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Astron. Astrophys. 360, 637-641 (2000)
Research Note
Photometric orbital modulation in V 1080 Tauri
V. 
imon 1,
D. Hanzl 2,
P. koda 1 and
R. Gális 3
1 Astronomical Institute, Academy of Sciences, 251 65 Ond
ejov, Czech Republic (simon@asu.cas.cz, skoda@sunstel.asu.cas.cz)
2 Nicholas Copernicus Observatory and Planetarium, Kraví hora 2, 616 00 Brno, Czech Republic (hanzl@sci.muni.cz)
3 Faculty of Sciences, P.J. 
afárik University, Moyzesova 16, 041 54 Ko
ice, Slovakia (galis@kosice.upjs.sk)
Received 4 April 2000 / Accepted 6 June 2000
Abstract
We present a photometric study of the variable star V 1080
Tauri. All photometric data, spanning in total about 9 years, can
be folded with the period of 8.8451741 days, yielding a
single-wave course with the full amplitude of 0.14 mag. The
Hipparcos data show that the secular trend in the brightness
variations is not larger than 0.04 mag and that the modulation
persists for the whole covered interval. We modeled the light curve by
ellipsoidal variations because the spectroscopic analysis of
Martín (1993) proved V 1080 Tau to be a close binary. We
argue that the true orbital period is 17.690348 days, giving a
double-wave light curve which can be attributed to the proximity
effects in the semi-detached Algol binary. The absence of eclipses and
the relatively large amplitude suggest the inclination angle within
![[FORMULA]](img1.gif)
. The deviations from the ellipsoidal
modulation, mainly near the phases 0.25 and 0.5, are interpreted in
terms of interaction in the binary.
Key words: stars:
activity 
stars: binaries:
close
stars: binaries:
general
stars: circumstellar
matter
stars: individual: V 1080 Tau
Send offprint requests to: V. imon (simon@asu.cas.cz)
Contents
- 1. Introduction
- 2. Observations and the data collection
- 3. Analysis of the data
- 4. Discussion
- Acknowledgements
- References
© European Southern Observatory (ESO) 2000
Online publication: August 17, 2000
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