J/AJ/158/186 Photometry of 12 totally eclipsing W UMa stars (Kjurkchieva+, 2019)
Global parameters of 12 totally eclipsing W UMa stars.
Kjurkchieva D.P., Popov V.A., Petrov N.I.
<Astron. J., 158, 186 (2019)>
=2019AJ....158..186K 2019AJ....158..186K (SIMBAD/NED BibCode)
ADC_Keywords: Binaries, eclipsing ; Stars, variable ; Photometry, SDSS
Keywords: binaries: eclipsing - stars: fundamental parameters -
stars: individual
Abstract:
Photometric observations of 12 totally eclipsing W UMa binaries
(NSVS 3325547, V646 Lac, V1320 Cas, V539 Dra, V816 Cep, NSVS 9045055,
V1115 Cas, V902 Cep, V596 Peg, NSVS 1768818, V619 Peg, and NSVS 3198272)
are presented. We found that the longer (in phase units) the flat eclipses
are, the smaller the mass ratios (or the reciprocal values) are. The mass
ratios of five targets turned out close to the lower-mass ratio limit.
We found that the periods of V1115 Cas and V646 Lac increase, while that
of V596 Peg decreases. Masses, radii, and luminosities of the target
components were calculated by the light-curve solutions and Gaia distances.
In order to perform more reliable statistical analysis of the results
we added to the sample of 12 targets from this paper another 29 totally
eclipsing W UMa stars studied by us earlier. As a result we found the
following trends: (a) the radius and luminosity of the target components
increase with their mass but the dependencies are different from those
of main-sequence (MS) stars; (b) the temperatures of stellar components
whose masses are above 1 M☉ tend to be lower than those of the
corresponding MS stars, while the temperatures of stellar components whose
masses are below 1 M☉ tend to be higher than those of the
corresponding MS stars; (c) there is no relationship between the fillout
factor and mass ratio; and (d) 11 of the 41 targets are of A subtype,
24 are of W subtype, and 6 systems are with equal-temperature components.
Description:
CCD photometric observations of the targets were obtained in the g' and
i' bands. A description of the equipment and procedure for the reduction
of the data is given in Kjurkchieva et al. (2017RMxAA..53..133K 2017RMxAA..53..133K).
The photometric data were analyzed using the PHOEBE code (Prsa & Zwitter
2005ApJ...628..426P 2005ApJ...628..426P) by the procedure described in Kjurkchieva et al.
(2017, J/other/RMxAA/53.235). The synthetic light curves are shown in
Figures 1 and 2 as continuous lines.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 243 12 Parameters of targets from the Variable Star
Index (VSX) database
fig1g/* . 12 Sloan g' band light curves in Figures 1 & 2
fig1i/* . 12 Sloan i' band light curves in Figures 1 & 2
fig5/* . 3 O-C data in Figure 5
--------------------------------------------------------------------------------
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/143/99 : Photometry of W UMa eclipsing binaries (Terrell+, 2012)
J/other/RMxAA/53.235 : Photometry of 6 deep-contact W UMa (Kjurkchieva+, 2017)
J/ApJ/859/140 : Multi-band magnitudes for W UMa EB* candidates
(Chen+, 2018)
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 12 A12 --- Star Target star name
14- 15 I2 h RAh Hour of Right Ascension (J2000)
17- 18 I2 min RAm Minute of Right Ascension (J2000)
20- 24 F5.2 s RAs Second of Right Ascension (J2000)
26 A1 --- DE- Sign of the Declination (J2000)
27- 28 I2 deg DEd Degree of Declination (J2000)
30- 31 I2 arcmin DEm Arcminute of Declination (J2000)
33- 36 F4.1 arcsec DEs Arcsecond of Declination (J2000)
38- 48 F11.9 d Per [0.283497/0.416169] Period
50- 54 F5.2 mag mag [10.85/13.7] Magnitude in Filt
56- 57 A2 --- Filt Filter
59- 62 F4.2 mag Amp [0.28/0.66] Amplitude
64- 88 A25 --- Ref Reference
90-108 A19 --- Bibcode Bibcode of the reference
110-185 A76 --- Com Comment on reference
187-205 A19 --- FileName1 File name in subdirectory fig1g
207-225 A19 --- FileName2 File name in subdirectory fig1i
227-243 A17 --- FileName3 File name in subdirectory fig5
--------------------------------------------------------------------------------
Byte-by-byte Description of file: fig1g/*
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 16 F16.8 d HJD Heliocentric Julian Date of observation
18- 23 F6.3 mag gmag Observed Sloan g' band magnitude
25- 29 F5.3 mag e_gmag Magnitude error
--------------------------------------------------------------------------------
Byte-by-byte Description of file: fig1i/*
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 16 F16.8 d HJD Heliocentric Julian Date of observation
18- 23 F6.3 mag imag Observed Sloan i' band magnitude
25- 29 F5.3 mag e_imag Magnitude error
--------------------------------------------------------------------------------
Byte-by-byte Description of file: fig5/*
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1 A1 --- Type [PS] Type of minima (P=Primary; S=Secondary)
3- 18 F16.8 d HJD-obs Observed Heliocentric Julian Date of minima
20- 26 F7.5 d e_HJD-obs ? Uncertainty in HJD-obs
28- 36 F9.2 --- Cycle Cycle number (1)
38- 53 F16.8 d HJD-calc Calculated minima (IRIDA) (2)
55- 65 F11.8 d O-C Observed-Calculated
--------------------------------------------------------------------------------
Note (1): For Epoch=2458047.459410 (V0596 Peg); 2458043.338130 (V0646 Peg);
2453388.369000 (V1115 Cas).
Note (2): For Period=0.28349603d (V0596 Peg); 0.30082310d (V0646 Peg);
0.32329000d (V1115 Cas). The research was made with the support of the private
IRIDA Observatory (http://www.irida-observatory.org/).
--------------------------------------------------------------------------------
History:
From electronic version of the journal
(End) Prepared by [AAS], Tiphaine Pouvreau [CDS] 05-Feb-2020