2014A&A...567A..64H


C.D.S. - SIMBAD4 rel 1.7 - 2020.08.08CEST19:46:17

2014A&A...567A..64H - Astronomy and Astrophysics, volume 567A, 64-64 (2014/7-1)

Orbital and physical parameters of eclipsing binaries from the All-Sky Automated Survey catalogue. VI. AK Fornacis: a rare, bright K-type eclipsing binary.

HELMINIAK K.G., BRAHM R., RATAJCZAK M., ESPINOZA N., JORDAN A., KONACKI M. and RABUS M.

Abstract (from CDS):

We present the results of the combined photometric and spectroscopic analysis of a bright (V=9.14), close (d=31pc), late-type detached eclipsing binary, AK Fornacis. This P=3.981 d system has not been previously recognised as a double-lined spectroscopic binary, and this is the first full physical model of this unique target. With the FEROS, CORALIE, and HARPS spectrographs, we collected a number of high-resolution spectra to calculate radial velocities of both components of the binary. Measurements were done with our own disentangling procedure and the TODCOR technique, and were later combined with the photometry from the ASAS and SuperWASP archives. We also performed an atmospheric analysis of the component spectra with the Spectroscopy Made Easy package. Our analysis shows that AK For consists of two active, cool dwarfs having masses of M1=0.6958±0.0010 and M2=0.6355±0.0007M and radii of R1=0.687±0.020 and R2=0.609±0.016R, respectively, which are slightly less metal-abundant than the Sun. Parameters of both components are well reproduced by the models. AK For is the brightest system among the known eclipsing binaries with K- or M-type stars. Its orbital period is one of the longest, and its rotational velocities is one of the lowest, which allows us to obtain very precise radial velocity measurements. The precision in physical parameters that we obtained places AK For among the binaries with the best mass measurements in the literature. It also fills the gap in our knowledge of stars in the range of 0.5-0.8 M and between short and long-period systems. All this makes AK For a unique benchmark for understanding the properties of low-mass stars.

Abstract Copyright:

Journal keyword(s): binaries: eclipsing - binaries: spectroscopic - stars: fundamental parameters - stars: individual: AK Fornacis

Simbad objects: 14

goto Full paper

goto View the reference in ADS

Number of rows : 14

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 2MASS J03262072+0312362 EB* 03 26 20.7332406184 +03 12 36.343249114           ~ 17 0
2 V* AK For EB* 03 29 22.8751821925 -24 06 03.096791542   10.46 9.36     K3VkFe+0.4 34 0
3 ASAS J045304-0700.4 EB* 04 53 04.4276013349 -07 00 23.505395476   11.99 11.13   10.284 K2V+K4/M4V 17 0
4 2MASS J07431157+0316220 EB* 07 43 11.5725336659 +03 16 22.102198067       16.02   ~ 15 0
5 FBS 1109+767 EB* 11 12 42.3412918233 +76 26 56.388992336   16.1   14.8   M4V 48 0
6 V* V636 Cen Al* 14 16 57.9116991617 -49 56 42.366293617   9.70 9.09     G0V 81 0
7 [KTR2013] V66 EB* 16 23 32.26 -26 31 41.1 17.71 17.621 16.843 16.20 15.64 ~ 11 0
8 M 4 GlC 16 23 35.22 -26 31 32.7           ~ 1679 0
9 UGCS J162358.09-263719.0 EB* 16 23 58.1041813022 -26 37 19.080482260 17.93 17.913 17.011 16.43 15.81 ~ 11 0
10 [DCO2008] T-Lyr1-17236 Al* 19 07 16.6176035210 +46 39 53.150159158   16.110 14.37 14.410   ~ 25 0
11 KOI-6667 Al* 19 37 06.9701122978 +41 26 12.800099012           G5V 29 0
12 Cl* NGC 6809 SAW V54 EB* 19 39 37.4260866026 -30 57 04.002229793           ~ 9 0
13 M 55 GlC 19 39 59.71 -30 57 53.1     6.49     ~ 759 0
14 KOI-126 EB* 19 49 54.2016304154 +41 06 51.427612209           ~ 82 1

    Equat.    Gal    SGal    Ecl

To bookmark this query, right click on this link: simbad:objects in 2014A&A...567A..64H and select 'bookmark this link' or equivalent in the popup menu


2020.08.08-19:46:17

© Université de Strasbourg/CNRS

    • Contact