2015A&A...581A.106G


Query : 2015A&A...581A.106G

2015A&A...581A.106G - Astronomy and Astrophysics, volume 581A, 106-106 (2015/9-1)

The Araucaria project. Precise physical parameters of the eclipsing binary IO Aquarii.

GRACZYK D., MAXTED P.F.L., PIETRZYNSKI G., PILECKI B., KONORSKI P., GIEREN W., STORM J., GALLENNE A., ANDERSON R.I., SUCHOMSKA K., WEST R.G., POLLACCO D., FAEDI F. and POJMANSKI G.

Abstract (from CDS):

Our aim is to precisely measure the physical parameters of the eclipsing binary IO Aqr and derive a distance to this system by applying a surface brightness - colour relation. Our motivation is to combine these parameters with future precise distance determinations from the Gaia space mission to derive precise surface brightness - colour relations for stars. We extensively used photometry from the Super-WASP and ASAS projects and precise radial velocities obtained from HARPS and CORALIE high-resolution spectra. We analysed light curves with the code JKTEBOP and radial velocity curves with the Wilson-Devinney program. We found that IO Aqr is a hierarchical triple system consisting of a double-lined short-period (P=2.37d) spectroscopic binary and a low-luminosity and low-mass companion star orbiting the binary with a period of >25000d (>70yr) on a very eccentric orbit. We derive high-precision (better than 1%) physical parameters of the inner binary, which is composed of two slightly evolved main-sequence stars (F5 V-IV+F6 V-IV) with masses of M1=1.569±0.004 and M2=1.655±0.004M and radii R1=2.19±0.02 and R2=2.49±0.02R. The companion is most probably a late K-type dwarf with mass ≃0.6M. The distance to the system resulting from applying a (V-K) surface brightness - colour relation is 255±6(stat.)±6(sys.) pc, which agrees well with the Hipparcos value of 270+91–55 pc, but is more precise by a factor of eight.

Abstract Copyright:

Journal keyword(s): binaries: eclipsing - binaries: spectroscopic - stars: fundamental parameters - stars: distances - stars: solar-type

Simbad objects: 14

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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 - 2022
#notes
1 V* AI Phe EB* 01 09 34.1924055096 -46 15 56.071719360   9.26 8.60     G3V 137 0
2 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 6285 1
3 * bet Per EB* 03 08 10.1324535 +40 57 20.328013 1.70 2.07 2.12 2.08 2.11 B8V 1180 2
4 V* CD Tau EB* 05 17 31.1530161432 +20 07 54.627762000 7.27 7.25 6.76     A5:IapHIwk: 159 0
5 HD 37071 EB* 05 37 32.5090124664 +37 05 12.259074408   8.59 8.05     G0 67 0
6 * bet Aur EB* 05 59 31.7229284 +44 56 50.757259 1.97 1.93 1.90 1.82 1.83 A1IV-Vp 410 0
7 V* GX Gem EB* 06 46 09.1272024000 +34 24 52.792971336   11.99 11.71     G5 58 0
8 V* RZ Cha EB* 10 42 24.1088348064 -82 02 14.183233152   8.54 8.09     F3/5V 103 0
9 V* DM Vir EB* 14 07 52.4283264888 -11 09 07.472310912   9.25 8.79     F5V 97 0
10 NAME Baade Window reg 18 03.5 -30 01           ~ 575 3
11 V* V422 Cyg Mi* 20 04 00.0668440104 +37 49 35.683568616         11.028 M5 10 0
12 V* V442 Cyg EB* 20 27 52.3040139552 +30 47 28.346913456   10.18 9.70     F2 70 0
13 V* IO Aqr EB* 20 40 45.4694967096 +00 56 21.006276900   9.34 8.86     F5V 30 0
14 V* EI Cep EB* 21 28 28.2054524664 +76 24 12.585894552   7.94 7.61     F3V+F1m 126 0

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2022.05.26-01:58:40

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