J/AJ/147/3 BV(RI)c light curves of V2421 Cyg (Samec+, 2014)
BVRcIc observations and analyses on V2421 Cygni, a precontact W UMa binary.
Samec R.G., Shebs T.S., Faulkner D.R., Van Hamme W., Mathis R.F.
<Astron. J., 147, 3 (2014)>
=2014AJ....147....3S 2014AJ....147....3S
ADC_Keywords: Binaries, eclipsing ; Photometry, UBVRI
Keywords: binaries: close - binaries: eclipsing - stars: evolution -
stars: individual: V2421 CYG
Abstract:
We present the first precision BVRI light curves, synthetic light
curve solutions, and a period study for the high amplitude solar type
binary, V2421 Cygni. The light curves have the appearance of an Algol
(EA) type; however, it is made up of dwarf solar type components in a
detached mode with a period of only 0.6331 days with an amplitude of
about a full magnitude, i.e., it is a precontact W UMa binary.
Flare-like disruptions occur in the light curves following the primary
and secondary eclipses possibly due to the line-of-sight track of a
gas stream. An associated stream spot and splash spot cause bright
equatorial spots on the stellar surface of the primary star. The more
massive star is the gainer, making this system a classic, albeit
dwarf, Algol.
Description:
Our 2010 BVRI light curves were taken with the Lowell 0.81m reflector
in Flagstaff from 2010 September 30 to October 2 with CRYOTIGER cooled
(< -100°C) 2K*2K NASACAM and standard BVRcIc filters. Observing
time was awarded due to our association with the National
Undergraduate Research Observatory (NURO). Individual observations
included 140 in B, 149 in V, 139 in R, and 135 in I.
Objects:
------------------------------------------------------------------------
RA (ICRS) DE Designation(s) (Period)
------------------------------------------------------------------------
20 14 38.57 +41 56 14.7 V2421 Cygni = GSC 03159-01247 (P=0.63302)
------------------------------------------------------------------------
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 15 563 Photometry of V2421 Cyg
--------------------------------------------------------------------------------
See also:
B/gcvs : General Catalogue of Variable Stars (Samus+ 2007-2013)
J/AJ/145/14 : BV(RI)c light curves of V1043 Cas (Samec+, 2013)
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1 A1 --- Flt [BVRI] Filter (B, V, Rc, Ic)
3- 7 F5.3 mag Dmag Differential magnitude (m-(GSC 3159-1731))
9- 15 F7.4 d HJD [69.5/71.9] Heliocentric Julian Date
(HJD-2455400)
--------------------------------------------------------------------------------
History:
From electronic version of the journal
(End) Sylvain Guehenneux [CDS] 25-Aug-2014