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J/A+A/515/A75  Low-mass population in ρ Oph cloud (Alves de Oliveira+, 2010)

The low-mass population of the rho Ophiuchi molecular cloud. Alves de Oliveira C., Moraux E., Bouvier J., Bouy H., Marmo C., Albert L. <Astron. Astrophys. 515, A75 (2010)> =2010A&A...515A..75A
ADC_Keywords: Molecular clouds ; YSOs ; Photometry, infrared ; Photometry, millimetric/submm Keywords: stars: formation - stars: low-mass - brown-dwarf - planetary system Abstract: Star formation theories are currently divergent regarding the fundamental physical processes that dominate the substellar regime. Observations of nearby young open clusters allow the brown dwarf (BD) population to be characterised down to the planetary mass regime, which ultimately must be accommodated by a successful theory. We used near-IR deep images (reaching completeness limits of approximately 20.5mag in J, and 18.9mag in H and Ks taken with the Wide Field IR Camera (WIRCam) at the Canada France Hawaii Telescope (CFHT) to identify candidate members of ρ Oph in the substellar regime. A spectroscopic follow-up of a small sample of the candidates allows us to assess their spectral type, and subsequently their temperature and membership. We select 110 candidate members of the ρ Ophiuchi molecular cloud, from which 80 have not previously been associated with the cloud. We observed a small sample of these and spectroscopically confirm six new brown dwarfs with spectral types ranging from M6.5 to M8.25. Description: List of the substellar candidate members in ρ Ophiuchi identified with our near-IR survey. If available, the following information is also provided, optical and/or mid-IR photometry, spectral type and Av as determined from this study, photometric properties such as detection of IR excess, and references for the sources previously associated with the cluster in the literature. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table4.dat 210 110 List of substellar candidate members in ρ Oph
See also: J/ApJ/438/813 : Stellar population in ρ Oph cloud core (Strom+, 1995) J/ApJS/112/109 : Rho Oph Near-IR Positions and Photometry (Barsony+, 1997) J/A+A/359/113 : X-ray and IR study of Rho Oph dark cloud (Grosso+, 2000) J/A+A/372/173 : ISOCAM observations of rho Ophiuchi cloud (Bontemps+, 2001) J/PASJ/55/653 : Chandra X-ray flares in rho Ophiuchi (Imanishi+, 2003) J/A+A/426/171 : H2 flows in rho Ophiuchi A (Khanzadyan+, 2004) J/ApJ/613/393 : X-ray and radio sources in ρ Oph Core A (Gagne+, 2004) J/AJ/130/1733 : Optical spectroscopy of ρ Oph stars (Wilking+, 2005) J/ApJ/630/381 : Mid-IR imaging in ρ Oph (Barsony+, 2005) J/A+A/429/963 : XMM-Newton observation of the rho Oph cloud (Ozawa+, 2005) J/A+A/430/549 : C18O/C17O near rho Oph (Wouterloot+, 2005) J/A+A/447/609 : 1.2mm continuum observations in rho Oph cloud (Stanke+, 2006) J/A+A/452/245 : Near-IR photometry of PMS stars in rho Oph (Natta+, 2006) J/A+A/485/155 : HK photometry of rho Oph PMS stars (Alves de Oliveira+, 2008) Byte-by-byte Description of file: table4.dat
Bytes Format Units Label Explanations
1- 11 A11 --- --- [CFHTWIR-Oph] 13- 15 I3 --- Seq [1/110] Substellar candidate name, CFHTWIR-Oph NNN 17- 18 I2 h RAh Right Ascension (J2000) 20- 21 I2 min RAm Right Ascension (J2000) 23- 27 F5.2 s RAs Right Ascension (J2000) 29 A1 - DE- Declination sign (J2000) 30- 31 I2 deg DEd Declination (J2000) 33- 34 I2 arcmin DEm Declination (J2000) 36- 39 F4.1 arcsec DEs Declination (J2000) 41- 45 F5.2 mag i'mag ? Aperture photometry i' from PrimeCam/Subaru 47- 50 F4.2 mag e_i'mag ? i'mag photometric error 52- 56 F5.2 mag z'mag ? Aperture photometry z' from PrimeCam/Subaru 58- 61 F4.2 mag e_z'mag ? z'mag photometric error 63- 67 F5.2 mag Jmag ? PSF photometry J magnitude from WIRCam/CFHT 69- 72 F4.2 mag e_Jmag ? Jmag photometric error 74- 78 F5.2 mag Hmag ? PSF photometry H magnitude from WIRCam/CFHT 80- 83 F4.2 mag e_Hmag ? Hmag photometric error 85- 89 F5.2 mag Ksmag ? PSF photometry Ks magnitude from WIRCam/CFHT 91- 94 F4.2 mag e_Ksmag ? Ksmag photometric error 96-100 F5.2 mag [3.6] ? IRAC 3.6um magnitude as retrieved from the NASA/IPAC Infrared Science Archive 102-105 F4.2 mag e_[3.6] ? [3.6] photometric error 107-111 F5.2 mag [4.5] ? IRAC 4.5um magnitude as retrieved from the NASA/IPAC Infrared Science Archive 113-116 F4.2 mag e_[4.5] ? [4.5] photometric error 118-122 F5.2 mag [5.4] ? IRAC 5.4um magnitude as retrieved from the NASA/IPAC Infrared Science Archive 124-127 F4.2 mag e_[5.4] ? [5.4] photometric error 129-133 F5.2 mag [8.0] ? IRAC 8.0um magnitude as retrieved from the NASA/IPAC Infrared Science Archive 135-138 F4.2 mag e_[8.0] ? [8.0] photometric error 140-144 F5.2 mag [24] ? MIPS 24um magnitude as retrieved from the NASA/IPAC Infrared Science Archive 146-149 F4.2 mag e_[24] ? [24] photometric error 151-155 A5 --- SpT MK spectral type as determined in this study 157-160 F4.2 mag AV ? AV as determined in this study 162-170 A9 --- Ref References for ρ Ophiuchi members, according to these studies (1) 172-186 A15 --- Flag Properties of the candidate members (2) 188-210 A23 --- OName Simbad Name
Note (1): ρ Ophiuchi members, according to the following studies: 1 = Bontemps et al. (2001, Cat. J/A+A/372/173) 2 = Comeron et al. (1993ApJ...416..185C) 3 = Greene et al. (1992ApJ...395..516G) 4 = Gutermuth et al. (2009, Cat. J/ApJS/184/18) 5 = Strom et al. (1995, Cat. J/ApJ/438/813) 6 = Wilking et al. (1983ApJ...274..698W) 7 = Wilking et al. (1989ApJ...340..823W) 8 = Wilking et al. ( Note (2): Properties flags as follows: ex1 = mid-IR excess ex2 = mid-IR excess var = Variability AGN = Possible Active Galactic Nuclei Contaminant R = red spectrum
Acknowledgements: Catarina Alves de Oliveira, Catarina.Oliveira(at)
(End) Patricia Vannier [CDS] 19-Apr-2010
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