2022ApJ...935...76Z


Query : 2022ApJ...935...76Z

2022ApJ...935...76Z - Astrophys. J., 935, 76 (2022/August-3)

Catching the Butterfly and the Homunculus of η Carinae with ALMA.

ZAPATA L.A., LOINARD L., FERNANDEZ-LOPEZ M., TOALA J.A., GONZALEZ R.F., RODRIGUEZ L.F., GULL T.R., MORRIS P.W., MENTEN K.M. and KAMINSKI T.

Abstract (from CDS):

The nature and origin of the molecular gas component located in the circumstellar vicinity of η Carinae are still far from being completely understood. Here, we present Atacama Large Millimeter/submillimeter Array CO(3-2) observations with a high angular resolution (∼0.″15) and a great sensitivity that are employed to reveal the origin of this component in η Carinae. These observations reveal much higher velocity (-300 to +270 km s–1) blue- and redshifted molecular thermal emission than previously reported, which we associate with the lobes of the Homunculus Nebula, and which delineates very well the innermost contours of the red- and blueshifted lobes likely due to limb brightening. The inner contour of the redshifted emission was proposed to be a disrupted torus, but here we reveal that it is at least part of the molecular emission originating from the lobes and/or the expanding equatorial skirt. On the other hand, closer to systemic velocities (±100 km s–1), the CO molecular gas traces an inner butterfly-shaped structure that is also revealed at near-IR and mid-IR wavelengths as the region in which the shielded dust resides. The location and kinematics of the molecular component indicate that this material has formed after the different eruptions of η Carinae.

Abstract Copyright: © 2022. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Evolved stars

Simbad objects: 9

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Number of rows : 9
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 QSO B0537-441 BLL 05 38 50.36155950 -44 05 08.9390233   15.77 16.48 16   ~ 882 2
2 PMN J1032-5917 Rad 10 32 42.52474 -59 17 57.0022           ~ 11 0
3 NAME Little Homunculus ISM 10 45 -59.7           ~ 71 2
4 NAME Homunculus Nebula ISM 10 45 03.5 -59 41 04           ~ 368 1
5 * eta Car Em* 10 45 03.5377808928 -59 41 04.051599720 6.37 7.03 6.48 4.90 4.41 LBV 2435 0
6 ICRF J104742.9-621714 QSO 10 47 42.95229991 -62 17 14.6339246   19.99       ~ 48 0
7 V* AG Car WR* 10 56 11.5781414448 -60 27 12.810673260 7.00 7.57 6.96 7.73   WN11h 630 0
8 QSO B1104-445 QSO 11 07 08.69412105 -44 49 07.6183013   17.84 18.2 17.37   ~ 244 1
9 PN M 2-9 PN 17 05 37.96152 -10 08 32.5068           ~ 522 0

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