J/A+A/281/811 Long-term variations in V471 Tau (Ibanoglu+ 1994)
Long-term luminosity variations and period changes in V471 Tau
IBANOGLU C., KESKIN V., AKAN M.C., EVREN S., TUNCA Z.
<Astron. Astrophys. 281, 811 (1994)>
=1994A&A...281..811I 1994A&A...281..811I
ADC_Keywords: Binaries, eclipsing; Photometry, UBV; Binaries, orbits
Keywords: stars: eclipsing binaries - stars: individual: V471 Tauri -
stars: magnetic - stars: rotation - stars: variables
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1 79 37 The updated mean brightness of V471 Tau
in B and V bands and B-V colours.
table2 46 157 The updated mid-eclipse timings and residuals
using the ephemeris given in the text.
table4 20 10 Masses of the third-body depending on the
orbital inclination.
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Byte-by-byte Description of file: table1
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Bytes Format Units Label Explanations
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1- 7 F7.2 yr Year
11- 16 F6.3 mag B B magnitude
17 A1 --- r_B [ *] When *, the value is computed.
18- 22 F5.3 mag e_B []? rms uncertainty on B magnitude
25- 29 F5.3 mag V V magnitude
30 A1 --- r_V [ *] When *, the value is computed.
31- 35 F5.3 mag e_V []? rms uncertainty on V magnitude
38- 42 F5.3 mag B-V B-V colour
43 A1 --- r_B-V [ *] When *, the value is computed.
44- 48 F5.3 mag e_B-V []? rms uncertainty on B-V colour
51- 55 I5 --- E Integer eclipse cycle number
59- 64 F6.3 mag DeltaB Difference with B mean brightness
68- 73 F6.3 mag DeltaV Difference with V mean brightness
78- 79 I2 --- Ref References (1)
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Note (1):
1 Nelson & Young(1970)
2 Young & Nelson(1972)
3 Cester & Pucillo(1976)
4 Ibanoglu(1978)
5 Tumer et al. (1982)
6 Oswalt(1979)
7 Tunca et al.(1979)
8 Skillman & Patterson(1988)
9 Evren et al.(1986)
10 Ibanoglu(1989)
11 This study
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Byte-by-byte Description of file: table2
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Bytes Format Units Label Explanations
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1- 11 F11.5 d Met Mid-eclipse time - 2400000
14- 18 I5 --- E Integer eclipse cycle number
21- 28 F8.5 s O-C(I) Observed - calculated value
31- 38 F8.5 s O-C(II) []? Observed - calculated value
42- 46 A5 --- Ref References (1)
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Note (1):
1 Young & Lanning (1975)
2 Cester & Pucillo (1976)
3 Anderson & Seeds (1972)
4 Warner et al. (1971)
5 Lohsen (1974)
6 Ibanoglu (1978)
7 Oliver & Rucinski (1978)
8 Beavers et al. (1979)
9 Tunca et al. (1979)
10 Tumer et al. (1982)
11 Young et al. (1983)
12 Ibanoglu & Evren (1984)
13 Ibanoglu (1989)
14 Skillman & Patterson (1988)
15 Eitter (1987)
16 This study
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Byte-by-byte Description of file: table4
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Bytes Format Units Label Explanations
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6- 7 I2 deg I Inclination
16- 20 F5.3 solMass M Mass
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Table 3: Parameters of the third-body orbit.
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Parameter Value Standard deviation
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a sin i 3.483 x 10+7 km 0.057 x 10+7 km
e 0.614 0.035
w 29.3 deg 3.2 deg
To HJD 24 40982 43
Po 8548 days 48 days
to HJD 2440610.06434 0.00015
P' 0.521183286 days 3 x 10-9 days
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(End) Patricia Bauer [CDS] 17-Nov-1993