J/MNRAS/405/1930 Period changes of EA-, EB- and EW-types binaries (Liao+, 2010)
The most plausible explanation of the cyclic period changes in close binaries:
the case of the RS CVn-type binary WW Dra.
Liao W.-P., Qian S.-B.
<Mon. Not. R. Astron. Soc., 405, 1930-1939 (2010)>
=2010MNRAS.405.1930L 2010MNRAS.405.1930L
ADC_Keywords: Binaries, eclipsing ; Morphology
Keywords: methods: statistical - binaries: close - binaries: eclipsing -
stars: individual: WW Dra - stars: late-type
Abstract:
Cyclic period changes are a fairly common phenomenon in close binary
systems and are usually explained as being caused either by the
magnetic activity of one or both components or by the light travel
time effect (LTTE) of a third body. We searched the orbital period
changes in 182 EA-type (including the 101 Algol systems used by Hall,
1989, Space Sci. Rev., 50, 219), 43 EB-type and 53 EW-type binaries
with known mass ratio and spectral type of the secondary component. We
reproduced and improved the diagram in Hall according to the new
collected data.
Description:
Our study includes the stars listed in Kreiner, Kim & Nha (2001, An
Altas of O-C Diagrams of Eclipsing Binary Stars. Wydawnictwo Naukowe
Akademii Pedagogicznej, Cracow, Poland), the 101 Algol systems in
Giuricin et al. (1983ApJS...52...35G 1983ApJS...52...35G) and the Algol-type binaries
listed in Ibanoglu et al. (2006, Cat. J/MNRAS/373/435). As selection
criteria we considered stars either that show cyclic period changes or
that have a secondary component of late spectral type. In total, 182
EA-type (including the 101 Algol systems used by Hall (1989, Space Sci.
Rev., 50, 219), 43 EB-type and 53 EW-type binaries were added to the
above sample.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 48 182 Period changes of semidetached and detached
Algol-type binaries
table2.dat 48 43 Period changes of EB-type binaries
table3.dat 52 53 Period changes of EW-type binaries
table5.dat 58 92 (O-C) data for WW Draco
refs.dat 177 155 References
--------------------------------------------------------------------------------
See also:
V/119 : Catalogue of field contact binary stars (Pribulla+, 2003)
J/MNRAS/373/435 : Angular momentum evolution of Algol binaries (Ibanoglu+ 2006)
Byte-by-byte Description of file: table[123].dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 13 A13 --- Star Star name
15- 25 A11 --- Sp2 Spectral type of the secondary component
27- 33 F7.5 --- q ]0,1]? Mass ratio
35 A1 --- DP [.idx -] Form of the period change, ΔP (1)
38- 39 A2 --- geo [SD D] Geometrical structure,
semidetached (SD) or detached (D) binaries,
only in table1
40- 42 I3 --- Ref ? Reference for Sp2 and/or q, in refs.dat file
43 A1 --- --- [,]
44- 46 I3 --- Ref2 ? Reference for Sp2 and/or q, in refs.dat file
47 A1 --- n_q [*] *: Ref2 is reference value for q
48 A1 --- n_Sp2 [+] +: Ref2 is reference value for Sp2
49 A1 --- --- [,]
50- 52 I3 --- Ref3 ? Reference for Sp2 and/or q, in refs.dat file
--------------------------------------------------------------------------------
Note (1): Form of the period change flag as follows:
- = no period change
. = systems for which we have inadequate data for judgement
i = period increase only
d = period decrease only
x = both an increase and decrease of the period
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table5.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 13 F13.5 d HJD Heliocentric Julian date of light minimum
14- 21 F8.1 d E Number of orbits elapsed from the initial
epoch of primary minimum
23- 29 F7.4 --- (O-C)1 (O-C) value of time of light minimum (1)
31- 38 F8.5 --- (O-C)2 ?=- (O-C) value of time of light minimum (2)
40- 47 F8.5 --- Res ?=- Residuals
49- 51 F3.1 --- w ? Weight of data point
52- 53 A2 --- n_w [nu] nu for not used data point
55- 57 I3 --- Ref Reference, in refs.dat file
58 A1 --- Note [*] * : mean value of three times of light
minimum
--------------------------------------------------------------------------------
Note (1): O-C value from equation:
Min.I = HJD 2427983.3236 + 4.6296328E(d)
Note (2): O-C value from equation:
Min.I = HJD 2427983.2814(±0.0188)
+ 4.6296389(±0.0000035)E(d)
+ 0.1977(±0.0096)sin[0.0497E(deg)+163.73(±0.95)(deg)]
--------------------------------------------------------------------------------
Byte-by-byte Description of file: refs.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 3 I3 --- Ref Reference number
5- 23 A19 --- BibCode BibCode
25- 58 A34 --- Aut Author's name
60-177 A118 --- Com Comments
--------------------------------------------------------------------------------
History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 13-Dec-2010