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THE SOLAR NEIGHBORHOOD. XXX. FOMALHAUT C

MAMAJEK, ERIC E ; Bartlett, Jennifer L ; SEIFAHRT, ANDREAS ; Henry, Todd J ; Dieterich, Sergio B ; Lurie, John C ; Kenworthy, Matthew A ; Jao, Wei-Chun ; RIEDEL, ADRIC R ; Subasavage, John P ; Winters, Jennifer G ; Finch, Charlie T ; Ianna, Philip A ; Bean, Jacob

The Astronomical journal, 2013-12, Vol.146 (6), p.1-10 [Periódico revisado por pares]

United States

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Título:
THE SOLAR NEIGHBORHOOD. XXX. FOMALHAUT C
Autor: MAMAJEK, ERIC E ; Bartlett, Jennifer L ; SEIFAHRT, ANDREAS ; Henry, Todd J ; Dieterich, Sergio B ; Lurie, John C ; Kenworthy, Matthew A ; Jao, Wei-Chun ; RIEDEL, ADRIC R ; Subasavage, John P ; Winters, Jennifer G ; Finch, Charlie T ; Ianna, Philip A ; Bean, Jacob
Assuntos: Age ; APERTURES ; Astrometry ; ASTROPHYSICS, COSMOLOGY AND ASTRONOMY ; DISTANCE ; DWARF STARS ; Dynamical systems ; LIMITING VALUES ; METALLICITY ; Photometry ; PLANETS ; PROBABILITY ; RADIAL VELOCITY ; ROTATION ; SKY ; Space telescopes ; SPECTROSCOPY ; STARS ; STREAMS ; TELESCOPES ; Three dimensional ; THREE-DIMENSIONAL CALCULATIONS
É parte de: The Astronomical journal, 2013-12, Vol.146 (6), p.1-10
Notas: ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
Descrição: LP 876-10 is a nearby active M4 dwarf in Aquarius at a distance of 7.6 pc. The star is a new addition to the 10 pc census, with a parallax measured via the REsearch Consortium On Nearby Stars (RECONS) astrometric survey on the Small and Moderate Aperture Research Telescope System's 0.9 m telescope. We demonstrate that the astrometry, radial velocity, and photometric data for LP 876-10 are consistent with the star being a third bound stellar component to the Fomalhaut multiple system, despite the star lying nearly 6[degrees] away from Fomalhaut A in the sky. The three-dimensional separation of LP 876-10 from Fomalhaut is only 0.77 + or - 0.01 pc, and 0.987 + or - 0.006 pc from TW PsA (Fomalhaut B), well within the estimated tidal radius of the Fomalhaut system (1.9 pc). LP 876- 10 shares the motion of Fomalhaut within ~1 km s super(-1), and we estimate an interloper probability of ~10 super(-5). Neither our echelle spectroscopy nor astrometry are able to confirm the close companion to LP 876-10 reported in the Washington Double Star Catalog (WSI 138). We argue that the Castor Moving Group to which the Fomalhaut system purportedly belongs, is likely to be a dynamical stream, and hence membership to the group does not provide useful age constraints for group members. LP 876-10 (Fomalhaut C) has now risen from obscurity to become a rare example of a field M dwarf with well-constrained age (440 + or - 40 Myr) and metallicity. Besides harboring a debris disk system and candidate planet, Fomalhaut now has two of the widest known stellar companions.
Editor: United States
Idioma: Inglês

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THE SOLAR NEIGHBORHOOD. XXX. FOMALHAUT C

MAMAJEK, ERIC E ; Bartlett, Jennifer L ; SEIFAHRT, ANDREAS ; Henry, Todd J ; Dieterich, Sergio B ; Lurie, John C ; Kenworthy, Matthew A ; Jao, Wei-Chun ; RIEDEL, ADRIC R ; Subasavage, John P ; Winters, Jennifer G ; Finch, Charlie T ; Ianna, Philip A ; Bean, Jacob

United States

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