Volume 417, Number 2, April II 2004
|Page(s)||689 - 693|
|Section||Stellar structure and evolution|
|Published online||19 March 2004|
IO Aqr: Twins just at turn off? *
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: firstname.lastname@example.org
3 Copernicus Astronomical Center, ul. Bartycka 18, 00-716 Warszawa, Poland e-mail: email@example.com
Corresponding author: W. Dimitrov, firstname.lastname@example.org
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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