Spectral Variations of Of?p Oblique Magnetic Rotator Candidates in the Magellanic Clouds

Walborn, Nolan R.; Morrell, Nidia I.; Nazé, Yaël; Wade, Gregg A.; Bagnulo, Stefano; Barbá, Rodolfo H.; Maíz Apellániz, Jesús; Howarth, Ian D.; Evans, Christopher J.; Sota, Alfredo

doi:10.1088/0004-6256/150/4/99

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Spectral Variations of Of?p Oblique Magnetic Rotator Candidates in the Magellanic Clouds

Walborn, Nolan R.; Morrell, Nidia I.; Nazé, Yaël et al.

2015 • In Astronomical Journal, 150, p. 99

Peer Reviewed verified by ORBi

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https://hdl.handle.net/2268/186870

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10.1088/0004-6256/150/4/99

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Keywords :

Magellanic Clouds; stars: early-type; stars: emission-line; Be; stars: magnetic field; stars: rotation; stars: variables: general

Abstract :

[en] 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.

Disciplines :

Space science, astronomy & astrophysics

Author, co-author :

Walborn, Nolan R.; Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA

Morrell, Nidia I.; Las Campanas Observatory, Carnegie Observatories, Casilla 601, La Serena, Chile

Nazé, Yaël ; Université de Liège - ULiège

Wade, Gregg A.; Department of Physics, Royal Military College of Canada, P.O. Box 17000 Station Forces, Kingston, ON, Canada K7K 7B4, Canada

Bagnulo, Stefano; Armagh Observatory, College Hill, Armagh BT61 9DG, UK

Barbá, Rodolfo H.; Departamento de Física y Astronomía, Universidad de La Serena, Cisternas 1200 Norte, La Serena, Chile

Maíz Apellániz, Jesús; Centro de Astrobiología, CSIC-INTA, Campus ESAC, Apartado Postal 78, E-28691 Villanueva de la Cañada, Madrid, Spain

Howarth, Ian D.; Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, UK

Evans, Christopher J.; UK Astronomy Technology Centre, Royal Observatory Edinburgh, Blackford Hill, Edinburgh EH9 3HJ, UK

Sota, Alfredo; Instituto de Astrofísica de Andalucía—CSIC, Glorieta de la Astronomía s/n, E-18008 Granada, Spain )

Language :

English

Title :

Spectral Variations of Of?p Oblique Magnetic Rotator Candidates in the Magellanic Clouds

Publication date :

01 October 2015

Journal title :

Astronomical Journal

ISSN :

0004-6256

eISSN :

1538-3881

Publisher :

American Astronomical Society, United States

Volume :

150

Pages :

Peer reviewed :

Peer Reviewed verified by ORBi

Additional URL :

http://cdsads.u-strasbg.fr/abs/2015AJ....150...99W

Available on ORBi :

since 16 October 2015

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