The spectroscopic orbits and other parameters of the symbiotic binary FN Sgr

We present a study of the eclipsing symbiotic binary FN Sgr with a period of 568.3 days determined photometrically and confirmed spectroscopically. The hot component underwent a 2.5 mag eruption covered by most of our spectroscopic observations. In particular, we have determined for the first time s...

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Autores principales:	Brandi, Estela, Mikolajewska, J., Quiroga, Claudio Hugo Martín, Belczynski, Krzysztof, Ferrer, Osvaldo Eduardo, García, Lía Guillermina, Pereira, C. B.
Formato:	Articulo
Lenguaje:	Español
Publicado:	2005
Materias:	Ciencias Astronómicas Ciencias Exactas Stars: binaries: eclipsing Stars: binaries: symbiotic Stars: fundamental parameters Stars: individual: FN Sgr
Acceso en línea:	http://sedici.unlp.edu.ar/handle/10915/123391
Aporte de:	SEDICI (UNLP) de Universidad Nacional de La Plata

id	I19-R120-10915-123391
record_format	dspace
institution	Universidad Nacional de La Plata
institution_str	I-19
repository_str	R-120
collection	SEDICI (UNLP)
language	Español
topic	Ciencias Astronómicas Ciencias Exactas Stars: binaries: eclipsing Stars: binaries: symbiotic Stars: fundamental parameters Stars: individual: FN Sgr
spellingShingle	Ciencias Astronómicas Ciencias Exactas Stars: binaries: eclipsing Stars: binaries: symbiotic Stars: fundamental parameters Stars: individual: FN Sgr Brandi, Estela Mikolajewska, J. Quiroga, Claudio Hugo Martín Belczynski, Krzysztof Ferrer, Osvaldo Eduardo García, Lía Guillermina Pereira, C. B. The spectroscopic orbits and other parameters of the symbiotic binary FN Sgr
topic_facet	Ciencias Astronómicas Ciencias Exactas Stars: binaries: eclipsing Stars: binaries: symbiotic Stars: fundamental parameters Stars: individual: FN Sgr
description	We present a study of the eclipsing symbiotic binary FN Sgr with a period of 568.3 days determined photometrically and confirmed spectroscopically. The hot component underwent a 2.5 mag eruption covered by most of our spectroscopic observations. In particular, we have determined for the first time spectroscopic orbits based on the radial velocity curves for both components. A set of blue absorption lines resembling an A-F type star is present in all our spectra and they seem to be associated with the hot component. Based on the light curve, we derive the red giant’s radius (140 R <sub>☉</sub>) and the orbital inclination (i = 80◦). We find that FN Sgr is similar to other S-type symbiotic binaries, composed by an M 5-type giant (M <sub>g</sub> = 1.5 M <sub>☉</sub> ) and a hot white dwarf (M <sub>h</sub> = 0.7 M <sub>☉</sub> , R <sub>h</sub> = 0.2 R <sub>☉</sub> ) with a binary separation of ∼1.6 AU. The red giant is just filling its Roche lobe and a geometrically and optically thick accretion disk is likely to be present around the low-mass accretor. The evolution of Th and Lh along the active phase argues in favour of accretion disk instabilities similar to those of Z And. We have also studied spectral changes and photometric variations as a function of both the hot component activity and the orbital motion.
format	Articulo Articulo
author	Brandi, Estela Mikolajewska, J. Quiroga, Claudio Hugo Martín Belczynski, Krzysztof Ferrer, Osvaldo Eduardo García, Lía Guillermina Pereira, C. B.
author_facet	Brandi, Estela Mikolajewska, J. Quiroga, Claudio Hugo Martín Belczynski, Krzysztof Ferrer, Osvaldo Eduardo García, Lía Guillermina Pereira, C. B.
author_sort	Brandi, Estela
title	The spectroscopic orbits and other parameters of the symbiotic binary FN Sgr
title_short	The spectroscopic orbits and other parameters of the symbiotic binary FN Sgr
title_full	The spectroscopic orbits and other parameters of the symbiotic binary FN Sgr
title_fullStr	The spectroscopic orbits and other parameters of the symbiotic binary FN Sgr
title_full_unstemmed	The spectroscopic orbits and other parameters of the symbiotic binary FN Sgr
title_sort	spectroscopic orbits and other parameters of the symbiotic binary fn sgr
publishDate	2005
url	http://sedici.unlp.edu.ar/handle/10915/123391
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The spectroscopic orbits and other parameters of the symbiotic binary FN Sgr

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