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J/A+A/315/384       Binarity among B-stars in NGC 6231 (Raboud, 1996)

Binarity among B-stars in NGC 6231 Raboud D. <Astron. Astrophys. 315, 384 (1996)> =1996A&A...315..384R (SIMBAD/NED BibCode)
ADC_Keywords: Binaries, spectroscopic ; Radial velocities Keywords: cluster: open: individual: NGC 6231 - technique: radial velocities - binary: general; spectroscopic Description: We have measured radial velocities for 53 B-type stars, between B1 and B9, in the young open cluster NGC 6231 through a cross-correlation technique with synthetic spectra. Two measurements for 36 stars of the sample were obtained with a time separation of about two years. We derived a minimum binary fraction of 52% in the considered population. The velocity determination precisions were simulated and we analysed their dependence upon the S/N ratios of the spectra and upon the stellar rotational velocities. We discuss the selection of the templates for the correlation. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table3 144 97 Results for all programme stars
Byte-by-byte Description of file: table3
Bytes Format Units Label Explanations
1- 4 I4 --- Number []? Star number from Seggewiss (1968VeBon..79....1S) 13- 18 F6.3 mag Vmag []? V magnitude 24- 28 F5.3 mag [B-V] []? Color index 34- 38 I5 K Teff []? Effective temperature calculated (1) 40- 42 A3 --- n_Teff Remark on Teff determination (2) 47- 49 I3 km/s Vsini []? Rough determination of Vsini (3) 56- 58 A3 --- r_Teff Source of the photometry and Teff (4) 71- 81 F11.3 --- JD Julian Date of the observation 90- 94 F5.1 km/s RV []? Radial velocities 97-100 A4 --- n_RV SBII characteristic of the star (5) 103-105 F3.1 km/s e_RV []? Radial velocity uncertainties (6) 113-117 F5.1 km/s RVdiff1 []? Radial velocity differences (7) 120-123 F4.1 km/s RVdiff2 []? Radial velocity differences (7) 129-133 F5.1 km/s RVdiff3 []? Radial velocity differences (8) 136-139 F4.1 km/s RVdiff4 []? Radial velocity differences (8)
Note (1): See Sect. 3.2.1 of the paper. Note (2): The question mark in brackets indicates that the determination is possibly outside the validity range of the Q parameter (see Sect. 3.2.1). Note (3): See Sect. 3.2.2. Note (4): GE is for the Geneva photometry, pe for UBV photoelectric and pg for UBV photographic photometry. The digits have the following significations: 1 = Teff from Spectral Type estimated from equivalent widths (Didelon 1982A&AS...50..199D) 2 = V and [B-V] from Garrison & Schild (1979AJ.....84.1020G), Teff from Van Genderen et al. (1984A&AS...58..537V) 3 = Seggewiss (1968VeBon..79....1S) 4 = V and [B-V] from Seggewiss (1968VeBon..79....1S), Teff calculated from uvby photometry (Shobbrook 1983MNRAS.205.1229S) 5 = Garrison & Schild (1979AJ.....84.1020G) 6 = V and [B-V] from Garrison & Schild (1979AJ.....84.1020G), Teff calculated from uvby photometry (Shobbrook 1983MNRAS.205.1229S) 7 = V and [B-V] from Geneva photometry, Teff from Spectral Type (Kilian et al. 1994A&A...284..437K) and Vsini from Kilian et al. (1994A&A...284..437K) 8 = V and [B-V] from Garrison & Schild (1979AJ.....84.1020G), Teff from Spectral Type (Garrison & Schild 1979AJ.....84.1020G) 9 = Heske & Wendker (1984A&AS...57..205H) Note (5): See Sect. 6.1.4. Note (6): Radial velocity uncertainties, obtained from the simulations described in Sect. 4, using a fixed B1 synthetic spectrum for all cases, and adapted in order to reproduce exactly the conditions of the radial velocity determinations for the two runs (i.e. without the region between 430 nm and 440 nm, see Sect. 3.3). Note (7): Differences between radial velocities of column RV. Note (8): Differential radial velocities obtained without any template (see text).
Acknowledgements: Didier Raboud
(End) Raboud [University of Lausanne], Patricia Bauer [CDS] 14-May-1996
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