J/other/Ser/180.71 Masses of visual binaries (Cvetkovic+, 2010)
On the component masses of visual binaries.
Cvetkovic Z., Ninkovic S.
<Serbian Astron. Journal, 180, 71-80 (2010)>
=2010SerAJ.180...71C 2010SerAJ.180...71C
ADC_Keywords: Stars, double and multiple ; Stars, masses
Keywords: binaries: visual - stars: fundamental parameters
Abstract:
In the Sixth Catalog of Orbits of Visual Binary Stars we found those
belonging to the Main Sequence to form a sample containing 432 visual
binaries. Their total masses were obtained dynamically, i.e. they were
calculated using the orbital elements and the new Hipparcos
parallaxes. For the same pairs the total mass was also found
astrophysically - by applying the mass-luminosity relation. The
apparent magnitudes of the components were found in two different
ways: by deriving them from total magnitudes and magnitude
differences, and by taking their values directly from a catalogue. The
results for these two approaches show no essential discrepancy. The
values of total masses obtained dynamically have a large dispersion
involving even completely unrealistic values. This is a clear
indication that the input data are not sufficiently reliable.
Nevertheless, in a large number of cases the agreement between total
masses obtained by us in two different ways is quite satisfactory
indicating that i) for many visual binaries, as a rule not too distant
and with high-quality orbital elements, the dynamical total masses can
be reliable; ii) the mass-luminosity relation yields quite
satisfactory estimates for the component masses when they belong to
the Main Sequence and iii) a correlation between the relative parallax
error and orbit grade exists.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 96 431 Input data on binaries
table2.dat 68 364 Determined magnitudes and spectral types for
binary stars from subsample of 364 ones
table3.dat 80 431 Calculated masses for binary stars of the whole
sample
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See also:
I/239 : The Hipparcos and Tycho Catalogues (ESA 1997)
I/311 : Hipparcos, the New Reduction (van Leeuwen, 2007)
V/39 : 4th Catalog of Orbits of Visual Binaries (Worley+, 1983)
http://www.usno.navy.mil/USNO/astrometry/optical-IR-prod/wds/orb6 :
6th Catalog of Orbits of Visual Binaries Home Page
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- WDS WDS number, HHMMm+DDMM
12- 22 A11 --- Name Star name
24- 29 I6 --- HIP HIP number
31- 35 F5.2 mag mt ?=- Integrated magnitude of the pair
37- 41 F5.3 mag Dmag ?=- magnitude difference
43- 47 F5.2 mag m1 Magnitude of A component
49- 53 F5.2 mag m2 ?=- Magnitude of B component
55- 60 F6.2 mas plx New parallax (van Leeuwen, 2007, Cat. I/311)
61- 62 A2 --- u_plx [??] Uncertainty flag on plx
64- 70 F7.2 yr Per Period (1)
72- 77 F6.3 s a Semimajor axis of orbit (1)
79 I1 --- G [1/5] Grade of orbit, 1 is best (1)
81- 87 F7.2 yr Per2 ? Second period from second grade
90- 94 F5.3 s a2 ? Second orbit semimajor axis from second grade
96 I1 --- G2 [2/5]? Second grade of orbit
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Note (1): From Sixth Catalog of Orbits of Visual Binary Stars,
http://www.usno.navy.mil/USNO/astrometry/optical-IR-prod/wds/orb6
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 6 I6 --- HIP HIP number
8- 12 F5.2 mag m1.I ? Apparent magnitude of component A
according to Approach I
14- 18 F5.2 mag m2.I ? Apparent magnitude of component B
according to Approach II
20- 24 F5.2 mag Mag1.I ? Absolute magnitude of component A
according to Approach I
26- 30 F5.2 mag Mag2.I Absolute magnitude of component B
according to Approach I
32- 36 F5.2 mag m1.II ? Apparent magnitude of component A
according to Approach I
38- 42 F5.2 mag m2.II ? Apparent magnitude of component B
according to Approach II
44- 48 F5.2 mag Mag1.II ? Absolute magnitude of component A
according to Approach II
50- 54 F5.2 mag Mag2.II ? Absolute magnitude of component B
according to Approach II
56- 57 A2 --- Sp1 Spectral type of component A
59- 60 A2 --- Sp2 Spectral type of component B
62- 68 A7 --- SpType WDS spectral type
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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- 6 I6 --- HIP HIP number
8 I1 --- G Grade of orbit (1 is the best)
10- 15 F6.2 mas plx Parallax
17- 21 F5.2 mas e_plx rms uncertainty on plx
23- 29 A7 --- SpType WDS spectral type
31- 35 F5.2 Msun M1.I ? Mass of primary according to Approach I
37- 41 F5.2 Msun M2.I ? Mass of secondary according to Approach I
43- 47 F5.2 Msun Mt.I ? Mass of the pair according to Approach I
49- 53 F5.2 Msun M1.II ? Mass of primary according to Approach II
55- 59 F5.2 Msun M2.II ? Mass of secondary according to Approach II
61- 65 F5.2 Msun Mt.II ? Mass of the pair according to Approach II
67- 71 F5.2 Msun Mdyn ? Dynamical mass of the pair
72 A1 --- n_Mdyn [>] > when dynamical mass exceeds 100M☉
74- 75 A2 --- Rem [*m ] Large discrepancies (1)
77- 80 F4.2 Msun Mdyn2 ? Second dynamical mass of the pair
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Note (1): Notes as follows:
* = large discrepancy between astrophysical and dynamical total masses
m = multiple star
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 04-Apr-2011