The orbital kinematics of η Carinae over three periastra with a possible detection of the elusive secondary’s motion
| Autor: | Emily Strawn, Noel D Richardson, Anthony F J Moffat, Nour Ibrahim, Alexis Lane, Connor Pickett, André-Nicolas Chené, Michael F Corcoran, Augusto Damineli, Theodore R Gull, D John Hillier, Patrick Morris, Herbert Pablo, Joshua D Thomas, Ian R Stevens, Mairan Teodoro, Gerd Weigelt |
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| Jazyk: | angličtina |
| Rok vydání: | 2023 |
| Předmět: | |
| Popis: | 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. Comment: 11 pages, accepted to MNRAS |
| Databáze: | OpenAIRE |
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