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Title: SPECTRAL VARIATIONS OF Of?p OBLIQUE MAGNETIC ROTATOR CANDIDATES IN THE MAGELLANIC CLOUDS

Optical spectroscopic monitoring has been conducted of two O stars in the SMC and one in the LMC, the spectral characteristics of which place them in the Of?p category, which has been established in the Galaxy to consist of oblique magnetic rotators. All of these Magellanic stars show systematic spectral variations typical of the Of?p class, further strengthening their magnetic candidacy to the point of virtual certainty. The spectral variations are related to photometric variations derived from Optical Gravitational Lensing Experiment data by Nazé et al. in a parallel study, which yields rotational periods for two of them. Now circular spectropolarimetry is required to measure their fields, and ultraviolet spectroscopy to further characterize their low-metallicity, magnetically confined winds, in support of hydrodynamical analyses.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [5] ;  [6] ;  [7] ;  [8] ;  [9] ;  [10]
  1. Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218 (United States)
  2. Las Campanas Observatory, Carnegie Observatories, Casilla 601, La Serena (Chile)
  3. GAPHE, Département AGO, Université de Liège, Allée du 6 Août 19c, Bat. B5C, B-4000-Liège (Belgium)
  4. Department of Physics, Royal Military College of Canada, P.O. Box 17000 Station Forces, Kingston, ON, Canada K7K 7B4 (Canada)
  5. Armagh Observatory, College Hill, Armagh BT61 9DG (United Kingdom)
  6. Departamento de Física y Astronomía, Universidad de La Serena, Cisternas 1200 Norte, La Serena (Chile)
  7. Centro de Astrobiología, CSIC-INTA, Campus ESAC, Apartado Postal 78, E-28691 Villanueva de la Cañada, Madrid (Spain)
  8. Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT (United Kingdom)
  9. UK Astronomy Technology Centre, Royal Observatory Edinburgh, Blackford Hill, Edinburgh EH9 3HJ (United Kingdom)
  10. Instituto de Astrofísica de Andalucía—CSIC, Glorieta de la Astronomía s/n, E-18008 Granada (Spain)
Publication Date:
OSTI Identifier:
22520140
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astronomical Journal (Online); Journal Volume: 150; Journal Issue: 4; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; GRAVITATIONAL LENSES; INTERSTELLAR MAGNETIC FIELDS; MAGELLANIC CLOUDS; METALLICITY; ROTATION; STARS; STELLAR WINDS; ULTRAVIOLET RADIATION; VARIATIONS; X-RAY EMISSION SPECTROSCOPY