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THE SOLAR NEIGHBORHOOD. XXX. FOMALHAUT C
The Astronomical journal, 2013-12, Vol.146 (6), p.1-10
[Peer Reviewed Journal]
ISSN: 0004-6256 ;ISSN: 1538-3881 ;EISSN: 1538-3881 ;DOI: 10.1088/0004-6256/146/6/154
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Title:
THE SOLAR NEIGHBORHOOD. XXX. FOMALHAUT C
Author:
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
Subjects:
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
Is Part Of:
The Astronomical journal, 2013-12, Vol.146 (6), p.1-10
Description:
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.
Publisher:
United States
Language:
English
Identifier:
ISSN: 0004-6256
ISSN: 1538-3881
EISSN: 1538-3881
DOI: 10.1088/0004-6256/146/6/154
Source:
Alma/SFX Local Collection
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