A spectroscopic, photometric, polarimetric, and radio study of the eclipsing polar UZ Fornacis: the first simultaneous SALT and MeerKAT observations-Reference-Cited by-同舟云学术

A spectroscopic, photometric, polarimetric, and radio study of the eclipsing polar UZ Fornacis: the first simultaneous SALT and MeerKAT observations

Published:2020-01-11 Issue:3 Volume:492 Page:4298-4312
ISSN:0035-8711
Container-title:Monthly Notices of the Royal Astronomical Society
language:en
Short-container-title:

Author:

Khangale Z N¹²^ORCID,Potter S B¹^ORCID,Woudt P A²,Buckley D A H¹³^ORCID,Semena A N⁴,Kotze E J¹³,Groenewald D N¹³^ORCID,Hewitt D M¹²,Pretorius M L¹,Fender R P²⁵,Groot P¹²⁶,Bloemen S⁶,Klein-Wolt M⁶,Körding E⁶,Le Poole R⁷,McBride V A¹²⁸,Townsend L²^ORCID,Paterson K⁹,Pieterse D L A⁶,Vreeswijk P⁶

Affiliation:

1. South African Astronomical Observatory, Observatory Road, Observatory, 7925, Cape Town, South Africa

2. Inter-University Institute for Data-Intensive Astronomy, Department of Astronomy, University of Cape Town, Private Bag X3, Rondebosch 7701, South Africa

3. Southern African Large Telescope, Observatory Road, Observatory, 7925, Cape Town, South Africa

4. Space Research Institute, Russian Academy of Sciences, Profsoyuznaya 84/32, 117997, Moscow, Russia

5. Astrophysics, Department of Physics, University of Oxford, Keble Road, Oxford OX1 3RH, UK

6. Department of Astrophysics/IMAPP, Radboud University Nijmegen, PO Box 9010, NL-6500 GL Nijmegen, the Netherlands

7. Leiden Observatory, Leiden University, PO Box 9513, NL-2300 RA Leiden, the Netherlands

8. IAU-Office of Astronomy for Development, PO Box 9, 7935 Observatory, South Africa

9. Center for Interdisciplinary Exploration and Research in Astrophysics (CIERA), Northwestern University, 1800 Sherman Ave, Evanston, IL 60201, USA

Abstract

ABSTRACT We present phase-resolved spectroscopy, photometry, and circular spectropolarimetry of the eclipsing polar UZ Fornacis. Doppler tomography of the strongest emission lines using the inside-out projection revealed the presence of three emission regions: from the irradiated face of the secondary star, the ballistic stream and the threading region, and the magnetically confined accretion stream. The total intensity spectrum shows broad emission features and a continuum that rises in the blue. The circularly polarized spectrum shows the presence of three cyclotron emission harmonics at ∼4500, 6000, and 7700 Å, corresponding to harmonic numbers 4, 3, and 2, respectively. These features are dominant before the eclipse and disappear after the eclipse. The harmonics are consistent with a magnetic field strength of ∼57 MG. We also present phase-resolved circular and linear photopolarimetry to complement the spectropolarimetry around the times of eclipse. MeerKAT radio observations show a faint source that has a peak flux density of 30.7 ± 5.4 $\mu$Jy beam−1 at 1.28 GHz at the position of UZ For.

Funder

National Research Foundation

University of Capetown

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/staa080/31798244/staa080.pdf

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