J/MNRAS/380/1599 Ephemeris of V382 Cyg and TU Mus (Qian+, 2007)
Evolutionary states of the two shortest period O-type overcontact binaries
V382 Cyg and TU Mus.
Qian S.-B., Yuan J.-Z., Liu L., He J.-J., Fernandez Lajus E., Kreiner J.M.
<Mon. Not. R. Astron. Soc., 380, 1599-1607 (2007)>
=2007MNRAS.380.1599Q 2007MNRAS.380.1599Q
ADC_Keywords: Binaries, eclipsing ; Ephemerides
Keywords: binaries: close - binaries: eclipsing - stars: early-type -
stars: evolution - stars: individual: V382 Cyg -
stars: individual: TU Mus
Abstract:
Up to now, V382 Cyg and TU Mus are the only two discovered O-type
overcontact binary stars with periods less than two days (P=1.8855
and 1.3873d). Both systems contain a visual companion. New eclipse
times and analyses of orbital period variations of the two systems are
presented. It is discovered that the periods of both binaries show
cyclic oscillations with periods of 47.70 and 47.73yr, while they
undergo continuous increases at rates of dP/dt=+4.4x10-7 and
+4.0x10-7d/yr, respectively.
Objects:
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RA (2000) DE Designation(s) (File)
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20 18 47.2 +36 20 26 V382 Cyg = V* V382 Cyg (table4.dat)
11 31 11.9 -65 44 32 TU Mus = V* TU Mus (table5.dat)
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table4.dat 62 97 Times of light minimum of V382 Cyg
table5.dat 62 38 Times of light minimum of TU Mus
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Byte-by-byte Description of file: table4.dat 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- 19 F6.4 d e_HJD ? rms uncertainty on HJD
22- 23 A2 --- Min [I II] First (I) or second (II) minimum
25- 27 A3 --- Obs Observation type: CCD, Pe (photoelectric),
Pg (photographic) or Vis (visual)
29- 36 F8.1 --- E Ephemeris E value
40- 46 F7.4 d (O-C)1 Observed minus computed value
for linear ephemeris (1)
48- 54 F7.4 d (O-C)2 Observed minus computed value
for quadratic ephemeris (2)
56- 62 F7.4 d Res Residuals
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Note (1): For V382 Cyg, Min.I=2436814.802+1.8855109dxE
For TU Mus, Min.I=2441669.3255+1.3872766dxE
Note (2):
For V382 Cyg:
Min.I=2436814.7610(±0.0021)+1.88550741d(±0.00000027)xE
+1.13(±0.05)x10-9xE2
+0.0148(±0.0020)sin[(0.0390°xE+71.08°(±0.06°)]
For TU Mus:
Min.I=2441669.3099(±0.0073)+1.38727095d(±0.00000113)xE
+5.96(±0.93)x10-10xE2
+0.0100(±0.0054)sin[0.0286°xE+346.1°(±9.9°)]
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 21-Jan-2008