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| Main Authors: | , , , , , , , |
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| Format: | Preprint |
| Published: |
2024
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2403.13954 |
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| _version_ | 1866909144543395840 |
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| author | Gull, Theodore R. Hartman, Henrik Corcoran, Michael F. Damineli, Augusto Madura, Thomas Moffat, Anthony F. J. Richardson, Noel D. Weigelt, Gerd |
| author_facet | Gull, Theodore R. Hartman, Henrik Corcoran, Michael F. Damineli, Augusto Madura, Thomas Moffat, Anthony F. J. Richardson, Noel D. Weigelt, Gerd |
| contents | Eta Carinae underwent the Great Eruption in the 1840s and a Lesser Eruption in the 1890s. Its apparent spectrum, modified by intervening ejecta, the Homunculus and Little Homunculus, continues to evolve but contains information pertaining to events in the 19th century. The LOS spectrum contains narrow absorption velocities, from -122 to -1665 km/s: rungs of a broken ladder caused by shells formed by the interacting winds. Estimated shell origin dates correlate with origin dates of expanding emission structures preceding the Great Eruption. The LOS absorption velocities extend the record post Great Eruption to the Lesser Eruption. We suggest that these shells originated from a binary merger within a triple system. Shells formed not only from periastron passages of the current secondary, but also from ear-like extensions preceding and following the periastron event. Additional models need to be considered. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2403_13954 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Eta Carinae left a curious ladder to climb Gull, Theodore R. Hartman, Henrik Corcoran, Michael F. Damineli, Augusto Madura, Thomas Moffat, Anthony F. J. Richardson, Noel D. Weigelt, Gerd Solar and Stellar Astrophysics Eta Carinae underwent the Great Eruption in the 1840s and a Lesser Eruption in the 1890s. Its apparent spectrum, modified by intervening ejecta, the Homunculus and Little Homunculus, continues to evolve but contains information pertaining to events in the 19th century. The LOS spectrum contains narrow absorption velocities, from -122 to -1665 km/s: rungs of a broken ladder caused by shells formed by the interacting winds. Estimated shell origin dates correlate with origin dates of expanding emission structures preceding the Great Eruption. The LOS absorption velocities extend the record post Great Eruption to the Lesser Eruption. We suggest that these shells originated from a binary merger within a triple system. Shells formed not only from periastron passages of the current secondary, but also from ear-like extensions preceding and following the periastron event. Additional models need to be considered. |
| title | Eta Carinae left a curious ladder to climb |
| topic | Solar and Stellar Astrophysics |
| url | https://arxiv.org/abs/2403.13954 |