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J/ApJ/697/1103        Kinematics of Orion Nebula Cluster          (Tobin+, 2009)

Kinematics of the Orion Nebula Cluster: velocity substructure and spectroscopic binaries. Tobin J.J., Hartmann L., Furesz G., Mateo M., Megeath S.T. <Astrophys. J., 697, 1103-1118 (2009)> =2009ApJ...697.1103T
ADC_Keywords: Binaries, spectroscopic ; Radial velocities ; Clusters, open Keywords: stars: formation Abstract: We present a kinematic study of the Orion Nebula Cluster (ONC) based upon RVs measured by multifiber echelle spectroscopy at the 6.5m MMT and Magellan telescopes. Velocities are reported for 1613 stars, with multi-epoch data for 727 objects as part of our continuing effort to detect and analyze spectroscopic binaries (SBs). We confirm and extend the results of Furesz et al. (2008, Cat. J/ApJ/676/1109), showing that the ONC is not relaxed, consistent with its youth, and that the stars generally follow the position-velocity structure of the moderate density gas in the region, traced by 13CO. The additional RVs we have measured enable us to probe some discrepancies between stellar and gaseous structure which can be attributed to binary motion and the inclusion of nonmembers in our kinematic sample. Our multi-epoch data allow us to identify 89 SBs; more will be found as we continue monitoring. Our results reinforce the idea that the ONC is a cluster in formation, and thus provide a valuable testing ground for theory. Description: We have obtained multifiber echelle spectra using Hectochelle on the MMT, in late 2007 October (table 2), and MIKE Fibers, in 2007 January and 2008 March/April (table 1), on the Magellan Clay telescope. We took spectra around the magnesium triplet near 5200Å. This study continues the monitoring of the targets observed by Furesz et al. (2008, Cat. J/ApJ/676/1109) with the addition of ∼200 new targets from the MIKE Fibers observations. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 99 8 MIKE fibers observations table2.dat 99 5 Hectochelle observations table3.dat 124 1602 Velocity summary table4.dat 45 156 Hectochelle Field 1 velocity data table5.dat 45 135 Hectochelle Field 2 velocity data table6.dat 45 154 Hectochelle Field 3 velocity data table7.dat 62 205 MIKE Field A velocity data table8.dat 62 130 MIKE Field B velocity data table9.dat 62 193 MIKE Field C velocity data table10.dat 62 136 MIKE Field D velocity data table11.dat 164 68 Spectroscopic binaries from velocity shifts table12.dat 164 67 Spectroscopic binaries from cross-correlation
See also: II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003) J/ApJ/676/1109 : Velocities of stars in the ONC (Furesz+, 2008) J/AJ/129/363 : Spectroscopy in Orion Nebula Cluster (Sicilia-Aguilar+, 2005) J/A+A/375/130 : New PMS spectroscopic binaries in Orion (Covino+ 2001) J/AJ/121/1676 : ONC low-mass stars photometry (Rebull+, 2001) J/AJ/113/1733 : Orion Nebula Cluster population (Hillenbrand 1997) Byte-by-byte Description of file: table1.dat table2.dat
Bytes Format Units Label Explanations
1- 5 A5 --- Field Field identification: A-D for MIKE (table 1) or F for Hectochelle (table 2) 7- 16 A10 "YYYY/MM/DD" Date Date of observation 18- 24 F7.3 d JD Julian date (-2454000) 26- 27 I2 h RAh Hour of right ascension (J2000) 29- 30 I2 min RAm Minute of right ascension (J2000) 32- 36 F5.2 s RAs Second of right ascension (J2000) 38 A1 --- DE- Sign of declination (J2000) 39- 40 I2 deg DEd Degree of declination (J2000) 42- 43 I2 arcmin DEm Arcminute of declination (J2000) 45- 49 F5.2 arcsec DEs Arcsecond of declination (J2000) 51- 55 F5.3 --- AirM Air mass 57 I1 s ExpT1 Exposure time 1 58 A1 --- --- [x] 59- 62 I4 s ExpT2 Exposure time 2 64 I1 --- Binn1 Binning for exposure 1 65 A1 --- --- [x] 66 I1 --- Binn2 Binning for exposure 2 68- 71 A4 --- Filt Filter (Mg for table 1 or RV31 for table 2) 73- 77 F5.2 km/s ZPS Zero-point shift (1) 78 A1 --- f_ZPS [b] Shift applied (2) 80- 83 F4.2 km/s e_ZPS ZPS uncertainty 85- 89 F5.2 km/s ZPS2 ? Zero-point shift 2 90 A1 --- f_ZPS2 [c] Shift applied (2) 92- 95 F4.2 km/s e_ZPS2 ? ZPS2 uncertainty 97- 99 I3 --- Ntar Number of targets
Note (1): Shift applied is relative to the velocities in Furesz et al. (2008, Cat. J/ApJ/676/1109). Note (2): Flag as follows: b = Shift was applied only to spectra observed with the red channel of the MIKE spectrograph. c = Shift was applied only to spectra observed with the blue channel of the MIKE spectrograph. We only had good enough velocities for Field A to treat the blue and red spectrograph channels independently.
