Changes in the Na D1 Absorption Components of η Carinae Provide Clues on the Location of the Dissipating Central Occulter

@article{Pickett2022ChangesIT,
  title={Changes in the Na D1 Absorption Components of $\eta$ Carinae Provide Clues on the Location of the Dissipating Central Occulter},
  author={Connor S. Pickett and Noel D. Richardson and Theodore Gull and D. John Hillier and Henrik Hartman and Nour Ibrahim and Alexis Lane and Emily Strawn and Augusto Damineli and Anthony F. J. Moffat and Felipe Navarete and Gerd Weigelt},
  journal={The Astrophysical Journal},
  year={2022},
  volume={937}
}
The Na D absorption doublet in the spectrum of η Carinae is complex, with multiple absorption features associated with the Great Eruption (1840s), the Lesser Eruption (1890s), and the interstellar clouds. The velocity profile is further complicated by the P Cygni profile originating in the system’s stellar winds and blending with the He i λ5876 profile. The Na D profile contains a multitude of absorption components, including those at velocities of −145 km s−1, −168 km s−1, and +87 km s−1… 

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