SDSS J001641-000925: The first stable red dwarf contact binary with a close-in stellar companion

SDSS J001641-000925 is the first red dwarf contact binary star with an orbital period of 0.19856 days that is one of the shortest known periods among M-dwarf binary systems. The orbital period was detected to be decreasing rapidly at a rate of P ∼ 8 s yr<SUP>-1</SUP>. This indicated that...

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Detalles Bibliográficos
Autores principales: Qian, S. B., Jiang, L. Q., Fernández Lajús, Eduardo, Soonthornthum, B., Zhu, L. Y., Zhao, E. G., He, J. J., Liao, W. P., Wang, J. J., Liu, L., Rattanasoon, S., Aukkaravittayapun, S., Zhou, X., Liu, N. P.
Formato: Articulo
Lenguaje:Inglés
Publicado: 2015
Materias:
Ciencias Astronómicas
binaries: close
binaries: eclipsing
stars: evolution
stars: individual (SDSS J001641-000925)
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/86141
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-86141
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
binaries: close
binaries: eclipsing
stars: evolution
stars: individual (SDSS J001641-000925)
spellingShingle Ciencias Astronómicas
binaries: close
binaries: eclipsing
stars: evolution
stars: individual (SDSS J001641-000925)
Qian, S. B.
Jiang, L. Q.
Fernández Lajús, Eduardo
Soonthornthum, B.
Zhu, L. Y.
Zhao, E. G.
He, J. J.
Liao, W. P.
Wang, J. J.
Liu, L.
Rattanasoon, S.
Aukkaravittayapun, S.
Zhou, X.
Liu, N. P.
SDSS J001641-000925: The first stable red dwarf contact binary with a close-in stellar companion
topic_facet Ciencias Astronómicas
binaries: close
binaries: eclipsing
stars: evolution
stars: individual (SDSS J001641-000925)
description SDSS J001641-000925 is the first red dwarf contact binary star with an orbital period of 0.19856 days that is one of the shortest known periods among M-dwarf binary systems. The orbital period was detected to be decreasing rapidly at a rate of P ∼ 8 s yr<SUP>-1</SUP>. This indicated that SDSS J001641-000925 was undergoing coalescence via a dynamical mass transfer or loss and thus this red dwarf contact binary is dynamically unstable. To understand the properties of the period change, we monitored the binary system photometrically from 2011 September 2 to 2014 October 1 by using several telescopes in the world and 25 eclipse times were determined. It is discovered that the rapid decrease of the orbital period is not true. This is contrary to the prediction that the system is merging driven by rapid mass transfer or loss. Our preliminary analysis suggests that the observed minus calculated (O-C) diagram shows a cyclic oscillation with an amplitude of 0.00255 days and a period of 5.7 yr. The cyclic variation can be explained by the light travel time effect via the presence of a cool stellar companion with a mass of M<SUB>3</SUB> sin i′ ∼ 0.14 M⊙. The orbital separation between the third body and the central binary is about 2.8AU. These results reveal that the rarity of red dwarf contact binaries could not be explained by rapidly dynamical destruction and the presence of the third body helps to form the red dwarf contact binary.
format Articulo
Articulo
author Qian, S. B.
Jiang, L. Q.
Fernández Lajús, Eduardo
Soonthornthum, B.
Zhu, L. Y.
Zhao, E. G.
He, J. J.
Liao, W. P.
Wang, J. J.
Liu, L.
Rattanasoon, S.
Aukkaravittayapun, S.
Zhou, X.
Liu, N. P.
author_facet Qian, S. B.
Jiang, L. Q.
Fernández Lajús, Eduardo
Soonthornthum, B.
Zhu, L. Y.
Zhao, E. G.
He, J. J.
Liao, W. P.
Wang, J. J.
Liu, L.
Rattanasoon, S.
Aukkaravittayapun, S.
Zhou, X.
Liu, N. P.
author_sort Qian, S. B.
title SDSS J001641-000925: The first stable red dwarf contact binary with a close-in stellar companion
title_short SDSS J001641-000925: The first stable red dwarf contact binary with a close-in stellar companion
title_full SDSS J001641-000925: The first stable red dwarf contact binary with a close-in stellar companion
title_fullStr SDSS J001641-000925: The first stable red dwarf contact binary with a close-in stellar companion
title_full_unstemmed SDSS J001641-000925: The first stable red dwarf contact binary with a close-in stellar companion
title_sort sdss j001641-000925: the first stable red dwarf contact binary with a close-in stellar companion
publishDate 2015
url http://sedici.unlp.edu.ar/handle/10915/86141
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