J/PAZh/24/918 ADS 9731: a new sextuple system (Tokovinin+, 1998)
ADS 9731: a new sextuple system.
Tokovinin A.A., Shatskii N.I., Magnitskii A.K.
<Pis'ma Astron. Zh. 24, 918 (1998)>
=1998PAZh...24..918T 1998PAZh...24..918T (SIMBAD/NED BibCode)
=1998AstL...24..795T 1998AstL...24..795T
ADC_Keywords: Binaries, spectroscopic ; Stars, double and multiple ;
Radial velocities
Abstract:
Observations with the correlation radial velocity meter of ADS 9731
were carried out during 1996-1997. We established that the components
A and D of the visual quadruple system ADS 9731 are spectroscopic
binaries with periods of 3.87 and 14.3 days, respectively. Their
orbits are computed. New photometry has demonstrated the absence of
eclipses in the close pair Aab. The spectral types and luminosities of
all six components matching the are found.
Object:
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RA (2000) DE Designation
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15 38 12.96 +36 14 48.3 ADS 9731A = HD 139691
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File Summary:
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File Name Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 41 89 Radial velocities and residuals
table5.dat 20 77 Magnitude difference AB-CD in V band
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Byte-by-byte description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 11 F11.3 d HJD Heliocentric Julian day
13- 19 F7.2 km/s RV Radial velocity
23- 27 F5.2 km/s e_RV Error of radial velocity
31- 35 F5.2 km/s resV ? Residual velocity to orbit
(for Aa, Ab and D only)
37 A1 --- REJECT [*] Rejected data in orbit refinement
39- 41 A3 --- COMP [Aa,Ab,Aab,D,C,CD] Components for which
measurements were carried out
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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- 11 F11.3 d JD Julian date
15- 20 F6.3 mag DVmag Magnitude difference: V(AB)-V(CD)
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Table 2. Elements of spectroscopic orbits
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Element | Aab | Dab
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P, days | 3.273284 ± 0.000073 | 14.284 ± 0.011
T, JD | 2450636.3686 ± 0.0018 | 2450621.28 ± 1.02
e | | 0.31 ± 0.07
w, deg. | | 86.4 ± 15.5
K1, km/s | 86.35 ± 0.49 | 9.92 ± 0.58
K2, km/s | 87.97 ± 0.51 |
Gamma, km/s | -34.12 ± 0.22 | -34.31 ± 0.88
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Table 3. Equivalent width of the correlation profile, EW, axial rotation Vsin_i
and radial velocity of the components (all in km/s)
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Comp. EW Vsin_i RV
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Aa 0.66±0.04 9.1±1.2 -34.12±0.22
Ab 0.46±0.04 7.0±2.0
C+D 1.44±0.03 -33.95±0.24
C 1.43±0.06 9.8±0.8 -34.02±0.33
D 1.68±0.12 10.1±1.4 -34.31±0.88
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Table 4. Photometry of the components of ADS 9731
I. Absolute photometry. (The errors are indicated in brackets)
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Parameter V B-V W-B V-R Source
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m(AB) 7.755 0.429 TYCHO
7.059 HIPPARCOS
7.671(7) 0.421 -0.145 0.356 K+91
7.73 0.44 0.41 Model
m(CD) 7.880 0.368 TYCHO
7.106 HIPPARCOS
7.736(7) 0.441 -0.171 0.395 K+91
7.68 0.42 0.39 Model
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II. Differential photometry. (The errors are indicated in brackets)
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Parameter DeltaV DeltaI DeltaJ DeltaH Source
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m(CD)-m(AB) -0.05 (1) 0.01(1) CCD97
-0.031(3) ASF98
-0.05 -0.01 0.00 0.01 Model
m(C)-m(A) 0.40(1) 0.58(1) 0.58(8) DCF95
0.18 0.22 0.23 0.26 Model
m(D)-m(C) 0.90(2) 1.05(5) 0.83(4) DCF95
1.10(10) 0.93(3) CCD97
1.10 0.96 0.91 0.83 Model
m(B)-m(A) 2.19(9) 2.05(8) 1.93(5) DCF95
>2 2.5 (5) CCD97
2.40 2.14 2.03 1.95 Model
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Reference:
K+91 = Kornilov V.G. et al., 1991TrSht..63....4K 1991TrSht..63....4K
DCF95 = Drummond et al., 1995ApJ...450..380D 1995ApJ...450..380D
CCD97 = this work, measurements with the CCD camera,
ASF98 = this work (see Table 5), measurements with the scanning photometer
Model = values predicted by the model given in Table 6.
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Table 6. Magnitudes, masses, colors and luminosities of the components (model)
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Comp. V SpType Mass B-V MV
M☉
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Aa 8.50 F4V 1.35 0.40 3.20
Ab 8.70 F5V 1.32 0.43 3.40
B 10.24 G4V 1.00 0.66 4.94
C 8.02 F3V 1.41 0.38 2.72
Da 9.12 F7V 1.26 0.50 3.82
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Table 7. Positional measurements of ADS 9731
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Subsystem Year P.A. Separation Source
deg arcsec
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AC 1829 86 15.3 WDS
1974 86 15.1 WDS
1991.25 85.8 15.02 HIPPARCOS
1994.4 85.8 14.8 DCF95
AB 1905 89 0.9 WDS
1974 82 1.1 WDS
1994.4 80.2 1.27 DCF95
CD 1829 8 1.3 WDS
1974 18 1.6 WDS
1983.43 18.2 1.598 Speckle
1986.40 18.6 1.584 Speckle
1991.32 19.0 1.591 Speckle
1994.5 18.4 1.55 DCF95
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(End) Veta Avedisova [INASAN] 21-Feb-1999