New observations of NGC 1624−2 reveal a complex magnetospheric structure and underlying surface magnetic geometry-Reference-Cited by-同舟云学术

New observations of NGC 1624−2 reveal a complex magnetospheric structure and underlying surface magnetic geometry

Published:2020-12-14 Issue:2 Volume:501 Page:2677-2687
ISSN:0035-8711
Container-title:Monthly Notices of the Royal Astronomical Society
language:en
Short-container-title:

Author:

David-Uraz A¹²³^ORCID,Petit V¹⁴^ORCID,Shultz M E¹,Fullerton A W⁵,Erba C¹,Keszthelyi Z⁶^ORCID,Seadrow S¹,Wade G A⁷

Affiliation:

1. Department of Physics and Astronomy, University of Delaware, Newark, DE 19716, USA

2. Department of Physics and Astronomy, Howard University, Washington, DC 20059, USA

3. Center for Research and Exploration in Space Science and Technology, and X-ray Astrophysics Laboratory, NASA/GSFC, Greenbelt, MD 20771, USA

4. Bartol Research Institute, University of Delaware, Newark, DE 19716, USA

5. Space Telescope Science Institute, Baltimore, MD 21218, USA

6. Anton Pannekoek Institute for Astronomy, University of Amsterdam, Science Park 904, NL-1098 XH Amsterdam, the Netherlands

7. Department of Physics and Space Science, Royal Military College of Canada, PO Box 17000, Stn Forces, Kingston, ON K7K 7B4, Canada

Abstract

ABSTRACT NGC 1624−2 is the most strongly magnetized O-type star known. Previous spectroscopic observations of this object in the ultraviolet provided evidence that it hosts a large and dense circumstellar magnetosphere. Follow-up observations obtained with the Hubble Space Telescope not only confirm that previous inference, but also suggest that NGC 1624−2’s magnetosphere has a complex structure. Furthermore, an expanded spectropolarimetric time series shows a potential departure from a dipolar magnetic field geometry, which could mean that the strongest field detected at the surface of an O-type star is also topologically complex. This result raises important questions regarding the origin and evolution of magnetic fields in massive stars.

Funder

National Aeronautics and Space Administration

Space Telescope Science Institute

Publisher

Oxford University Press (OUP)

Subject

Space and Planetary Science,Astronomy and Astrophysics

Link

http://academic.oup.com/mnras/advance-article-pdf/doi/10.1093/mnras/staa3768/34899636/staa3768.pdf

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