Further Results from the Galactic O-Star Spectroscopic Survey: Rapidly Rotating Late ON Giants

With new data from the Galactic O-Star Spectroscopic Survey, we confirm and expand the ONn category of late-O, nitrogen-enriched (N), rapidly rotating (n) giants. In particular, we have discovered two "clones" (HD 102415 and HD 117490) of one of the most rapidly rotating O stars previously...

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Detalles Bibliográficos
Autores principales: Walborn, Nolan Revere, Maíz Apellániz, Jesús, Sota, Alfredo, Alfaro, Emilio J., Morrell, Nidia Irene, Barbá, Rodolfo Héctor, Arias, Julia Inés, Gamen, Roberto Claudio
Formato: Articulo
Lenguaje:Inglés
Publicado: 2011
Materias:
Ciencias Astronómicas
stars: abundances
stars: early-type
stars: evolution
stars: fundamental parameters
stars: rotation
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/131381
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-131381
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
stars: abundances
stars: early-type
stars: evolution
stars: fundamental parameters
stars: rotation
spellingShingle Ciencias Astronómicas
stars: abundances
stars: early-type
stars: evolution
stars: fundamental parameters
stars: rotation
Walborn, Nolan Revere
Maíz Apellániz, Jesús
Sota, Alfredo
Alfaro, Emilio J.
Morrell, Nidia Irene
Barbá, Rodolfo Héctor
Arias, Julia Inés
Gamen, Roberto Claudio
Further Results from the Galactic O-Star Spectroscopic Survey: Rapidly Rotating Late ON Giants
topic_facet Ciencias Astronómicas
stars: abundances
stars: early-type
stars: evolution
stars: fundamental parameters
stars: rotation
description With new data from the Galactic O-Star Spectroscopic Survey, we confirm and expand the ONn category of late-O, nitrogen-enriched (N), rapidly rotating (n) giants. In particular, we have discovered two "clones" (HD 102415 and HD 117490) of one of the most rapidly rotating O stars previously known (HD 191423, "Howarth's Star"). We compare the locations of these objects in the theoretical HR Diagram to those of slowly rotating ON dwarfs and supergiants. All ON giants known to date are rapid rotators, whereas no ON dwarf or supergiant is; but all ON stars are small fractions of their respective spectral-type/luminosity-class/rotational subcategories. The ONn giants, displaying both substantial processed material and high rotation at an intermediate evolutionary stage, may provide significant information about the development of those properties. They may have preserved high initial rotational velocities or been spun up by TAMS core contraction; but alternatively and perhaps more likely, they may be products of binary mass transfer. At least some of them are also runaway stars.
format Articulo
Articulo
author Walborn, Nolan Revere
Maíz Apellániz, Jesús
Sota, Alfredo
Alfaro, Emilio J.
Morrell, Nidia Irene
Barbá, Rodolfo Héctor
Arias, Julia Inés
Gamen, Roberto Claudio
author_facet Walborn, Nolan Revere
Maíz Apellániz, Jesús
Sota, Alfredo
Alfaro, Emilio J.
Morrell, Nidia Irene
Barbá, Rodolfo Héctor
Arias, Julia Inés
Gamen, Roberto Claudio
author_sort Walborn, Nolan Revere
title Further Results from the Galactic O-Star Spectroscopic Survey: Rapidly Rotating Late ON Giants
title_short Further Results from the Galactic O-Star Spectroscopic Survey: Rapidly Rotating Late ON Giants
title_full Further Results from the Galactic O-Star Spectroscopic Survey: Rapidly Rotating Late ON Giants
title_fullStr Further Results from the Galactic O-Star Spectroscopic Survey: Rapidly Rotating Late ON Giants
title_full_unstemmed Further Results from the Galactic O-Star Spectroscopic Survey: Rapidly Rotating Late ON Giants
title_sort further results from the galactic o-star spectroscopic survey: rapidly rotating late on giants
publishDate 2011
url http://sedici.unlp.edu.ar/handle/10915/131381
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