J/AJ/137/236 CC Com and BV Dra light curves (Yang+, 2009)
Orbital period changes and their evolutionary status for weak-contact binaries.
II. CC Comae Berenices and BV Draconis.
Yang Y.-G., Lu G.-L., Yin X.-G., Zhu C.-H., Nakajima K.
<Astron. J., 137, 236-245 (2009)>
=2009AJ....137..236Y 2009AJ....137..236Y
ADC_Keywords: Binaries, eclipsing ; Photometry, CCD ; Photometry, UBVRI
Keywords: binaries: close - binaries: eclipsing - stars: evolution -
stars: individual (CC Comae Berenices, BV Draconis)
Abstract:
Based on O-C curves, we present detailed period investigations of
two weak-contact binaries CC Com and BV Dra. It is found that the
periods of these two binaries have varied in a cyclic variation way
superposed on a secular period change. The periods and amplitudes of
the cyclic variations are P3=23.6(±0.4)yr and
A=0.0028(±0.0003)d for CC Com and P3=23.8(±0.6)yr and
A=0.0029(±0.0003)d for BV Dra.
Description:
CCD photometry for CC Com was carried out on 2008 February 3, using
the 85 cm telescope at the Xinglong Station of National Astronomical
Observatories of Chinese Academy of Sciences.
Objects:
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RA (2000) DE Designation(s) (files)
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12 12 06.0 +22 31 59 CC Com = V* CC Com (table3.dat)
15 11 50.4 +61 51 25 BV Dra = V* BV Dra (table5.dat)
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 79 196 CCD photometric observations in BVRI-bands of
the eclipsing binary CC Com
table5.dat 17 429 CCD photometric observations in V-band of the
eclipsing binary BV Dra
table6.dat 44 424 All available light minimum times for
CC Comae Berenices
table7.dat 55 69 All photometric and CCD light minimum times for
BV Dra
refs.dat 75 20 References
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 12 F12.4 d HJD-B B band Heliocentric Julian Date
14- 19 F6.3 mag Bmag B band magnitude
21- 32 F12.4 d HJD-V ? V band Heliocentric Julian Date
34- 39 F6.3 mag Vmag ? V band magnitude
41- 52 F12.4 d HJD-R ? R band Heliocentric Julian Date
54- 59 F6.3 mag Rmag ? R band magnitude
61- 72 F12.4 d HJD-I ? I band Heliocentric Julian Date
74- 79 F6.3 mag Imag ? I band magnitude
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Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 12 F12.4 d HJD Heliocentric Julian date
14- 17 F4.2 mag DVmag Differential V band magnitude
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Byte-by-byte Description of file: table6.dat
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Bytes Format Units Label Explanations
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1- 12 F12.4 d HJD Heliocentric Julian Date
14- 21 F8.1 --- Epoch Epoch (phase since reference epoch)
23- 25 A3 --- Meth Method of observation (G1)
27- 28 A2 --- Type [I II] Primary (I) or Secondary (II) minimum
30- 36 F7.4 --- (O-C) The (O-C) value
38- 44 F7.4 --- Res Light minimum time residual
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Byte-by-byte Description of file: table7.dat
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Bytes Format Units Label Explanations
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1- 12 F12.4 d HJD Heliocentric Julian Date
14- 21 F8.1 --- Epoch Epoch (phase since reference epoch)
23- 25 A3 --- Meth Method of observation (G1)
27- 28 A2 --- Type [I II] Primary (I) or Secondary (II) minimum
30- 36 F7.4 --- (O-C) The (O-C) value from Eq (3), linear ephemeris
38- 44 F7.4 --- (O-C)1 The (O-C) value from Eq (4), linear ephemeris,
least-squares fitting method
46- 52 F7.4 --- (O-C)2 The (O-C) value from Eq (5), non-linear method,
upward parabolic curve and a sinusoidal one
54- 55 I2 --- Ref Reference, in refs.dat file
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Byte-by-byte Description of file: refs.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Ref Reference number
4- 22 A19 --- BibCode BibCode
24- 52 A29 --- Aut Author's name
54- 75 A22 --- Com Comments
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Global notes:
Note (G1): Method as follows:
vi = visual
pe = photoelectric
CCD = CCD
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 31-Aug-2011