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 14 A14 --- 2MASS 2MASS identification (HHMMSSs+DDMMSS) 16- 17 I2 h RAh Hour of Right Ascension (J2000) 19- 20 I2 min RAm Minute of Right Ascension (J2000) 22- 27 F6.3 s RAs Second of Right Ascension (J2000) 29 A1 --- DE- Sign of the Declination (J2000) 30- 31 I2 deg DEd Degree of Declination (J2000) 33- 34 I2 arcmin DEm Arcminute of Declination (J2000) 36- 40 F5.2 arcsec DEs Arcsecond of Declination (J2000) 42- 47 F6.1 km/s HRV ? Average radial velocity (1) 49- 52 F4.1 km/s e_HRV ? Uncertainty in HRV (1) 54 I1 --- o_HRV Number of observations in HRV with R>6.0 (1) 56- 60 F5.2 mag Vmag ?=0 The V band magnitude (2) 62- 65 F4.2 mag V-I ?=0 The (V-I) color index (2) 67 I1 --- mult [1/2] Multiplicity (2 = close binary) 69-124 A56 --- Field Field identification(s) (G1)
Note (1): Velocities from Furesz et al. (2008, Cat. J/ApJ/676/1109) are included in average. For a measurement to be included in the average R must be >3.5. When o_HRV=0 (no measurement), HRV and e_HRV were set to 0. Note (2): Optical photometry from Rebull (2001, Cat. J/AJ/121/1676) and Hillenbrand (1997, Cat. J/AJ/113/1733); the photometry are not corrected for extinction.
Byte-by-byte Description of file: table[456].dat
Bytes Format Units Label Explanations
1- 14 A14 --- 2MASS 2MASS identification (HHMMSSs+DDMMSS) 16- 21 F6.1 km/s FE1-RV Hectochelle Field (1 for table 4, 2 for table 5 or 3 for table 6), Epoch 1 radial velocity 23- 25 F3.1 km/s e_FE1-RV Uncertainty in FE1-RV 27- 31 F5.1 km/s FE2-RV ? Hectochelle Field, Epoch 2 radial velocity (not for table 6) 33- 35 F3.1 km/s e_FE2-RV ? Uncertainty in FE2-RV 37- 40 F4.1 --- FE1-R Hectochelle Field, Epoch 1 Cross-correlation signal to noise 42- 45 F4.1 --- FE2-R ? Hectochelle Field, Epoch 2 Cross-correlation signal to noise (not for table 6)
Byte-by-byte Description of file: table[789].dat table10.dat
Bytes Format Units Label Explanations
1- 14 A14 --- 2MASS 2MASS identification (HHMMSSs+DDMMSS) 16- 21 F6.1 km/s E1-RV MIKE Fiber field (A for table 7, B for table 8, C for table 9 or D for table 10), Epoch 1 radial velocity 23- 25 F3.1 km/s e_E1-RV Uncertainty in 1-RV 27- 32 F6.1 km/s E2-RV ? MIKE Fiber C field, Epoch 2 radial velocity (not for table 10) 34- 36 F3.1 km/s e_E2-RV ? Uncertainty in 2-RV 38- 43 F6.1 km/s E3-RV ? MIKE Fiber field, Epoch 3 radial velocity (only for table 9) 45- 47 F3.1 km/s e_E3-RV ? Uncertainty in 3-RV 49- 52 F4.1 --- E1-R MIKE Fiber field, Epoch 1 Cross-correlation signal to noise 54- 57 F4.1 --- E2-R ? MIKE Fiber field, Epoch 2, Cross-correlation signal to noise (not for table 10) 59- 62 F4.1 --- E3-R ? MIKE Fiber field, Epoch 3, Cross-correlation signal to noise (only for table 9)
