2013A&A...558A..71L


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.04CEST01:25:44

2013A&A...558A..71L - Astronomy and Astrophysics, volume 558A, 71-71 (2013/10-1)

One, two, or three stars? an investigation of an unusual eclipsing binary candidate undergoing dramatic period changes.

LOHR M.E., NORTON A.J., KOLB U.C. and BOYD D.R.S.

Abstract (from CDS):

We report our investigation of 1SWASP J234401.81-212229.1, a variable with a 18461.6s period. After identification in a 2011 search of the SuperWASP archive for main-sequence eclipsing binary candidates near the distribution's short-period limit of ∼0.20d, it was measured to be undergoing rapid period decrease in our earlier work, though later observations supported a cyclic variation in period length. Spectroscopic data obtained in 2012 with the Southern African Large Telescope did not, however, support the interpretation of the object as a normal eclipsing binary. Here, we consider three possible explanations consistent with the data: a single-star oblique rotator model in which variability results from stable cool spots on opposite magnetic poles; a two-star model in which the secondary is a brown dwarf; and a three-star model involving a low-mass eclipsing binary in a hierarchical triple system. We conclude that the latter is the most likely model.

Abstract Copyright:

Journal keyword(s): stars: individual: 1SWASP J234401.81-212229.1 - stars: variables: general - binaries: close - binaries: eclipsing

VizieR on-line data: <Available at CDS (J/A+A/558/A71): minima.dat>

Simbad objects: 7

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Number of rows : 7

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 1SWASP J150822.80-054236.9 EB* 15 08 22.7872307298 -05 42 36.897036423     12.45 12.306   ~ 9 0
2 1SWASP J160156.04+202821.6 EB* 16 01 56.0393215017 +20 28 21.535317171     13.81     ~ 15 0
3 GSC 06410-00829 * 23 43 51.0621359009 -21 18 40.524082422   12.81 12.15 12.23   ~ 2 0
4 GSC 06410-00871 * 23 43 54.6183596867 -21 26 29.123660524   14.56 13.80 13.91   ~ 1 0
5 StKM 1-2148 EB* 23 44 01.8128649515 -21 22 29.080880031   12.84 11.70 11.50   K4 14 0
6 1SWASP J234403.11-212205.8 V* 23 44 03.11 -21 22 05.8           ~ 1 0
7 GSC 06410-01027 * 23 44 21.3780860849 -21 20 44.482326325   13.62 12.99 13.08   ~ 1 0

    Equat.    Gal    SGal    Ecl

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2020.07.04-01:25:44

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