2002A&A...387..969K


C.D.S. - SIMBAD4 rel 1.7 - 2020.03.29CEST18:26:52

2002A&A...387..969K - Astronomy and Astrophysics, volume 387, 969-976 (2002/6-1)

Starspots and photometric noise on observed minus calculated (O-C) diagrams.

KALIMERIS A., ROVITHIS-LIVANIOU H. and ROVITHIS P.

Abstract (from CDS):

The effects of starspots on the O-C diagrams of eclipsing binaries are investigated, with a special emphasis on contact binaries. It is shown that starspots modulate the O-C differences in a fundamentally different way than real orbital period variations. Migrating starspots can only introduce high frequency, low amplitude disturbances (generally less than 0.01d), whose characteristics are numerically specified for typical contact binaries. It becomes evident that the observed systematic short timescale variations of the O-C diagrams of active contact binaries (even those like VW Cep) cannot be attributed to starspots. Furthermore, the basic property of non-linear modulation of O-C differences is emphasised. This non-linearity has serious consequences for the widespread traditional method of O-C diagram analysis. This traditional method is found inappropriate even on a fundamental level, and its mathematical and physical inconsistencies are reviewed.

Abstract Copyright:

Journal keyword(s): stars: binaries: eclipsing - starspots - stars: variables: general

Status at CDS:  

Simbad objects: 5

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Number of rows : 5

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 HD 106400 WU* 12 14 20.99618 +11 49 09.3870   9.94 9.22 9.37 8.390 G8V 215 0
2 V* AU Ser WU* 15 56 49.4688123911 +22 16 01.590194012   11.76 11.04 10.93   G4V 92 0
3 V* SW Cyg Al* 20 06 57.9310468060 +46 17 58.147253224   9.57 9.35     A2 150 0
4 V* VW Cep EB* 20 37 21.6248469581 +75 36 01.889162699   8.13   7.0   G8V+K0V 520 0
5 V* AB And EB* 23 11 32.0860884375 +36 53 35.107206154   10.62 9.50     G5+G5V 249 0

    Equat.    Gal    SGal    Ecl

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2020.03.29-18:26:52

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