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Astron. Astrophys. 362, 169-188 (2000)


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Active eclipsing binary RT Andromedae revisited

T. Pribulla 1, D. Chochol 1, L. Milano 2,3, L. Errico 4, A.A. Vittone 4, F. Barone 2,3 and . Parimucha 1

1 Astronomical Institute of the Slovak Academy of Sciences, 059 60 Tatranská Lomnica, Slovakia (pribulla@ta3.sk)
2 Dipartimento di Scienze Fisiche, Universita di Napoli "Federico II", Via Cinthia, 80126 Napoli, Italy
3 Instituto Nazionale di Fisica Nucleare, Via Cinthia, 80126 Napoli, Italy
4 Osservatorio Astronomico di Capodimonte, Via Moiariello 16, 80131 Napoli, Italy

Received 25 January 2000 / Accepted 11 August 2000

Abstract

All available photometric and spectroscopic data of the short-period RS CVn-like binary RT And have been reanalyzed in a homogeneous way. The long-term orbital period change is explained by two period jumps, a continuous period decrease combined with the light-time orbit or two light-time orbits. UBVRIJK light curves without maculation effects together with the radial velocities of both components were analysed with the Wilson-Devinney program to compute the photometric and spectroscopic elements and derive the masses of the components: [FORMULA] = 1.10[FORMULA]0.02 [FORMULA] and [FORMULA] = 0.83[FORMULA]0.02 [FORMULA]. The high orbital inclination [FORMULA] was confirmed by photoelectric observations of the secondary minimum. The mean observed U light curve shows additional light during the secondary minimum. The small eccentricity found by several authors from the light-curve analysis cannot be ruled out. The face-to-face position of the spots on the surface of both components in 1971 indicates the possibility of a mass transfer from the primary to the secondary component through a magnetic bridge connecting both active regions. Analysis of all available light curves suggests a random position of starspots and does not confirm the idea of active longitude belts. The absolute parameters of the binary together with maximal apparent V brightness set the distance of RT And to 83[FORMULA]2 pc, close to the Hipparcos value of 75[FORMULA]6 pc.

Key words: stars: binaries: eclipsing – stars: individual: RT And – stars: magnetic fields

Send offprint requests to: T. Pribulla

© European Southern Observatory (ESO) 2000

Online publication: October 30, 19100

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