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• W4313483356 abstract "The binary eta Carinae is the closest example of a very massive star, which may have formed through a merger during its Great Eruption in the mid-nineteenth century. We aimed to confirm and improve the kinematics using a spectroscopic data set taken with the CTIO 1.5 m telescope over the time period of 2008-2020, covering three periastron passages of the highly eccentric orbit. We measure line variability of H-alpha and H-beta, where the radial velocity and orbital kinematics of the primary star were measured from the H-beta emission line using a bisector method. At phases away from periastron, we observed the He II 4686 emission moving opposite the primary star, consistent with a possible Wolf-Rayet companion, although with a seemingly narrow emission line. This could represent the first detection of emission from the companion." @default.
• W4313483356 created "2023-01-06" @default.
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• W4313483356 date "2022-12-30" @default.
• W4313483356 modified "2023-10-18" @default.
• W4313483356 title "The orbital kinematics of eta Carinae over three periastra with a possible detection of the elusive secondary's motion" @default.
• W4313483356 doi "https://doi.org/10.48550/arxiv.2301.00064" @default.
• W4313483356 hasPublicationYear "2022" @default.
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