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dc.date.accessioned 2024-06-14T16:29:46Z
dc.date.available 2024-06-14T16:29:46Z
dc.date.issued 2024
dc.identifier.uri http://sedici.unlp.edu.ar/handle/10915/167282
dc.description.abstract Changes in the flux and spectrum of Eta Carinae (η Car) since 1900 have been attributed to the evolution of the central binary by some. Others suggest evolution in the occulting ejecta. The brightness jump in the 1940s, which coincided with the appearance of narrow forbidden emission lines, may have been caused by the clearing and ionization of intervening circumstellar ejecta. The brightening changed at a slower pace up through 40 yr later. Here we continue earlier studies focused on the long-term, showing that the forbidden line emission increased in the early 1990s with no noticeable increase in the brightness of the Homunculus. We interpret that the increase in narrow-line emission is due to decreased extinction in the line of sight (LOS) from the central binary to the Weigelt clumps. In 2000, the central stellar core increased in brightness at a faster rate without associated changes in the Homunculus. By 2018, hundreds of narrow-line absorptions from singly ionized metals in our LOS from (η Car) disappeared, thought to be caused by increased ionization of metals. These three events (1990, 2000, and 2018) are explained by the dissipation of circumstellar material within the Homunculus close to the binary. Combining these changes with the steadiness of the Homunculus and the primary winds over the past four decades indicates that circumstellar ejecta in our direction have been cleared. en
dc.language en es
dc.subject Massive stars es
dc.title Long-term evolution in ionization of ejecta illuminated by Eta Carinae en
dc.type Articulo es
sedici.identifier.other https://doi.org/10.3847/1538-4357/ad198c es
sedici.identifier.issn 1538-4357 es
sedici.creator.person Damineli, Augusto es
sedici.creator.person Richardson, Noel D. es
sedici.creator.person Navarete, Felipe es
sedici.creator.person Gull, Theodore. R. es
sedici.creator.person Fernández Lajús, Eduardo Eusebio es
sedici.creator.person Moffat, Anthony F. J. es
sedici.creator.person Hillier, Desmond J. es
sedici.creator.person Weigelt, Gerd es
sedici.creator.person Corcoran, Michael F. es
sedici.subject.materias Ciencias Astronómicas es
sedici.description.fulltext true es
mods.originInfo.place Instituto de Astrofísica de La Plata es
sedici.subtype Articulo es
sedici.rights.license Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)
sedici.rights.uri http://creativecommons.org/licenses/by-nc-sa/4.0/
sedici.description.peerReview peer-review es
sedici.relation.journalTitle The Astrophysical Journal es
sedici.relation.journalVolumeAndIssue vol. 963, no. 2 es


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Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0) Except where otherwise noted, this item's license is described as Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)