| Issue |
A&A
Volume 417, Number 2, April II 2004
|
|
|---|---|---|
| Page(s) | 689 - 693 | |
| Section | Stellar structure and evolution | |
| DOI | https://doi.org/10.1051/0004-6361:20031741 | |
| Published online | 19 March 2004 | |
IO Aqr: Twins just at turn off? *
1
Astronomical Observatory of Adam Mickiewicz University, ul. Słoneczna 36, 60-286 Poznań, Poland
2
National Astronomical Observatory Rozhen, PO Box 136, 4700 Smolyan, Bulgaria e-mail: dzkolev@abv.bg
3
Copernicus Astronomical Center, ul. Bartycka 18, 00-716 Warszawa, Poland e-mail: alex@camk.edu.pl
Corresponding author: W. Dimitrov, dimitrov@amu.edu.pl
Received:
22
April
2003
Accepted:
8
December
2003
We present photometric and spectroscopic analysis of the
eclipsing binary IO Aqr with orbital period 
. The system is detached,
with similar almost spherical components. The star is classified as
G0 spectral type. In the analysis we have used spectra obtained at a 2-m telescope with a Coudé spectrograph
for two regions NaD and Hα, as well as ASAS I band photometry and R, V
photometry obtained at a 0.4 m telescope.
The model of the star was obtained using a code based on the Wilson-Devinney method.
The radii of the stars for our best fit are 
and
while the masses of the components are 
and
. Both components
are slightly evolved main sequence stars.
Key words: eclipsing binaries / binaries: spectroscopic / stars: individual: IO Aqr
© ESO, 2004
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