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J/A+A/310/879 Hyades binaries (Barrado+, 1996)
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Lithium abundance in binaries of the Hyades open cluster
Barrado y Navascues D., Stauffer J.R.
<Astron. Astrophys. 310, 879 (1996)>
=1996A&A...310..879B (SIMBAD/NED BibCode)
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ADC_Keywords: Photometry, UBV
Keywords: stars: abundances - stars: binaries: close - star: late-type -
open clusters: Hyades
Description:
We have derived accurate and homogeneous lithium abundances in 49 Main
Sequence binary systems belonging to the Hyades open cluster by using
a deconvolution method to determine individual magnitudes and colors
for the primary and secondary components of the binary. The input
parameters of the model are the observed Li equivalent width, the
actual distance to the binary, the integrated apparent magnitude and
the integrated colors of the binaries -BV(RI)_K_. We show that the
general behavior is the same in binaries and in single stars (Li is
depleted faster in K stars than in G stars and there is a deep dip for
mid-F stars). However, there is a larger scatter in the abundances of
binary systems than in single stars. Moreover, in general, binary
systems have an overabundance, which is more conspicuous in close
binaries. In fact, there is a cut-off period, which can be estimated
as P_orb_~9d. This value is in excellent agreement with the
theoretical prediction of Zahn (1994).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1 105 49 *Deconvolution for the Hyades binaries
table1.tex 159 212 LaTeX version of table1
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Note on table1: The photometry is essentially from Johnson & Knuckles
(=1955ApJ...122..209J) and the distances from Stern (1994). Spectral
types for the primary and secondary components were assigned from
(B-V) color indices by using the Schmidt-Kaler's (1982) ZAMS.
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Byte-by-byte Description of file: table1
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Bytes Format Units Label Explanations
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2- 11 A10 --- Name Star name (1)
14- 15 I2 --- n_Name ? Note on the star (2)
19- 23 F5.3 mag B-Vobs Observed system B-V colour index
25 A1 --- l_B-V1 [~] Flag on B-V1
26- 30 F5.3 mag B-V1 ? (B-V) colour index of the primary component
32- 36 F5.3 mag B-V2 ? (B-V) colour index of the secondary component
39- 43 F5.2 pc Dist Distance
44 A1 --- u_Dist Uncertainty flag on distance
45 A1 --- n_Dist Note on distance (3)
49- 53 F5.3 mag MVmag Observed absolute V magnitude
55 A1 --- n_MVmag Note on MVmag (3)
59- 63 F5.3 mag MVmag1 ? Absolute V magnitude of the primary
65- 70 F6.3 mag MVmag2 ? Absolute V magnitude of the secondary
72- 76 F5.2 mag Vmag Apparent V magnitude
78- 84 A7 --- Sp Spectral type of the binary
86- 91 A6 --- Sp1 Spectral type of the primary component
93- 98 A6 --- Sp2 Spectral type of the secondary component
100-105 A6 --- Bin Binarity type
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Note (1): vB: van Bueren, 1952
BD: Donner Durchmusterung
J: Johnson et al., 1968
vA: van Altena, 1969
Note (2): Individual notes:
1 ADS 2451. The photometry include the visual companion.
Mason et al. (1993) estimated {DELTA}V=6.0mag.
2 Distance and spectral types from Strassmeier et al 1993.
(B-V)_p_ was assigned according the spectral type.
3 {DELTA}V=1.75mag from Griffin & Gunn (1981). Probable triple system.
4 {DELTA}V=0.5mag from Griffin & Gunn (1981).
5 (B-V)_p_ measured directly during the eclipse (Schiller & Milone 1987).
6 {DELTA}V=0.35mag from Batten & Wallerstein (1973). It could have an
additional component.
7 {DELTA}V=1.12mag from Griffin et al. (1982).
8 ADS 3135. {DELTA}V=1.0mag from Wickes (1975). V={7.24+8.24} from
Peterson & Solenski (1987). Visual companion included in the photometry.
9 Boesgaard & Tripicco (1986) obtained {DELTA}V=0.056mag from the ratio
between spectral lines.
10 Visual component included in the photometry.
11 ADS 3169. Visual component included in the photometry.
12 The contribution from the secondary is apparently negligible.
13 The contribution from the secondary is apparently negligible.
14 {DELTA}V=2.0mag from Griffin et al. (1985).
15 {DELTA}V=0.45mag from Peterson & Solenski (1987). V={7.01+7.46}.
The visual companion is included in the photometry.
16 ADS 3210. {DELTA}V=0.50mag from Heintz (1969). V={8.06+8.56} from
Peterson & Solenski (1987). The visual companion is included in the
photometry.
