J/AJ/143/30 CCD photometry of V380 Cas (Christopoulou+, 2012)
The first photometric study and orbital solution/period analysis of the
misclassified binary system V380 Cas.
Christopoulou P.-E., Papageorgiou A., Kleidis S., Tsantilas S.
<Astron. J., 143, 30 (2012)>
=2012AJ....143...30C 2012AJ....143...30C
ADC_Keywords: Photometry, CCD ; Binaries, eclipsing ; Photometry, UBVRI
Keywords: binaries: close - binaries: eclipsing - stars: individual (V380 Cas)
Abstract:
We present the first multicolor CCD photometry for the eclipsing
binary V380 Cassiopeia (V380 Cas) observed on 34 nights in 2009 and
2010 at the University of Patras Observatory. The PHOEBE program based
on the Wilson-Devinney algorithm was used to analyze the first
complete BVRcIc light curves. It was found that V380 Cas was
misclassified and it is a well-detached system consisting of two
main-sequence stars. A range of solutions found to give satisfactory
fits to the observations is also investigated. The first orbital
solution based on the photometric mass ratio q=1.08 of almost equal
temperatures and masses and orbital inclination of i=86.57° was
obtained. In addition, based on all available times of light minima,
including 12 new ones, a new orbital period of P=2.714539884 days is
given.
Description:
First time CCD photometric observations were obtained with the 35.5cm
f/6.3 Schmidt-Cassegrain telescope at the University of Patras
Observatory for 18 nights from 2009 July to November and 16 nights
from 2010 July to August. The standard Johnson-Cousin-Bessel set of
BVRcIc filters was mounted. The FWHM of the stellar image varied from
2.5 to 5 pixels during the observations.
To investigate the variations of orbital period of V380 Cas we
compiled all available light minimum timings up to date, from 1899 to
2011, that together with our 12 new CCD observations consist of a
total of 175 (17 visual, 127 photographic, 26 CCD and 5 photoelectric)
times of minimum light which are listed in Table 4.
Objects:
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RA (2000) DE Designation(s) (Period)
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00 30 55.98 +73 40 06.4 V380 CAS = TYC 4307-1121-1 (P=2.7145399)
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File Summary:
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FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 75 2092 BVRI photometric observations for the eclipsing
binary V380 Cas
table4.dat 65 175 All available times of minimum of V380 Cas
(1899-2011)
refs.dat 127 23 References
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See also:
B/vsx : AAVSO International Variable Star Index VSX (Watson+, 2006-2013)
B/gcvs : General Catalogue of Variable Stars (Samus+ 2007-2012)
II/150 : Parameters of eclipsing binaries (Brancewicz+, 1980)
J/A+A/417/263 : Catalogue of Algol type binary stars (Budding+, 2004)
J/AcA/54/207 : Ephemerids of eclipsing binaries (Kreiner, 2004)
J/A+A/446/785 : Catalogue of eclipsing variables (Malkov+, 2006)
J/MNRAS/373/435 : Angular momentum of Algol binaries (Ibanoglu+, 2006)
J/other/JAVSO/38.183 : Time of minima of eclipsing binaries (Samolyk+, 2010)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 10 F10.4 d HJD-B B band observation in Heliocentric Julian Date
(HJD-2400000)
12- 18 F7.4 mag DBmag Differential B band magnitude (1)
20- 29 F10.4 d HJD-V ? V band observation in Heliocentric Julian Date
(HJD-2400000)
31- 37 F7.4 mag DVmag ? Differential V band magnitude (1)
39- 48 F10.4 d HJD-R ? RC band observation in Heliocentric Julian
Date (HJD-2400000)
50- 56 F7.4 mag DRmag ? Differential RC band magnitude (1)
58- 67 F10.4 d HJD-I ? IC band observation in Heliocentric Julian
Date (HJD-2400000)
69- 75 F7.4 mag DImag ? Differential IC band magnitude (1)
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Note (1): Magnitude differences between the variable star and the comparison
star.
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Byte-by-byte Description of file: table4.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 12 F12.4 d HJD Heliocentric Julian Date of minimum light
14- 16 A3 --- Method Detection method (pg, vis, pe or CCD) (2)
18- 25 F8.1 --- Epoch Epoch
27- 40 F14.11 d O-C The (O-C) value (3)
42- 62 A21 --- Obs Observer
64- 65 I2 --- Ref ? Reference, in refs.dat file
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Note (2): Method as follow:
pg = photographic
vis = visual
pe = photoelectric
CCD = CCD measurements
Note (3): The O-C values of all times of minimum light are computed with the
ephemeris given by the equation (2) in the paper.
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Byte-by-byte Description of file: refs.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 2 I2 --- Ref [1/23] Reference number
4- 22 A19 --- BibCode Bibliographic code
24- 48 A25 --- Aut Author's name
49-127 A79 --- Com Comments
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Sylvain Guehenneux [CDS] 08-Apr-2013