| Full text | |
| Author(s): Show less - |
Strawn, Emily
;
Richardson, Noel D.
;
Moffat, Anthony F. J.
;
Ibrahim, Nour
;
Lane, Alexis
;
Pickett, Connor
;
Chene, Andre-Nicolas
;
Corcoran, Michael F.
;
Damineli, Augusto
;
Gull, Theodore R.
;
Hillier, D. John
;
Morris, Patrick
;
Pablo, Herbert
;
Thomas, Joshua D.
;
Stevens, Ian R.
;
Teodoro, Mairan
;
Weigelt, Gerd
Total Authors: 17
|
| Document type: | Journal article |
| Source: | Monthly Notices of the Royal Astronomical Society; v. 519, n. 4, p. 11-pg., 2023-03-01. |
| 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-19th century. We aimed to confirm and improve the kinematics using a spectroscopic data set taken with the Cerro Tololo Inter-American Observatory 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. (AU) | |
| FAPESP's process: | 11/51680-6 - Exploring the universe: from the galaxies formation to Earth-like planets with the Giant Magellan Telescope |
| Grantee: | Laerte Sodré Junior |
| Support Opportunities: | Special Projects |
| FAPESP's process: | 19/02029-2 - Eta Carinae: a perfect periastron passage in 2020 |
| Grantee: | Augusto Damineli Neto |
| Support Opportunities: | Regular Research Grants |