Artículo
Raman-scattered O VI Features in the Symbiotic Nova RR Telescopii
Fecha de publicación:
07/2021
Editorial:
IOP Publishing
Revista:
Astrophysical Journal
ISSN:
0004-637X
e-ISSN:
1538-4357
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
RR Tel is an interacting binary system in which a hot white dwarf (WD) accretes matter from a Mira-type variable star via gravitational capture of its stellar wind. This symbiotic nova shows intense Raman-scattered O VI 1032 and 1038 features at 6825 ˚A and 7082 ˚A. We present high-resolution optical spectra of RR Tel taken in 2016 and 2017 with the Magellan Inamori Kyocera Echelle (MIKE) spectrograph at Magellan-Clay telescope, Chile. We aim to study the stellar wind accretion in RR Tel from the profile analysis of Raman O VI features. With an asymmetric O VI disk model, we derive a representative Keplerian speed of > 35 km s−1 , and the corresponding scale < 0.8 au. The best-fit for the Raman profiles is obtained with a mass loss rate of the Mira M˙ ∼ 2 × 10−6 M yr−1 and a wind terminal velocity v∞ ∼ 20 km s−1 . We compare the MIKE data with an archival spectrum taken in 2003 with the Fibre-fed Extended Range Optical Spectrograph (FEROS) at the MPG/ESO 2.2 m telescope. It allows us to highlight the profile variation of the Raman O VI features, indicative of a change in the density distribution of the O VI disk in the last two decades. We also report the detection of O VI recombination lines at 3811 ˚A and 3834 ˚A, which are blended with other emission lines. Our profile decomposition suggests that the recombination of O VII takes place nearer to the WD than the O VI 1032 and 1038 emission region.
Palabras clave:
SYMBIOTIC STARS
,
RADIATIVE TRANSFER
,
SCATTERING
Archivos asociados
Licencia
Identificadores
Colecciones
Articulos(CCT - CORDOBA)
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - CORDOBA
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - CORDOBA
Citación
Heo, J. E.; Lee, H. W.; Angeloni, R.; Palma, Tali; Di Mille, F.; Raman-scattered O VI Features in the Symbiotic Nova RR Telescopii; IOP Publishing; Astrophysical Journal; 915; 2; 7-2021; 105-115
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