1999A&A...345..949C


Query : 1999A&A...345..949C

1999A&A...345..949C - Astronomy and Astrophysics, volume 345, 949-964 (1999/5-3)

Unveiling the disk-jet system in the massive (proto)star IRAS 20126+4104.

CESARONI R., FELLI M., JENNESS T., NERI R., OLMI L., ROBBERTO M., TESTI L. and WALMSLEY C.M.

Abstract (from CDS):

We present the results of line and continuum observations towards the source IRAS 20126+4104, performed at 1.3mm and 3.5mm with the Plateau de Bure interferometer, from 350µm to 2mm with the James Clerk Maxwell telescope, and at 10 and 20µm with the United Kingdom infrared telescope. The results fully confirm the findings of Cesaroni et al. (1997A&A...325..725C) namely that IRAS 20126+4104 is a very young stellar object embedded in a dense, hot core and lying at the centre of a rotating disk. The bipolar jet imaged by Cesaroni et al. (1997A&A...325..725C) in the 2.122µm H2 line is seen also in the SiO(2-1) transition, which allows to study the velocity field in the jet. A simple model is developed to obtain the inclination angle of the jet (and hence of the disk axis), which turns out to be almost perpendicular to the line of sight. By studying the diameter of the disk in different transitions and the corresponding line widths and peak velocities, one can demonstrate that the disk is Keplerian and collapsing, and thus compute the mass of the central object and the accretion luminosity. We show that if all the mass inducing the Keplerian rotation is concentrated in a single star, then this cannot be a ZAMS star, but more likely a massive protostar which derives its luminosity from accretion.

Abstract Copyright:

Journal keyword(s): ISM: clouds - ISM: individual objects: IRAS 20126+4104 - ISM: molecules - radio lines: ISM

Simbad objects: 5

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Number of rows : 5
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 HH 211 cor 03 43 56.52 +32 00 52.8           ~ 324 0
2 GAL 005.88-00.41 HII 18 00 30.388 -24 04 00.20           ~ 319 0
3 * lam Sgr PM* 18 27 58.2407185 -25 25 18.114589 4.75 3.85 2.81 2.06 1.50 K1IIIb 267 0
4 * gam Sge PM* 19 58 45.4286265 +19 29 31.728079 6.97 5.04 3.47 2.27 1.35 M0-III 253 0
5 IRAS 20126+4104 Y*O 20 14 25.8816769656 +41 13 36.879427236           B2.5-B0.5 415 0

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2022.05.21-01:58:07

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