J/A+AS/125/407 UBV photometry of V839 Ophiuchi (Akalin, 1997)
UBV photometry and period variations of V839 Ophiuchi
Akalin A., Derman E.
<Astron. Astrophys. Suppl. Ser. 125, 407 (1997)>
=1997A&AS..125..407A 1997A&AS..125..407A (SIMBAD/NED BibCode)
ADC_Keywords: Binaries, eclipsing ; Photometry, UBV
Keywords: binaries: eclipsing - stars: individual: V839 Oph
Abstract:
A complete period variation analysis and new light curves of V839 Oph
together with new ephemeris data are presented. The period variation
was found to be dP/dt=3.1x10^-7d/yr. The period increament indicates
that the conservative mass transfer rate from the less massive
component to the more massive one is 6.5x10^-7Msun/yr. We fitted
parabolic and we discuss the possible detection of sinusoidal curves
to the (O-C) diagram and sinusoidal oscillations with period of about
20yr and semi-amplitude of 0.0065 day. A simultaneous solution of the
B and V light curves was computed using the Wilson-Devinney synthetic
light-curve code. The light curve solution indicates that the A-type W
UMa-type system is in contact with a filling factor of ∼39%.
Objects:
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RA (2000) DE Designation(s)
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18 09 21.3 +09 09 04 V839 Oph = HD 166231 (variable star)
18 08 50.6 +09 04 16 BD+09 3578 = HD 166099 (comparison star)
18 08 33.6 +09 00 50 BD+08 3590 = HD 166048 (check star)
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2 53 1149 The data for light curves and colours of V839 Oph
between 1989 and 1994
table5 70 71 Epochs of minimum light of V839 Oph
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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- 12 F12.4 d HJD Heliocentric Julian day
16- 21 F6.3 mag DVmag ? Diferential V magnitude (1)
24- 29 F6.3 mag DBmag ? Diferential B magnitude (1)
32- 37 F6.3 mag DUmag ? Diferential U magnitude (1)
40- 45 F6.3 mag D(B-V) ? Diferential (B-V) colour
48- 53 F6.3 mag D(U-B) ? Diferential (U-B) colour
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Note (1): Differential measurement in the sense variable minus comparison,
after the correction for differential atmospheric extinction
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Byte-by-byte Description of file: table5
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Bytes Format Units Label Explanations
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1- 12 F12.4 d HJDMin Heliocentric Julian day at minimum light
15 I1 --- Type Type of the minimum
18- 24 A7 --- Data Data used to find the minimum (1)
27- 34 F8.1 d Epoch Epoch number
37- 44 F8.5 d (O-C) Linear ephemeris
47- 54 F8.5 d (O-C)'q Residuals from the quadratic ephemeris
57- 64 F8.5 d (O-Cs)' Residuals from the best fit
67- 68 I2 --- Ref Source of the minima time (2)
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Note (1): v: visual
pg: photographic
pe: photoelectric
Note (2): Sources :
1) Rigollet, 1947LAstr..61...54R 1947LAstr..61...54R
2) Binnendijk, 1960AJ.....65...79B 1960AJ.....65...79B
3) Wilaon and O'Toole, 1965PASP...77...58W 1965PASP...77...58W
4) Diethelm, 1974BBSAG..16....1D 1974BBSAG..16....1D
5) Diethelm, 1974BBSAG..17....1D 1974BBSAG..17....1D
6) Diethelm, 1975BBSAG..23....1D 1975BBSAG..23....1D
7) Diethelm, 1976BBSAG..29....1D 1976BBSAG..29....1D
8) Braune et al., 1981AN....302...53B 1981AN....302...53B
9) Diethelm, 1978BBSAG..39....1D 1978BBSAG..39....1D
10) Diethelm, 1979BBSAG..44....1D 1979BBSAG..44....1D
11) Diethelm, 1981BBSAG..56....1D 1981BBSAG..56....1D
12) This paper (data from Lafta and Grainger, 1985Ap&SS.114...23L 1985Ap&SS.114...23L)
13) Kreiner, 1988Roczn..59....1K 1988Roczn..59....1K
14) Ferrand, 1985BBSAG..58....1F 1985BBSAG..58....1F
15) Niarchos, 1988IBVS.3156....1N 1988IBVS.3156....1N
16) Kohl, 1985BBSAG..77....1K 1985BBSAG..77....1K
17) Diethelm, 1985BBSAG..77....1D 1985BBSAG..77....1D
18) Hanzl, 1990IBVS.3423....1H 1990IBVS.3423....1H
19) this paper
20) Hanzl, 1991IBVS.3615....1H 1991IBVS.3615....1H
21) Paschke, 1990BBSAG..96....1P 1990BBSAG..96....1P
22) Blattler , 1991BBSAG..98....1B 1991BBSAG..98....1B
23) Hanzl, 1994IBVS.4097....1H 1994IBVS.4097....1H
24) Agerer and Hubscher, 1995IBVS.4222....1A 1995IBVS.4222....1A
25) Demircan et al., 1994IBVS.4126....1D 1994IBVS.4126....1D
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Acknowledgements: Ayvur Akalin-Peletier
(End) Ayvur Akalin [Ankara University Observatory] 16-Dec-1997