Access to Astronomical Catalogues

← Click to display the menu
J/MNRAS/416/817  RV catalog of O-type stars in IC 2944 and Cen OB2 (Sana+, 2011)

The massive star binary fraction in young open clusters. III. IC 2944 and the Cen OB2 association. Sana H., James G., Gosset E. <Mon. Not. R. Astron. Soc. 416, 817 (2011)> =2011MNRAS.416..817S
ADC_Keywords: Clusters, open ; Binaries, spectroscopic ; Radial velocities ; Stars, O Keywords: binaries: close - binaries: spectroscopic - binaries: general - stars: early-type - open clusters and associations: individual: (IC 2944, Cen OB2) Abstract: Using an extended set of multi-epoch high resolution high signal-to-noise ratio optical spectra, we re-address the multiplicity properties of the O-type stars in IC 2944 and in the Cen OB2 association. We present new evidence of binarity for five objects and we confirm the multiple nature of another two. We derive the first orbital solutions for HD 100099, HD 101436 and HD 101190 and we provide additional support for HD 101205 being a quadruple system. The minimal spectroscopic binary fraction in our sample is fmin=0.57. Using numerical simulations, we show that the detection rate of our observational campaign is close to 90%, leaving thus little room for undetected spectroscopic binary systems. The statistical properties of the O-star population in IC 2944 are similar, within the uncertainties, to the results obtained in the earlier papers in this series despite the fact that sample size effects limit the significance of the comparison. Using newly derived spectroscopic parallaxes, we reassess the distance to IC 2944 and obtained 2.3±0.3kpc, in agreement with previous studies. We also confirm that, as far as the O stars are concerned, the IC 2944 cluster is most likely a single entity. Description: Journal of the spectroscopic observations of the IC2944/Cen OB2 O-type stars studied in the present paper. The two header lines indicate the considered spectral lines and the adopted rest wavelength (in Angstroms). The first column indicates the object considered. The second and third ones gives the heliocentric Julian dates at mid-exposure and the code of the instrumental setup. The following columns provide the heliocentric RVs (expressed in km/s) using various spectral lines. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file stars.dat 57 12 Star list table2.dat 134 153 Radial velocity data for O stars in IC2944/Cen OB2
See also: J/MNRAS/386/447 : RV catalogue of O-type stars in NGC 6231 (Sana+, 2008) J/MNRAS/400/1479 : RV catalogue of O-type stars in NGC 6611 (Sana+, 2009) Byte-by-byte Description of file: stars.dat
Bytes Format Units Label Explanations
1- 11 A11 --- Name Star name 13- 14 I2 h RAh Simbad Hour of Right Ascension (J2000.0) 16- 17 I2 min RAm Simbad Minute of Right Ascension (J2000.0) 19- 22 F4.1 s RAs Simbad Second of Right Ascension (J2000.0) 24 A1 --- DE- Simbad Sign of the Declination (J2000.0) 25- 26 I2 deg DEd Simbad Degree of Declination (J2000.0) 28- 29 I2 arcmin DEm Simbad Arcminute of Declination (J2000.0) 31- 32 I2 arcsec DEs Simbad Arcsecond of Declination (J2000.0) 34- 38 F5.2 mag Bmag Simbad B band magnitude 40- 44 F5.2 mag Vmag Simbad V band magnitude 46- 55 A10 --- SpType Simbad MK spectral type 57 A1 --- Note [*] * indicates that values are for the pair, not for individual components
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 11 A11 --- Name Object Identifier 12 A1 --- m_Name [ps] Component (primary/secondary) 14- 24 F11.3 d HJD Heliocentric Julian Date 26 A1 --- Inst Instrument Setup Code (1) 28- 34 F7.2 km/s HeI4026 ?=- RV measured on HeI4026 (r.w. 4026.072)(2) 35 A1 --- u_HeI4026 Uncertainty flag on HeI4026 37- 43 F7.2 km/s SiIV4089 ?=- RV measured on SiIV4089 (r.w. 4088.863)(2) 45- 51 F7.2 km/s HeI4144 ?=- RV measured on HeI4144 (r.w. 4143.759)(2) 52 A1 --- u_HeI4144 Uncertainty flag on HeI4144 54- 60 F7.2 km/s HeII4200 ?=- RV measured on HeI4388 (r.w. 4199.830)(2) 62- 68 F7.2 km/s HeI4388 ?=- RV measured on HeI4471 (r.w. 4387.928)(2) 70- 76 F7.2 km/s HeI4471 ?=- RV measured on MgII4481 (r.w. 4471.512)(2) 78- 84 F7.2 km/s MgII4481 ?=- RV measured on HeII4542 (r.w. 4481.228)(2) 86- 92 F7.2 km/s HeII4542 ?=- RV measured on HeII5686 (r.w. 4541.590)(2) 94-100 F7.2 km/s HeII4686 ?=- RV measured on HeI4921 (r.w. 4685.682)(2) 102-108 F7.2 km/s HeI4921 ?=- RV measured on HeII5412 (r.w. 4921.929)(2) 109 A1 --- u_HeI4921 Uncertainty flag on HeI4921 111-117 F7.2 km/s HeII5412 ?=- RV measured on HeI5876 (r.w. 5411.620)(2) 119-125 F7.2 km/s HeI5876 ?=- RV measured on HeI7065 (r.w. 5875.620)(2) 126 A1 --- u_HeI5876 Uncertainty flag on HeI5876 128-134 F7.2 km/s HeI7065 ?=- RV measured on HeI7065 (r.w. 7065.190)(2)
Note (1): Instrument Code as follows: a = ESO2.2m + FEROS b = VLT + UVES Note (2): r.w.: rest wavelength (in Angstroms), adopted to compute the RVs
Acknowledgements: Hugues Sana, H.Sana(at) References: Sana et al., Paper I, 2008MNRAS.386..447S, Cat. J/MNRAS/386/447 Sana et al., Paper II, 2009MNRAS.400.1479S, Cat. J/MNRAS/400/1479
(End) Hugues Sana [UvA, NL], Patricia Vannier [CDS] 04-Apr-2011
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

catalogue service