Artículo
The inside-out planetary nebula around a born-again star
Guerrero, Martín A.; Fang, Xuan; Miller Bertolami, Marcelo Miguel
; Ramos Larios, Gerardo; Todt, Helge; Alarie, Alexandre; Sabin, Laurence; Miranda, Luis F.; Morisset, Christophe; Kehrig, Carolina; Zavala, Saúl A.
Fecha de publicación:
01/2018
Editorial:
Nature Publishing Group
Revista:
Nature Astronomy
ISSN:
2397-3366
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
Planetary nebulae are ionized clouds of gas formed by the hydrogen-rich envelopes of low- and intermediate-mass stars ejected at late evolutionary stages. The strong UV flux from their central stars causes a highly stratified ionization structure, with species of higher ionization potential closer to the star. Here, we report on the exceptional case of HuBi 1, a double-shell planetary nebula whose inner shell presents emission from low-ionization species close to the star and emission from high-ionization species farther away. Spectral analysis demonstrates that the inner shell of HuBi 1 is excited by shocks, whereas its outer shell is recombining. The anomalous excitation of these shells can be traced to its low-temperature [WC10] central star whose optical brightness has declined continuously by 10 magnitudes in a period of 46 years. Evolutionary models reveal that this star is the descendant of a low-mass star (≃1.1 M⊙) that has experienced a ‘born-again’ event1 whose ejecta shock-excite the inner shell. HuBi 1 represents the missing link in the formation of metal-rich central stars of planetary nebulae from low-mass progenitors, offering unique insight regarding the future evolution of the born-again Sakurai’s object2. Coming from a solar-mass progenitor, HuBi 1 represents a potential end-state for our Sun.
Palabras clave:
Planetary Nebulae
,
Stars
Archivos asociados
Licencia
Identificadores
Colecciones
Articulos(IALP)
Articulos de INST.DE ASTROFISICA LA PLATA
Articulos de INST.DE ASTROFISICA LA PLATA
Citación
Guerrero, Martín A.; Fang, Xuan; Miller Bertolami, Marcelo Miguel; Ramos Larios, Gerardo; Todt, Helge; et al.; The inside-out planetary nebula around a born-again star; Nature Publishing Group; Nature Astronomy; 2; 10; 1-2018; 784-789
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