| Full text | |
| Author(s): |
Munoz, M. S.
[1]
;
Wade, G. A.
[1, 2]
;
Faes, D. M.
[3]
;
Carciofi, A. C.
[4]
;
Labadie-Bartz, J.
[4]
Total Authors: 5
|
| Affiliation: | [1] Queens Univ, Dept Phys Engn Phys & Astron, 64 Bader Lane, Kingston, ON K7L 3N6 - Canada
[2] Royal Mil Coll Canada, Dept Phys & Space Sci, 13 Gen Crerar Crescent, Kingston, ON K7K 7B4 - Canada
[3] NSFs NOIRLab, Gemini Observ, 670 N Aohoku Pl, Hilo, HI 96720 - USA
[4] Univ Sao Paulo, Inst Astron, Rua Matao 1226, BR-05508900 Sao Paulo - Brazil
Total Affiliations: 4
|
| Document type: | Journal article |
| Source: | Monthly Notices of the Royal Astronomical Society; v. 511, n. 3, p. 3228-3249, FEB 18 2022. |
| Web of Science Citations: | 0 |
| Abstract | |
Light scattered off particles can become linearly polarized. Stars surrounded by oblique, co-rotating envelopes are therefore expected to manifest periodic linear polarimetric variations. The electron scattering magnetospheres of magnetic massive stars are expected to be suitable candidates to observe this effect. In this paper, we present the first semi-analytical model capable of synthesizing the continuum polarimetric signatures of magnetic O-type stars in an optically thin, single electron scattering limit. The purpose of this investigation is to improve our general understanding of magnetic hot stars by characterizing their polarimetric behaviour. Our linear polarization model is constructed by combining the analytical expressions for the polarimetric variations of an obliquely rotating envelope with the analytic dynamical magnetosphere model to represent a physical model for the envelope density structure. We compute grids of model Stokes Q and U curves and show that their shapes are unique to the choice of inclination and obliquity angles. We apply our model to HD 191612, a prototypical Of?p-type star, having both polarimetric and photometric observations. We find that the polarimetric modulations are best reproduced with i = 19(-3)(+12) degrees, beta= 71(-9)(+3) degrees, and log (M) over dot (B=0) = -6.11(-0.06)(+0.12) {[}M-circle dot yr(-1)]. These results agree with previous investigations of this star. By combining both polarimetric and photometric synthesis tools, we simultaneously model the observations thus adding further refinement of the wind and magnetic properties of HD 191612. (AU) | |
| FAPESP's process: | 17/23731-1 - Analysis and Modeling of a Large Sample of Galactic Be Stars |
| Grantee: | Jonathan Michael Labadie-Bartz |
| Support Opportunities: | Scholarships in Brazil - Post-Doctoral |
| FAPESP's process: | 19/13354-1 - Decretion disks and outflows around fast-spinning stars |
| Grantee: | Alex Cavaliéri Carciofi |
| Support Opportunities: | Regular Research Grants |
| FAPESP's process: | 18/04055-8 - High precision spectroscopy: from the first stars to planets |
| Grantee: | Jorge Luis Melendez Moreno |
| Support Opportunities: | Research Projects - Thematic Grants |