Query : 2018A&A...609A..69G

2018A&A...609A..69G - Astronomy and Astrophysics, volume 609A, 69-69 (2018/1-1)

Numerical modeling of the 1840s major eruption of η Carinae as an explosion.


Abstract (from CDS):

In this paper, new two-dimensional hydrodynamical simulations of η Car's nebulae are performed. In the 1840s, the massive star η Car suffered a major eruption that resulted in the formation of a bipolar structure, which is commonly known as the large Homunculus. During this event, η Car expelled into the circumstellar material a total mass of ∼10M and released a total energy of Ek∼1050erg over a very short time (≤5yr). These kinds of explosive events are frequently called supernova impostors due to their resemblance to a type II supernova, but the stars survive the explosion. In the case of η Car, a brief explosion scenario provides a potential explanation for the behavior of the historical light curve of η Car a few years (∼10yr) after the nineteenth century outburst. Here, such an alternative scenario of an explosion is assumed (instead of a super-Eddington wind) in order to investigate whether an explosive event is also able to explain the shape and kinematics of the large Homunculus. I show that the numerical simulations presented here indeed resemble some of the observed features of the nebula, such as the present-day double-shell structure of the Homunculus, with a thin outer dense shell and a thicker inner layer, as well as thermal instabilities (Rayleigh-Taylor and Kelvin-Helmholtz) along the dense shell that may lead to the current mottled appearance of the large Homunculus. Nonetheless, the explosion model for the 1840s major eruption of η Car is not able to account for the estimated age of the large Homunculus.

Abstract Copyright: © ESO, 2018

Journal keyword(s): stars: individual: η Carinae - stars: winds, outflows - hydrodynamics - shock waves

Simbad objects: 3

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Number of rows : 3
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
1 NGC 3372 HII 10 45 02.23 -59 41 59.8           ~ 945 2
2 NAME Homunculus Nebula ISM 10 45 03.5 -59 41 04           ~ 345 1
3 * eta Car Em* 10 45 03.5377808928 -59 41 04.051599720 6.37 7.03 6.48 4.90 4.41 OBepec 2326 0

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