J/AJ/152/219 BV(RI)c light curves of DD Indi (Samec+, 2016)
BVRI photometric 2015 WD analysis of the southern totally eclipsing, solar-type,
shallow-contact W UMa binary, DD Indus.
Samec R.G., Norris C.L., Van Hamme W., Faulkner D.R., Hill R.L.
<Astron. J., 152, 219-219 (2016)>
=2016AJ....152..219S 2016AJ....152..219S (SIMBAD/NED BibCode)
ADC_Keywords: Binaries, eclipsing ; Photometry, UBVRI
Keywords: binaries: close - binaries: eclipsing - stars: evolution -
stars: individual: DD Indus
Abstract:
Observations and a 2015 Wilson-Devinney Program analysis are
undertaken for the first precision observations of DD Indi. DD Indi is
of solar-type (T1∼5750K) and was determined to be a shallow-contact
eclipsing binary. It was observed from 2013 June through September at
Cerro Tololo InterAmerican Observatory in remote mode. The 24 inch
Boller and Chivens reflector, now under management by The Southeastern
Association for Resarch in Astronomy (SARA) was used. Five new eclipse
timings were obtained, for three primary and two secondary eclipses.
Seven more eclipse timings were calculated from All Sky Automated
Survey data. A possibly increasing period was found from all available
eclipse timings with a 5±2x10-11xE2 quadratic term. A BVRcIc
simultaneous synthetic light-curve analysis reveals that the system
has a mass ratio of ∼0.46, a ∼140K component temperature difference,
and two weak cool spots. The Roche Lobe fill-out of this W-type binary
is only ∼11%, and an inclination of ∼86° was determined. A time of
constant light of ∼16 minutes is measured around phase zero. More
detail is included in this report.
Description:
Our photometry was taken with the Southeastern Association for
Research in Astronomy (SARA South) Telescope at Cerro Tololo
InterAmerican Observatory (CTIO) in remote mode. The 24 inch F/11
Boller and Chivens reflector was used on five nights, 2013 June 21,
July 30, August 01 and 29, and September 01 with the ARC Camera cooled
to -110°C. Sample nightly B, V, and B-V color light curves are
given for 2013 July 30, August 29, and September 01 using standard
BVRcIc Johnson-Cousins filters in Figures 2(a), (b), and (c) in
the paper. The precision of a single observation was excellent, 4, 7,
5, and 6mmag in Ic, Rc, V, and B, respectively. The observations
included, 313 in B, and 310 in V, 301 in Rc and 261 in Ic.
Exposure times varied from 40 to 60s in B, 16 to 25s in V, and 20s in
R and I. Our complete set of observations is given in Table1.
Objects:
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RA (ICRS) DE Designation(s) (Period)
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21 24 47.14 -47 10 50.5 DD Indi = ASAS J212447-4710.9 (P=0.3627353)
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 15 1185 Observations of DD Indi
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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)
II/264 : ASAS Variable Stars in Southern hemisphere (Pojmanski+, 2002-2005)
J/AJ/152/227 : BV(RI)c light curves of NSVS 5066754 (Samec+, 2016)
J/MNRAS/463/4210 : All-sky catalog of solar-type dwarfs (Nascimbeni+, 2016)
Byte-by-byte Description of file: table1.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- 9 F7.4 --- HJD [4.9/76.7] Modified Heliocentric Julian Date
(HJD-2456460)
11- 15 F5.3 --- Dmag [1.2/2.27] The Δ magnitude in Flt (in
the sense of the variable minus comparison) (1)
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Note (1): The comparison star is designated as TYC 8427-0079. The precision of a
single observation was excellent, 4, 7, 5, and 6mmag in Ic, Rc, V, and
B, respectively.
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History:
From electronic version of the journal
(End) Prepared by [AAS]; Sylvain Guehenneux [CDS] 27-Jan-2017