J/A+A/549/A86 Period change for 143 SuperWASP eclipsing binaries (Lohr+, 2013)
Period and period change measurements for 143 SuperWASP eclipsing binary
candidates near the short-period limit and discovery of a doubly eclipsing
quadruple system.
Lohr M.E., Norton A.J., Kolb U.C., Maxted P.F.L., Todd I., West R.G.
<Astron. Astrophys., 549, A86 (2013)>
=2013A&A...549A..86L 2013A&A...549A..86L
ADC_Keywords: Binaries, eclipsing ; Stars, variable ; Photometry, CCD
Keywords: binaries: close - binaries: eclipsing - stars: variables: general
Abstract:
Building on previous work, a new search of the SuperWASP archive was
carried out to identify eclipsing binary systems near the short-period
limit. 143 candidate objects were detected with orbital periods
between 16000 and 20000s, of which 97 are new discoveries. Period
changes significant at 1σ or more were detected in 74 of these
objects, and in 38 the changes were significant at 3σ or more.
The significant period changes observed followed an approximately
normal distribution with a half-width at half-maximum of ∼0.1s/yr.
There was no apparent relationship between period length and magnitude
or direction of period change. Amongst several interesting individual
objects studied, 1SWASP J093010.78+533859.5 is presented as a new
doubly eclipsing quadruple system, consisting of a contact binary with
a 19674.575s period and an Algol-type binary with a 112799.109s
period, separated by 66.1AU, being the sixth known system of this
type.
Description:
Derived light curve characteristics including periods and period
change measurements are presented here for 143 eclipsing binary
candidates with periods close to the main sequence binary period
distribution's lower limit of ∼0.20d. The light curves were extracted
from the archive of the SuperWASP project, which has taken high
cadence (6-40min) observations of bright (∼8-15Vmag) stars over almost
the whole sky since 2003. RA and DEC are extracted from the SuperWASP
identifiers, themselves based on USNO B-1.0 coordinates for
corresponding point sources.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 118 143 Period and period change determinations for
143 eclipsing binary candidates
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See also:
II/264 : Southern hemisphere ASAS Variable Stars (Pojmanski+, 2002-05)
J/A+A/528/A90 : SuperWASP short period eclipsing binaries (Norton+, 2011)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 19 A19 --- 1SWASP SuperWASP identifier (JHHMMSS.ss+DDMMSS.s)
21- 22 I2 h RAh Right ascension (J2000) from SuperWASP ID
24- 25 I2 min RAm Right ascension (J2000) from SuperWASP ID
27- 31 F5.2 s RAs Right ascension (J2000) from SuperWASP ID
33 A1 --- DE- Declination (J2000) from SuperWASP ID
34- 35 I2 deg DEd Declination (J2000) from SuperWASP ID
37- 38 I2 arcmin DEm Declination (J2000) from SuperWASP ID
40- 43 F4.1 arcsec DEs Declination (J2000) from SuperWASP ID
45- 70 A26 --- ID Previous ID as variable star (1)
72 A1 --- n_ID [ab] ELL or DSCT variable (Cat. B/gcvs) (2)
74- 78 F5.2 mag Vmag Mean SuperWASP V magnitude
80- 84 F5.2 mag min1 Primary depth V magnitude
86- 90 F5.2 mag min2 Secondary depth V magnitude
92-100 F9.3 s Per Period (±0.0005s)
102-108 F7.4 s/yr dP/dt ? Period variation (3)
110-115 F6.4 s/yr e_dP/dt ? rms uncertainty on dP/dt (3)
117-118 I2 --- q_dP/dt ? (rounded) significance level in
σ unit (3)
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Note (1): Numbers refer to Table 1 in Norton et al. (2011, Cat. J/A+A/528/A90,
recno of VizieR table). Numbers in parentheses refer to objects with
almost identical RA and DE to those in J/A+A/528/A90.
Note (2): Notes as follows:
a = Identified as ellipsoidal variable in GCVS
b = Identified as δ Scuti variable by ROTSE
Note (3): Only period changes detected at 1σ or more are included.
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Acknowledgements:
Marcus Lohr, Marcus.Lohr(at)open.ac.uk
(End) Marcus Lohr [OU, UK], Patricia Vannier [CDS] 22-Apr-2013