J/A+A/394/151 Multiplicity among chemically peculiar stars II (Carrier+, 2002)
Multiplicity among chemically peculiar stars.
II. Cool magnetic Ap stars.
Carrier F., North P., Udry S., Babel J.
<Astron. Astrophys. 394, 151 (2002)>
=2002A&A...394..151C 2002A&A...394..151C
ADC_Keywords: Stars, Ap ; Binaries, spectroscopic ; Radial velocities
Keywords: stars, chemically peculiar - stars: spectroscopic binaries -
stars: fundamental parameters
Description:
We present new orbits for sixteen Ap spectroscopic binaries, four of
which might in fact be Am stars, and give their orbital elements. Four
of them are SB2 systems: HD 5550, HD 22128, HD 56495 and HD 98088. The
twelve other stars are : HD 9996, HD 12288, HD 40711, HD 54908,
HD 65339, HD 73709, HD 105680, HD 138426, HD 184471, HD 188854,
HD 200405 and HD 216533. Rough estimates of the individual masses of
the components of HD 65339 (53 Cam) are given, combining our radial
velocities with the results of speckle interferometry and with
Hipparcos parallaxes. Considering the mass functions of 74
spectroscopic binaries from this work and from the literature, we
conclude that the distribution of the mass ratio is the same for cool
Ap stars as for normal G dwarfs. Therefore, the only differences
between binaries with normal stars and those hosting an Ap star lie in
the period distribution: except for the case of HD 200405, all orbital
periods are longer than (or equal to) 3 days. A consequence of this
peculiar distribution is a deficit of null eccentricities. There is no
indication that the secondary has a special nature, like e.g. a white
dwarf.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
stars.dat 60 164 Star positions (from Simbad)
table1.dat 60 1913 Individual RVs and correlation dip parameters
table2.dat 98 123 Average RVs, Vsini upper limits, P(chi2) etc.
table3.dat 48 48 Ap stars showing no CORAVEL dip
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See also:
III/162 : General Catalogue of Ap and Am stars (Renson+ 1991)
III/199 : Observed Periods of Ap and Bp stars (Catalano+ 1998)
J/A+AS/130/223 : Multiplicity among chemically peculiar stars. I (North+, 1998)
J/A+A/385/488 : Search for duplicity in periodic Be stars (Carrier+, 2002)
Byte-by-byte Description of file: stars.dat
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Bytes Format Units Label Explanations
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1- 2 A2 --- --- [HD]
4- 9 I6 --- HD HD number (Cat. III/135)
14- 15 I2 h RAh Right ascension (J2000)
17- 18 I2 min RAm Right ascension (J2000)
20- 23 F4.1 s RAs Right ascension (J2000)
25 A1 --- DE- Declination sign (J2000)
26- 27 I2 deg DEd Declination (J2000)
29- 30 I2 arcmin DEm Declination (J2000)
32- 33 I2 arcsec DEs Declination (J2000)
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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- 6 I6 --- HD HD number
9- 19 F11.3 d HJD Heliocentric Julian Date
21 I1 --- Comp [1/2] Component in a binary.
1: primary, 2: secondary
23- 29 F7.2 km/s RV Radial velocity
31- 35 F5.2 km/s e_RV Estimated standard deviation of one RV
measurement
38- 42 F5.3 --- PR Relative depth of the correlation dip (1)
44- 48 F5.3 --- e_PR Standard deviation on the relative depth (1)
50- 54 F5.2 km/s XL Width of the correlation dip (1)
56- 59 F4.2 km/s e_XL Standard deviation on the width (1)
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Note (1): undefined if 0.00 or 9.99
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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 --- HD HD number
8 A1 --- Comp [ab] Component in a binary.
a: primary, b: secondary
10- 14 A5 --- Rns Renson number (Cat. III/162)
16- 26 A11 --- ST Spectral type
28- 32 F5.2 mag B-V Johnson's B-V index
34- 39 F6.2 km/s RV Mean radial velocity
41- 44 F4.2 km/s e_RV Standard deviation on the mean RV
46- 49 F4.2 km/s SCAT External scatter (sigma) of the RV values
51- 55 F5.2 --- E/I Ratio of external to internal errors
57- 59 I3 --- Nmeas Number of CORAVEL measurements used in the
statistics (= total number of measurements,
except for some binary components)
61- 64 I4 d SPAN Time span of the CORAVEL measurements
66- 69 F4.1 km/s Vsini Upper limit to vsini
71- 74 F4.1 km/s e_Vsini ?=99.9 Standard deviation on Vsini
76- 80 F5.3 --- P(chi2) ?=9.999 Probability of no intrinsic RV variation
82- 98 A17 --- Rem Remark (1)
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Note (1): Remarks:
NC98 = North et al. (1998, Cat. J/A+AS/130/223)
M98 = Mkrtichian et al. (1998CoSka..27..238M 1998CoSka..27..238M)
N48 = Northcott (1948AJ.....53..116N 1948AJ.....53..116N)
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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 --- HD HD number
7 A1 --- Comp [A] Component in a visual double. A: primary
9- 13 A5 --- Rns Renson number
15- 25 A11 --- SpType Spectral type
27- 48 A22 --- Rem Remark
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Acknowledgements: Fabien Carrier
References:
North et al., Paper I 1998A&AS..130..223N 1998A&AS..130..223N, Cat. J/A+AS/130/223
(End) Patricia Bauer [CDS] 05-Aug-2002