk rotation around B1b-S. We do not see any signature of the bipolar outflows associated with B1b-N and B1b-S, which were previously detected in H2CO and CH3OH, in any of the imaged species. The non-detection of SO constrains the SO/CH3OH abundance ratio in the high-velocity gas.

Abstract Copyright: © ESO, 2017

Journal keyword(s): astrochemistry - ISM: clouds - ISM: individual objects: Barnard 1b - stars: formation - stars: low-mass - ISM: kinematics and dynamics - ISM: kinematics and dynamics

VizieR on-line data: <Available at CDS (J/A+A/606/L3): list.dat fits/*>

CDS comments: WD 0137-3457 is WD 0137-349 in SIMBAD.

Simbad objects: 2

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Number of rows : 2

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 BPS CS 29504-0036 WD* 01 39 42.8531448117 -34 42 39.576295162 14.60 15.31 15.33     DA3+dM 66 1
2 V* IK Peg dS* 21 26 26.6606623779 +19 22 32.316865675   6.294 6.064     kA6hA9mF0+DA 167 0

    Equat.    Gal    SGal    Ecl

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2020.07.04-01:31:59

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