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J/AJ/134/2272     Visual binaries in the Orion Nebula Cluster  (Reipurth+, 2007)

Visual binaries in the Orion Nebula Cluster. Reipurth B., Guimaraes M.M., Connelley M.S., Bally J. <Astron. J., 134, 2272-2285 (2007)> =2007AJ....134.2272R
ADC_Keywords: Clusters, open ; Stars, double and multiple ; Stars, pre-main sequence Keywords: binaries: visual - open clusters and associations: individual (Orion Nebula Cluster) - stars: low-mass, brown dwarfs - stars: pre-main sequence - techniques: high angular resolution Abstract: We have carried out a major survey for visual binaries toward the Orion Nebula Cluster, using images obtained with the Advanced Camera for Surveys on the Hubble Space Telescope through an Halpha filter. From 1051 stars more than 60" from theta1 Ori C, we have selected 781 that fulfill the criteria for membership in the Orion Nebula Cluster. Among these, we find 78 multiple systems (75 binaries and 3 triples), of which 55 are new discoveries, in the range from 0.1" to 1.5". We perform a statistical study of the 72 binaries and 3 triples that have separations in the limited range 0.15" to 1.5", within which we need no incompleteness correction. Description: The present survey is based on our recent study of the Orion Nebula using the Wide Field Channel of the Advanced Camera for Surveys (ACS) onboard HST. During program GO-9825, we observed 26 ACS fields with the F658N (Hα+[NII]) filter and an exposure time of 500s per pointing. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 96 78 Pre-main sequence binaries with angular separation between 0.15 and 1.5 arcseconds, outside the 60" exclusion zone around θ1 Ori C table2.dat 96 13 Other binaries with angular separations <1.5" toward the ONC
See also: II/171 : Parenago Catalog of Stars in Orion Nebula (Parenago 1954) B/gcvs : General Catalogue of Variable Stars (Samus+ 2007-2010) J/AJ/113/1733 : Orion Nebula Cluster population (Hillenbrand 1997) J/AJ/117/1375 : Orion Trapezium cluster (Simon+, 1999) J/ApJS/160/319 : COUP: observations and source lists (Getman+, 2005) J/MNRAS/361/211 : JHK photometry of brown dwarfs in Orion (Lucas+, 2005) J/A+A/458/461 : Binary stars in the Orion Nebula Cluster (Koehler+, 2006) Byte-by-byte Description of file: table[12].dat
Bytes Format Units Label Explanations
1- 3 I3 --- JW ? Jones & Walker (1988AJ.....95.1755J) identification number 5- 6 I2 % Mpm ? Membership probability from proper motion 8- 11 I4 --- Par ? Parenago (Cat. II/171) identification, Parenago NNNN in Simbad 13- 17 A5 --- GCVS GCVS (Cat. B/gcvs) identification 19- 22 I4 --- COUP ? COUP (Cat. J/ApJS/160/319) identification 24- 28 A5 --- [H97b] Hillenbrand (1997, Cat. J/AJ/113/1733) identification 30 I1 h RAh Hour of Right Ascension (J2000) 32- 33 I2 min RAm Minute of Right Ascension (J2000) 35- 38 F4.1 s RAs Second of Right Ascension (J2000) 40 A1 --- DE- Sign of the Declination (J2000) 41 I1 deg DEd Degree of Declination (J2000) 43- 44 I2 arcmin DEm Arcminute of Declination (J2000) 46- 47 I2 arcsec DEs Arcsecond of Declination (J2000) 49- 51 I3 deg PA System position angle 53- 56 F4.2 arcsec Sep System separation 58- 62 F5.2 mag Imag ? Apparent I band magnitude 64 A1 --- l_dHa Limit flag on dHa (1) 65- 68 F4.1 mag dHa Difference in Hα band magnitudes 70- 72 I3 deg PAOriC Position angle toward θ1 Ori C 74- 76 I3 arcsec SepOriC Separation from θ1 Ori C 78- 81 A4 --- SpT Spectral type from SIMBAD 83- 86 A4 --- Memb [PXHV ] Membership criteria (2) 88- 94 A7 --- Bin [a-f,] Binary discovery paper code (3) 96 I1 --- Desc [1,3]? Binary description (4)
Note (1): Indicates that the primary is saturated (sometimes both stars), thus Δm is only an approximation. Note (2): Letter used for membership criteria: P = proper motion catalog by Jones & Walker (1988AJ.....95.1755J) with probability ≥93% X = COUP source by Getman et al. (2005, Cat. J/ApJS/160/319) H = Hα emission (Pettersson et al., in prep.) V = variability noted by the General Catalog of Variable Stars, (Cat. B/gcvs) Note (3): Binary discovery paper code as follows: a = Prosser et al. (1994ApJ...421..517P) b = Padgett et al. (1997ApJ...477..705P) c = Simon et al. (1999, Cat. J/AJ/117/1375) d = Koehler et al. (2006, Cat. J/A+A/458/461) e = Getman et al. (2005, Cat. J/ApJS/160/319) f = Lucas et al. (2005, Cat. J/MNRAS/361/211) Note (4): Binary description as follows: 1 = Binary with angular separation <0.4" inside the exclusion zone 2 = Binary with angular separation <0.15" outside the exclusion zone 3 = Binary with angular separation <1.5" outside the exclusion zone but with no evidence of ONC membership
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 10-Feb-2010
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