17 V_obs_=9.03 from Mermilliod (1976).
18 ADS 3248. {DELTA}V=0.65mag from Dombrowski (1991). Triple system.
The inner pair is the SB2. The whole deconvolution is
{F7 V + K0 V} + F9 V, V = {3.644+5.655} +4.136,(B-V)
= {0.481+0.819} + 0.545
19 The contribution from the secondary is apparently negligible.
20 The visual companion is not included in the photometry.
21 Strassmeier et al. (1993) give M_V_=6.8mag, D=16.7 pc and dK5e.
Apparent magnitude from Eggen & Greenstein (1965). Distance from
Borgman & Lippicott (1983). Another possibility for the
deconvolution could be
(B-V)_calc_=1.085, (B-V)_p_=1.068, (B-V)_s_=1.7, M_calc_=6.648,
M_p_=6.687, M_s_=10.291, (1+{alpha})=1.036, {DELTA}V=3.6mag.
22 {DELTA}V=2.0, Griffin et al. (1985).
23 The deconvolution was taken from Griffin et al. (1985).
24 The contribution from the secondary is apparently negligible.
25 {DELTA}V=0.14mag, Spectral types, distance and deconvolution from
Griffin et al. (1985).
26 V_primary_=10.28, V_secondary_=10.59, Griffin & Gunn (1978). Distance
from Schwan (1991), Spectral types from Strassmeier et al. (1993)
27 {DELTA}V=0.2mag from Thorburn et al. (1993) from the ratio between
CaI6718A. V_obs_=7.34, 7.59, 7.71, 7.73 and 8.18, from Schwan (1991),
Mermilliod (1976), Stern (1994) and Mason et al. (1993), respectively.
28 ADS 3475. Also (B-V)_obs_=0.50 from Mermilliod (1976).
{DELTA}V=0.19mag from Dombrowski (1991). The visual component is
included in the photometry.
29 ADS 3483. Triple system (Griffin et al. 1985):
{F5 V + G8 V} + G4 V, V = {3.4 + 5.58} + 4.96,
(B-V) = {0.42 + 0.81} + 0.68
Note (3): a: Distance estimated from the photometry.
b: Calculated from V and <m-M>_binary_=3.40
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References:
Batten A.H. & Wallerstein G., 1973, Publ. Dominion Astrophys. Obs., 14, 135
(=1973PDAO...14..135B)
Boesgaard A.M. & Tripicco M.J., 1986, ApJ., 302, L49 (=1986ApJ...302L..49B)
Borgman & Lippicott 1983, AJ 88, 120
Dombrowski E.G., 1991, Ph.D. thesis, Georgia State Univ.
Eggen O.J. & Greenstein J.L., 1965, ApJ, 141, 83 (=1965ApJ...141...83E)
Griffin R.F. & Gunn J.E., 1978, Astron. J., 83, 1114 (=1978AJ.....83.1114G)
Griffin R.F. & Gunn J.E., 1981, Astron. J., 86, 588 (=1981AJ.....86..588G)
Griffin R.F. et al., 1982, A&A 106, 221 (=1982A&A...106..221G)
Griffin R.F. et al., 1985, Astron. J., 90, 609 (=1985AJ.....90..609G)
Heintz W.D., 1969, A&A 1, 249 (=1969A&A.....1..249H)
Johnson H.L. & Knuckles C.F., 1955, ApJ, 122, 209 (=1955ApJ...122..209J)
Johnson H.L. et al., 1968, Astrophys. J., 136, 75 (=1968ApJ...136...75J)
Mason B.D. et al., 1993, Astron. J., 105, 220 (=1993AJ....105..220M)
Mermilliod J.-C., 1976, A&AS, 24, 159 (=1976A&AS...24..159M)
Peterson D.M. & Solenski R., 1987, ApJ, 315, 286 (=1987ApJ...315..286P)
Schiller S.J. & Milone E.F., 1987, Astron. J., 93, 1471
(=1987AJ.....93.1471S)
Schmidt-Kaler's T., 1982, in Landolt-Boernstein, Vol 2b,
eds. K. Schaifers, H.H. Voig. springer, Heildelberg
Schwan H., 1991, Astron. Astrophys., 243, 386 (=1991A&A...243..386S)
Stern R.A., 1994, private communication
Strassmeier K.G. et al., 1993, A&AS, 100, 173 (= Catalogue <V/76>)
Thorburn J.A. et al., 1993, Astrophys. J., 415, 150 (=1993ApJ...415..150T)
van Altena W.F., 1969, Astron. J., 74, 2 (=1969AJ.....74....2V)
van Bueren H.G., 1952, Bull. Astron. Inst. Netherlands, 11, 385
(=1952BAN....11..385V)
Wickes W.C., 1975, Astron. J., 80, 1059 (=1975AJ.....80.1059W)
Courtesy: D. Barrado y Navascues <dbarrado@cfa.harvard.edu>
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(End) Patricia Bauer [CDS] 09-Feb-1996