SpringerLink
Forum Springer Astron. Astrophys.
Forum Whats New Search Orders


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

Next Section Table of Contents

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

SIMBAD Objects

Contents

Next Section Table of Contents

© European Southern Observatory (ESO) 2000

Online publication: October 30, 19100
helpdesk.link@springer.de