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Artículo

Further results from the galactic O-Star Spectroscopic Survey: rapidly rotating late ON giants

Walborn, Nolan R.; Maíz Apellániz, Jesús; Sota, Alfredo; Alfaro, Emilio J.; Morrell, Nidia I.; Barba, Rodolfo HectorIcon ; Arias, Julia InesIcon ; Gamen, Roberto ClaudioIcon
Fecha de publicación: 11/2011
Editorial: Iop Publishing
Revista: Astrophysical Journal
ISSN: 0004-637X
Idioma: Inglés
Tipo de recurso: Artículo publicado
Clasificación temática:
Astronomía

Resumen

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 H-R 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 these properties. They may have preserved high initial rotational velocities or may have been spun up by terminal-age main-sequence core contraction; alternatively, and perhaps more likely, they may be products of binary mass transfer. At least some of them are also runaway stars.
Palabras clave: Abundances of Stars , Early Type Stars , Evolution of Stars , Fundamental Parameters of Stars
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info:eu-repo/semantics/openAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Unported (CC BY-NC-SA 2.5)
Identificadores
URI: http://hdl.handle.net/11336/10068
DOI: http://dx.doi.org/10.1088/0004-6256/142/5/150
URL: http://iopscience.iop.org/article/10.1088/0004-6256/142/5/150/meta
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Articulos de INST.DE ASTROFISICA LA PLATA
Citación
Walborn, Nolan R.; Maíz Apellániz, Jesús; Sota, Alfredo; Alfaro, Emilio J.; Morrell, Nidia I.; et al.; Further results from the galactic O-Star Spectroscopic Survey: rapidly rotating late ON giants; Iop Publishing; Astrophysical Journal; 142; 5; 11-2011; 150-156
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