2005A&A...441.1087B


Query : 2005A&A...441.1087B

2005A&A...441.1087B - Astronomy and Astrophysics, volume 441, 1087-1097 (2005/10-3)

Indirect evidence for short period magnetic cycles in W UMa stars. Period analysis of five overcontact systems.

BORKOVITS T., ELKHATEEB M.M., CSIZMADIA S., NUSPL J., BIRO I.B., HEGEDUES T. and CSORVASI R.

Abstract (from CDS):

Complex period variations of five W UMa type binaries (AB And, OO Aql, DK Cyg, V566 Oph, U Peg) were investigated by analyzing their O-C diagrams, and several common features were found. Four of the five systems show secular period variations at a constant rate on the order of |{dot}(P)sec/P|∼10–7yr–1. In the case of AB And, OO Aql, and U Peg a high-amplitude, nearly one-century long quasi-sinusoidal pattern was also found. It might be explained as light-time effect, or by some magnetic phenomena, although the mathematical, and consequently the physical, parameters of these fits are very problematic, as the obtained periods are very close to the length of the total data range. The most interesting feature of the studied O-C diagrams is a low amplitude (∼2-4x10–3d) modulation with a period around 18-20yr in four of the five cases. This phenomenon might be indirect evidence of some magnetic cycle in late-type overcontact binaries as an analog to the observed activity cycles in RS CVn systems.

Abstract Copyright:

Journal keyword(s): binaries: close - binaries: eclipsing - stars: activity - stars: general

Simbad objects: 15

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Number of rows : 15
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 V* GW Cep EB* 01 45 58.6227384192 +80 04 55.327969128   11.72 11.21 11.025 10.656 G3 65 0
2 V* VY Cet EB* 01 49 33.6929873856 -19 37 29.231904252   12.09 11.48 11.006 10.323 ~ 33 0
3 V* XY Leo EB* 10 01 40.4170488672 +17 24 32.602180644   10.66 9.68 8.855 8.474 K0V 273 0
4 V* AW Vir EB* 13 27 32.8814859576 +03 02 28.513564980   11.85 11.30 10.516 10.157 F8 53 0
5 V* V502 Oph EB* 16 41 20.8608649992 +00 30 27.384298488   9.15 8.50   7.865 G2V+F9V 188 0
6 V* AK Her EB* 17 13 57.8236051704 +16 21 00.618202044   9.04 8.51   7.874 F4V 259 0
7 V* V566 Oph EB* 17 56 52.4103516432 +04 59 15.326210328   8.03 7.58     F5V 250 0
8 V* OO Aql SB* 19 48 12.6525764880 +09 18 32.374957356   10.26 9.49 8.773 8.762 F9V 226 1
9 V* V700 Cyg SB* 20 31 05.2474963704 +38 47 00.460821408   12.36 11.14 11.468 11.045 G2V 66 0
10 V* VW Cep EB* 20 37 21.6316723003 +75 36 01.894463230   8.13   7.0   G8V+K0V 543 0
11 V* DK Cyg EB* 21 35 02.6693386896 +34 35 45.395481192   10.98 10.56 10.154 9.914 A6V 141 0
12 V* EM Lac EB* 22 23 54.7818645024 +54 01 09.271578684   13.088 12.50 12.105 11.7 ~ 42 0
13 V* SW Lac EB* 22 53 41.6540031672 +37 56 18.607477416   9.65 8.51     K0Vv 361 0
14 V* AB And EB* 23 11 32.0859315024 +36 53 35.108950344   10.62 9.50 9.009 8.585 G5+G5V 264 0
15 V* U Peg EB* 23 57 58.4766636672 +15 57 10.087001640   10.26 9.63 8.871 8.970 G2V 247 0

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2023.06.03-10:44:29

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