J/AJ/152/227 BV(RI)c light curves of NSVS 5066754 (Samec+, 2016)
Is NSVS 5066754 a near-contact or a marginal contact binary?
Samec R.G., Nyaude R., Caton D.B., Faulkner D.R.
<Astron. J., 152, 227-227 (2016)>
=2016AJ....152..227S 2016AJ....152..227S (SIMBAD/NED BibCode)
ADC_Keywords: Binaries, eclipsing ; Photometry, UBVRI
Keywords: binaries: close - binaries: eclipsing - stars: evolution -
stars: individual: NSVS 5066754
Abstract:
BVRcIc light curves of NSVS 5066754 were taken on 2014 May at Dark
Sky Observatory in North Carolina. This variable is a solar-type
eclipsing binary (T1∼5750K) with a period of only 0.3751689(1) days.
It appeared to be one of the shortest periods in Shaw's list of
near-contact binaries. The Binary Maker fits and our Wilson-Devinney
solutions show that the binary could have both semidetached and
marginal contact binary configurations. Five new times of minimum
light were calculated, along with two minima determined from archived
All Sky Automated Survey observations. From these minima and the
discovery epoch, a quadratic ephemeris was determined. Thus, a
magnetic braking scenario is possible. Both semidetached and contact
models were explored. A marginal contact solution had the best sum of
square residuals. It gave a mass ratio of ∼0.5, and a component
temperature difference of ∼360K, albeit somewhat large for a contact
binary. Two substantial cool spots were determined in this solution
with 37° and 28° radii and t-factors or 0.94 and 0.78
respectively. The fill-out is very shallow, ∼106%. It may have
recently achieved contact.
Description:
Our BVRcIc light curves were taken with the Dark Sky Observatory
0.81m reflector at Philips Gap, North Carolina, on 17-20 inclusive,
2014 May with a thermoelectrically cooled (-40°C) 2K*2K Apogee
Alta U44 CCD using standard Johnson-Cousins BVRcIc filters (320
observations with an exposure time of 60s in B, 333 observations with
an exposure time of 24s in V, 338 observations with an exposure time
of 20s in Rc, and 258 observations with an exposure time of 20s in
Ic). Our complete set of observations is given in Table2.
Objects:
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RA (ICRS) DE Designation(s) (Period)
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13 20 57.67 +47 29 30.3 NSVS 5066754 = UCAC3 275-121619 (P=0.3751689)
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 15 1173 Observations of NSVS 5066754
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See also:
B/vsx : AAVSO International Variable Star Index VSX (Watson+, 2006-2014)
B/gcvs : General Catalogue of Variable Stars (Samus+ 2007-2013)
J/AJ/152/219 : BVRI light curves of DD Indi (Samec+, 2016)
J/AJ/149/48 : BVRI light curves of ZZ Eri (Samec+, 2015)
J/AJ/149/30 : BVRI photometry of V1001 Cas in 2012 (Samec+, 2015)
J/AJ/147/3 : BV(RI)c light curves of V2421 Cyg (Samec+, 2014)
J/AJ/145/14 : BV(RI)c light curves of V1043 Cas (Samec+, 2013)
J/AJ/136/1067 : New beta Lyrae and Algol candidates in NSVS (Hoffman+, 2008)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1 A1 --- Flt [BVRI] Filter (Johnson-Cousins B, V, Rc, or Ic)
3- 8 F6.4 --- HJD [4.5/7.75] Modified Heliocentric Julian Date
(HJD-2457270)
10- 15 F6.3 mag Dmag [-0.45/0.76] The Δ magnitude in Flt (in
the sense of variable minus comparison star) (1)
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Note (1): The comparison star is designated as UCAC3 275-121609. The standard
error of a single observation was 6mmag in B, 5mmag in V, 5mmag in Rc,
and 5mmag in Ic.
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History:
From electronic version of the journal
(End) Prepared by [AAS]; Sylvain Guehenneux [CDS] 27-Jan-2017