| Full text | |
| Author(s): Show less - |
Gull, Theodore R.
[1]
;
Navarete, Felipe
[2]
;
Corcoran, Michael F.
[3, 4, 5]
;
Damineli, Augusto
[2]
;
Espinoza, David
[3, 4]
;
Hamaguchi, Kenji
[6, 3, 4]
;
Hartman, Henrik
[7]
;
Hillier, D. John
[8, 9]
;
Madura, Thomas
[10]
;
Moffat, Anthony F. J.
[11, 12]
;
Morris, Patrick
[13]
;
Nielsen, Krister
[5]
;
Pittard, Julian M.
[14]
;
Pollock, Andrew M. T.
[15]
;
Richardson, Noel D.
[16]
;
Russell, Christopher M. P.
[3, 4, 5]
;
Stevens, Ian R.
[17]
;
Weigelt, Gerd
[18]
Total Authors: 18
|
| Affiliation: Show less - | [1] NASA, Goddard Space Flight Ctr, Exoplanets & Stellar Astrophys Lab, Code 916, Greenbelt, MD 20771 - USA
[2] Univ Sao Paulo, IAG, Rua Matao 1226, Cidade Univ, BR-05508090 Sao Paulo, SP - Brazil
[3] NASA, Goddard Space Flight Ctr, CRESST, Code 916, Greenbelt, MD 20771 - USA
[4] NASA, Goddard Space Flight Ctr, Xray Astrophys Lab, Code 916, Greenbelt, MD 20771 - USA
[5] Catholic Univ Amer, 620 Michigan Ave NE, Washington, DC 20064 - USA
[6] Univ Maryland Baltimore Cty, Dept Phys, 1000 Hilltop Circle, Baltimore, MD 21250 - USA
[7] Malmo Univ, Mat Sci & Appl Math, SE-20506 Malmo - Sweden
[8] Univ Pittsburgh, Dept Phys & Astron, 3941 OHara St, Pittsburgh, PA 15260 - USA
[9] Univ Pittsburgh, Pittsburgh Particle Phys Astrophys & Cosmol Ctr P, 3941 OHara St, Pittsburgh, PA 15260 - USA
[10] San Jose State Univ, Dept Phys & Astron, One Washington Sq, San Jose, CA 95192 - USA
[11] Univ Montreal, Dept Phys, CP 6128, Succ C-V, Montreal, PQ H3C 3J7 - Canada
[12] Ctr Rech Astrophys Quebec, Quebec City, PQ - Canada
[13] CALTECH, IPAC, M-C 100-22, Pasadena, CA 91125 - USA
[14] Univ Leeds, Sch Phys & Astron, Woodhouse Lane, Leeds LS2 9JT, W Yorkshire - England
[15] Univ Sheffield, Dept Phys & Astron, Hounsfield Rd, Sheffield S3 7RH, S Yorkshire - England
[16] Embry Riddle Aeronaut Univ, Dept Phys & Astron, 3700 Willow Creek Rd, Prescott, AZ 86301 - USA
[17] Univ Birmingham, Sch Phys & Astron, Birmingham B15 2TT, W Midlands - England
[18] Max Planck Inst Radio Astron, Hugel 69, D-53121 Bonn - Germany
Total Affiliations: 18
|
| Document type: | Journal article |
| Source: | ASTROPHYSICAL JOURNAL; v. 923, n. 1 DEC 2021. |
| Web of Science Citations: | 0 |
| Abstract | |
Since 2002, the far-ultraviolet (FUV) flux (1150-1680 angstrom) of Eta Carinae, monitored by the Hubble Space Telescope/Space Telescope Imaging Spectrograph, has increased by an order of magnitude. This increase is attributed to partial dissipation of a line-of-sight (LOS) occulter that blocks the central core of the system. Across the 2020 February periastron passage, changes in the FUV emission show a stronger wavelength dependence than occurred across the 2003 July periastron passage. Across both periastron passages, most of the FUV spectrum dropped in flux then recovered a few months later. The 2020 periastron passage included enhancements of FUV flux in narrow spectral intervals near periastron followed by a transient absorption and recovery to pre-periastron flux levels. The drop in flux is due to increased absorption by singly ionized species as the secondary star plunges deep into the wind of the primary star, which blocks the companion's ionizing radiation. The enhanced FUV emission is caused by the companion's wind-blown cavity briefly opening a window to deeper layers of the primary star. This is the first time transient brightening has been seen in the FUV comparable to transients previously seen at longer wavelengths. Changes in resonance line-velocity profiles hint that the dissipating occulter is associated with material in LOS moving at -100 to -300 km s(-1), similar in velocity of structures previously associated with the 1890s lesser eruption. (AU) | |
| FAPESP's process: | 19/02029-2 - Eta Carinae: a perfect periastron passage in 2020 |
| Grantee: | Augusto Damineli Neto |
| Support Opportunities: | Regular Research Grants |
| FAPESP's process: | 17/18191-8 - High-mass star formation: the mass of the central sources and the physics of the accretion process |
| Grantee: | Felipe Donizeti Teston Navarete |
| Support Opportunities: | Scholarships in Brazil - Post-Doctoral |