Light echoes reveal an unexpectedly cool η Carinae during its nineteenth-century Great Eruption

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dc.contributor.authorRest, A.
dc.contributor.authorPrieto, J. L.
dc.contributor.authorWalborn, N. R.
dc.contributor.authorSmith, N.
dc.contributor.authorBianco, F. B.
dc.contributor.authorChornock, R.
dc.contributor.authorWelch, D. L.
dc.contributor.authorHowell, D. A.
dc.contributor.authorHuber, M. E.
dc.contributor.authorFoley, R. J.
dc.contributor.authorFong, W.
dc.contributor.authorSinnott, B.
dc.contributor.authorBond, H. E.
dc.contributor.authorSmith, R. C.
dc.contributor.authorToledo, I.
dc.contributor.authorMinniti, D.
dc.contributor.authorMandel, K.
dc.date.accessioned2025-01-20T23:59:09Z
dc.date.available2025-01-20T23:59:09Z
dc.date.issued2012
dc.description.abstracteta Carinae is one of the most massive binary stars in the Milky Way(1,2). It became the second-brightest star in our sky during its mid-nineteenth-century 'Great Eruption', but then faded from view (with only naked-eye estimates of brightness(3,4)). Its eruption is unique in that it exceeded the Eddington luminosity limit for ten years. Because it is only 2.3 kiloparsecs away, spatially resolved studies of the nebula have constrained the ejected mass and velocity, indicating that during its nineteenth-century eruption, eta Car ejected more than ten solar masses in an event that released ten per cent of the energy of a typical core-collapse supernova(5,6), without destroying the star. Here we report observations of light echoes of eta Carinae from the 1838-1858 Great Eruption. Spectra of these light echoes show only absorption lines, which are blueshifted by -210 km s(-1), in good agreement with predicted expansion speeds(6). The light-echo spectra correlate best with those of G2-to-G5 supergiants, which have effective temperatures of around 5,000 kelvin. In contrast to the class of extragalactic outbursts assumed to be analogues of the Great Eruption of eta Carinae(7-12), the effective temperature of its outburst is significantly lower than that allowed by standard opaque wind models(13). This indicates that other physical mechanisms such as an energetic blast wave may have triggered and influenced the eruption.
dc.fuente.origenWOS
dc.identifier.doi10.1038/nature10775
dc.identifier.issn0028-0836
dc.identifier.urihttps://doi.org/10.1038/nature10775
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/95282
dc.identifier.wosidWOS:000300287100040
dc.issue.numero7385
dc.language.isoen
dc.pagina.final378
dc.pagina.inicio375
dc.revistaNature
dc.rightsacceso restringido
dc.titleLight echoes reveal an unexpectedly cool η Carinae during its nineteenth-century Great Eruption
dc.typeartículo
dc.volumen482
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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