The Onfp class in the Magellanic Clouds

The Onfp class of rotationally broadened, hot spectra was defined some time ago in the Galaxy, where its membership to date numbers only eight. The principal defining characteristic is a broad, centrally reversed He II λ 4686 emission profile; other emission and absorption lines are also rotationall...

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Autores principales:	Walborn, Nolan Revere, Howarth, Ian D., Evans, Christopher J., Crowther, Paul A., Moffat, Anthony F. J., St-Louis, Nicole, Fariña, Cecilia, Bosch, Guillermo Luis, Morrell, Nidia Irene, Barbá, Rodolfo Héctor, Loon, Jacco T. van
Formato:	Articulo
Lenguaje:	Inglés
Publicado:	2010
Materias:	Ciencias Astronómicas Magellanic Clouds Stars: early-type Stars: emission-line, Be Stars: fundamental parameters Stars: rotation Stars: variables: general
Acceso en línea:	http://sedici.unlp.edu.ar/handle/10915/82516
Aporte de:	SEDICI (UNLP) de Universidad Nacional de La Plata

id	I19-R120-10915-82516
record_format	dspace
institution	Universidad Nacional de La Plata
institution_str	I-19
repository_str	R-120
collection	SEDICI (UNLP)
language	Inglés
topic	Ciencias Astronómicas Magellanic Clouds Stars: early-type Stars: emission-line, Be Stars: fundamental parameters Stars: rotation Stars: variables: general
spellingShingle	Ciencias Astronómicas Magellanic Clouds Stars: early-type Stars: emission-line, Be Stars: fundamental parameters Stars: rotation Stars: variables: general Walborn, Nolan Revere Howarth, Ian D. Evans, Christopher J. Crowther, Paul A. Moffat, Anthony F. J. St-Louis, Nicole Fariña, Cecilia Bosch, Guillermo Luis Morrell, Nidia Irene Barbá, Rodolfo Héctor Loon, Jacco T. van The Onfp class in the Magellanic Clouds
topic_facet	Ciencias Astronómicas Magellanic Clouds Stars: early-type Stars: emission-line, Be Stars: fundamental parameters Stars: rotation Stars: variables: general
description	The Onfp class of rotationally broadened, hot spectra was defined some time ago in the Galaxy, where its membership to date numbers only eight. The principal defining characteristic is a broad, centrally reversed He II λ 4686 emission profile; other emission and absorption lines are also rotationally broadened. Recent surveys in the Magellanic Clouds (MCs) have brought the class membership there, including some related spectra, to 28. We present a survey of the spectral morphology and rotational velocities, as a first step toward elucidating the nature of this class. Evolved, rapidly rotating hot stars are not expected theoretically, because the stellar winds should brake the rotation. Luminosity classification of these spectra is not possible, because the principal criterion (He II λ4686) is peculiar; however, the MCs provide reliable absolute magnitudes, which show that they span the entire range from dwarfs to supergiants. The Onfp line-broadening distribution is distinct and shifted toward larger values from those of normal O dwarfs and supergiants with >99.99% confidence. All cases with multiple observations show line-profile variations, which even remove some objects from the class temporarily. Some of them are spectroscopic binaries; it is possible that the peculiar profiles may have multiple causes among different objects. The origin and future of these stars are intriguing; for instance, they could be stellar mergers and/or gamma-ray-burst progenitors.
format	Articulo Articulo
author	Walborn, Nolan Revere Howarth, Ian D. Evans, Christopher J. Crowther, Paul A. Moffat, Anthony F. J. St-Louis, Nicole Fariña, Cecilia Bosch, Guillermo Luis Morrell, Nidia Irene Barbá, Rodolfo Héctor Loon, Jacco T. van
author_facet	Walborn, Nolan Revere Howarth, Ian D. Evans, Christopher J. Crowther, Paul A. Moffat, Anthony F. J. St-Louis, Nicole Fariña, Cecilia Bosch, Guillermo Luis Morrell, Nidia Irene Barbá, Rodolfo Héctor Loon, Jacco T. van
author_sort	Walborn, Nolan Revere
title	The Onfp class in the Magellanic Clouds
title_short	The Onfp class in the Magellanic Clouds
title_full	The Onfp class in the Magellanic Clouds
title_fullStr	The Onfp class in the Magellanic Clouds
title_full_unstemmed	The Onfp class in the Magellanic Clouds
title_sort	onfp class in the magellanic clouds
publishDate	2010
url	http://sedici.unlp.edu.ar/handle/10915/82516
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The Onfp class in the Magellanic Clouds

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