Byte-by-byte Description of file: table11.dat table12.dat
Bytes Format Units Label Explanations
1- 2 I2 h RAh Hour of right ascension (J2000) 4- 5 I2 min RAm Minute of right ascension (J2000) 7- 12 F6.3 s RAs Second of right ascension (J2000) 14 A1 --- DE- Sign of declination (J2000) 15- 16 I2 deg DEd Degree of declination (J2000) 18- 19 I2 arcmin DEm Arcminute of declination (J2000) 21- 25 F5.2 arcsec DEs Arcsecond of declination (J2000) 27- 40 A14 --- 2MASS 2MASS identification (HHMMSSs+DDMMSS) 42- 46 F5.1 km/s <RV> Average radial velocity (1) 48- 51 F4.1 km/s e_<RV> <RV> maximum uncertainty 53- 57 F5.1 km/s maxDV Maximum velocity difference between components 59- 62 F4.1 km/s e_maxDV ? maxDV uncertainty (only for table 11) 64- 70 F7.2 [-] log(P) ? χ2 probability (only for table 11) 72- 78 F7.2 --- chi2 ? Reduced χ2 of RV (only for table 11) 80 I1 --- Nobs Number of observations with R>4.5 (for table 11) or R>6.0 (for table 12) 82- 86 F5.2 mag Vmag ?=0 V-band magnitude (2) 88- 91 F4.2 mag V-I ?=0 V-I color index (2) 93- 97 F5.2 mag Ksmag 2MASS Ks-band magnitude 99-103 F5.2 mag Ks-[3.6] ?=0 Ks-3.6um IRAC band color index 105 I1 --- SB [1/2] 1 for single-line binary (SB1) or 2 for double-line binary (SB2) 107 I1 --- q_SB [1/2]? 1: High confidence in detection or 2: moderate confidence (only for table 12) 109-164 A56 --- Field Field identification(s) (G1)
Note (1): Velocities from Furesz et al. (2008, Cat. J/ApJ/676/1109) are included in the average. For a measurement to be included in the average R must be >4.5 (for table 11) or >6.0 (for table 12). Note (2): Optical photometry from Rebull (2001, Cat. J/AJ/121/1676) and Hillenbrand (1997, Cat. J/AJ/113/1733); the photometry are not corrected for extinction.
Global notes: Note (G1): F11, F21, F22, F31, S3, S2, S1 correspond to observations presented in Furesz et al. (2008, Cat. J/ApJ/676/1109): -------------------------------------------------------------------------- Date ID Field Center Exposures Binning Mode Number of Targets -------------------------------------------------------------------------- 2004/12/01 F11 5 35 19 -04 49 27 3x20 min 1x1 224 2004/12/01 F21 5 35 13 -05 21 14 3x20 min 1x1 210 2004/12/01 F22 5 35 13 -05 21 14 3x20 min 1x1 219 2004/12/01 F31 5 35 26 -06 07 30 3x20 min 1x1 213 2005/11/15 S3 5 35 13 -05 33 10 3x15 min 2x2 161 2005/11/15 S2 5 35 11 -05 07 28 3x15 min 2x2 154 2005/11/15 S1 5 35 21 -05 18 50 3x15 min 2x2 170 --------------------------------------------------------------------------
History: From electronic version of the journal References: Furesz et al. Paper I. 2008ApJ...676.1109F Cat. J/ApJ/676/1109
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 30-May-2011
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