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J/A+A/430/137    Close visual companions in Scorpius OB2    (Kouwenhoven+, 2005)

The primordial binary population. I. A near-infrared adaptive optics search for close visual companions to A star members of Scorpius OB2. Kouwenhoven M.B.N., Brown A.G.A., Zinnecker H., Kaper L., Portegies Zwart S.F. <Astron. Astrophys., 430, 137-154 (2005)> =2005A&A...430..137K
ADC_Keywords: Stars, double and multiple ; Photometry, infrared Keywords: binaries: visual - binaries: general - stars: formation - associations: individual: Sco OB2 Abstract: We present the results of a near-infrared adaptive optics survey with the aim to detect close companions to Hipparcos members in the three subgroups of the nearby OB association Sco OB2: Upper Scorpius (US), Upper Centaurus Lupus (UCL) and Lower Centaurus Crux (LCC). We have targeted 199 A-type and late B-type stars in the K_S band, and a subset also in the J and H band. We find 151 stellar components other than the target stars. A brightness criterion is used to separate these components into 77 background stars and 74 candidate physical companion stars. Out of these 74 candidate companions, 41 have not been reported before (14 in US; 13 in UCL; 14 in LCC). Description: The observations were performed with the ADONIS/ SHARPII+ system n the ESO 3.6 meter telescope at La Silla, Chile. Our observing campaign was carried out in two periods: a period from May 31 to June 4, 2000, and one from June 5 to 9, 2001. Table1 lists results from the ADONIS adaptive optics survey among 199 Sco OB2 member stars. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 72 348 Results from the ADONIS adaptive optics survey among 199 Sco OB2 member stars
Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 3 A3 --- --- [HIP] 4- 8 I5 --- HIP Hipparcos number of target (primary) star (1) 12- 16 F5.2 mag Jmag ? J magnitude of the observed star 20- 24 F5.2 mag Hmag ? H magnitude of the observed star 28- 32 F5.2 mag Ksmag ? Ks magnitude of the observed star 34- 44 A11 --- SpType Primary (target) star MK spectral type 48- 52 F5.2 arcsec rho ? Angular separation between target and observed stars 56- 61 F6.2 deg PA ? Position angle, measured from North to East, between target and observed stars 63- 64 A2 --- status [pcnb ] Status of the observed star (2) 66- 68 A3 --- subg Subgroup of target (primary) star (3) 71- 72 A2 --- Rem [JH ] JH: observing conditions were not photometric
Note (1): The Hipparcos member stars HIP 77315 and HIP 77317 are a common proper motion pair (see the Double Star Catalog, Cat. I/237). Here, the two stars are treated as separate primaries and not as one system. Note (2): Status is coded as follows: p = primary/single, target star c = companion n = new b = background Note (3): Subgroups use the following abbreviations: US = Upper Scorpius LCC = Upper Centaurus Lupus UCL = Lower Centaurus Crux
Acknowledgements: M.B.N. Kouwenhoven, kouwenho(at)science.uva.nl
(End) Patricia Vannier [CDS] 03-Feb-2005
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