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J/A+A/507/227       NGC 7129 pre-main sequence stars         (Stelzer+, 2009)

A Chandra and Spitzer census of the young star cluster in the reflection nebula NGC 7129. Stelzer B., Scholz A. <Astron. Astrophys., 507, 227-240 (2009)> =2009A&A...507..227S
ADC_Keywords: X-ray sources ; Infrared sources ; YSOs ; Stars, pre-main sequence ; Photometry, infrared Keywords: X-rays: stars - infrared: stars - stars: pre-main sequence - stars: formation Abstract: The reflection nebula NGC 7129 has long been known to be a site of recent star formation as shown, e.g., by the presence of deeply embedded protostars and HH objects. However, studies of the stellar population produced in the star formation process have remained rudimentary. A major step forward has been made with recent Spitzer imaging of the region. This study represents the next step towards a systematic assessment of the pre-main sequence population in NGC 7129. Completeness of the pre-main sequence sample is necessary for studying key features that allow the star-forming process to be understood, such as disk evolution, dynamical evolution, and mass function. At a presumed age of ∼3Myr, NGC 7129 is in the critical range where disks around young stars disappear. Description: We make use of X-ray and IR imaging observations to identify the pre-main sequence stars in NGC 7129. We define a sample of young stellar objects based on color-color diagrams composed from IR photometry between 1.6 and 8um, from 2MASS and Spitzer, and based on X-ray detected sources from a Chandra observation. A 22ks long Chandra observation targeting the Herbig star SVS 12 was carried out on Mar 11, 2006 (start of observation UT 14h29m18s). File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 75 59 X-ray parameters for all detected sources table3.dat 38 59 Identification and offset between X-ray and optical/IR position for counterparts of X-ray sources table4.dat 130 59 Photometry and YSO classification for optical and IR counterparts of X-ray sources table5.dat 63 46 X-ray upper limits and 2MASS counterparts for Class I sources not detected in X-rays table6.dat 142 46 Candidate YSOs without X-ray emission selected on basis of their IR photometry
See also: B/chandra : The Chandra Archive Log (CXC, 1999-) II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003) Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 9 A9 --- --- [NGC 7129-] 10- 15 A6 --- ID Source name (SN-XN) (G1) 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- 43 F3.1 arcmin Offax Off-axis angle 45- 49 I5 s Exp Exposition time 51- 54 F4.1 10-3ct/s CRate Count rate in X-ray band (0.3-10keV) 56- 58 F3.1 10-3ct/s e_CRate rms uncertainty on CRate 60- 64 F5.1 --- Signi Significance 66- 70 F5.1 --- S/N Signal-to-noise ratio 72- 75 F4.1 [10-7W] logLX ?=- X-ray luminosity (1)
Note (1): The X-ray luminosities were computed using the kT and NH obtained from the hardness ratios as described in Sect. 2. LX is given only for objects selected as pre-MS candidates with the criteria described in Sect. 5.
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 9 A9 --- --- [NGC 7129-] 10- 15 A6 --- ID Source name (SN-XN) (G1) 17- 26 A10 --- OName Other name 29- 32 F4.2 arcsec X-opt ?=- Offset between X-ray and optical position 35- 38 F4.2 arcsec X-2M ?=- Offset between X-ray and infrared position
Byte-by-byte Description of file: table4.dat
Bytes Format Units Label Explanations
1- 9 A9 --- --- [NGC 7129-] 10- 15 A6 --- ID Source name (SN-XNN) (G1) 17- 21 F5.2 mag Vmag ?=- V magnitude 23- 27 F5.2 mag Rmag ?=- R magnitude 29- 33 F5.2 mag Imag ?=- I magnitude 36 A1 --- l_Jmag Limit flag on Jmag 37- 41 F5.2 mag Jmag ?=- 2MASS J magnitude 43- 46 F4.2 mag e_Jmag ? rms uncertainty on Jmag 48 A1 --- l_Hmag Limit flag on Hmag 49- 53 F5.2 mag Hmag ?=- 2MASS H magnitude 55- 58 F4.2 mag e_Hmag ? rms uncertainty on Hmag 60 A1 --- l_Kmag Limit flag on Kmag 61- 65 F5.2 mag Kmag ?=- 2MASS Ks magnitude 67- 70 F4.2 mag e_Kmag ? rms uncertainty on Kmag 72- 76 F5.2 mag [3.6] ?=- Spitzer/IRAC 3.6um magnitude 78- 81 F4.2 mag e_[3.6] ? rms uncertainty on [3.6] 83- 87 F5.2 mag [4.5] ?=- Spitzer/IRAC 4.5um magnitude 89- 92 F4.2 mag e_[4.5] ? rms uncertainty on [4.5] 94- 98 F5.2 mag [5.8] ?=- Spitzer/IRAC 5.8um magnitude 100-103 F4.2 mag e_[5.8] ? rms uncertainty on [5.8] 105-109 F5.2 mag [8.0] ?=- Spitzer/IRAC 8.0um magnitude 111-114 F4.2 mag e_[8.0] ? rms uncertainty on [8.0] 116-120 F5.2 mag [24] ?=- Spitzer/MIPS 24um magnitude 122-125 F4.2 mag e_[24] ? rms uncertainty on [24] 127-129 A3 --- YSO ?=- YSO class 130 A1 --- n_YSO [*] * identify objects selected on basis of near-IR data
Byte-by-byte Description of file: table5.dat
Bytes Format Units Label Explanations
1- 9 A9 --- --- [NGC 7129-] 10- 17 A8 --- ID Source name (SN-UNNNN) (G1) 20- 21 I2 h RAh 2MASS right ascension (J2000) 23- 24 I2 min RAm 2MASS right ascension (J2000) 26- 30 F5.2 s RAs 2MASS right ascension (J2000) 32 A1 --- DE- 2MASS declination sign (J2000) 33- 34 I2 deg DEd 2MASS declination (J2000) 36- 37 I2 arcmin DEm 2MASS declination (J2000) 39- 42 F4.1 arcsec DEs Declination (J2000) 44- 46 F3.1 arcmin Offax Off-axis angle 48- 52 I5 s Exp Exposition time 54 A1 --- l_CRate Limit flag on CRate 55- 57 F3.1 10-3ct/s CRate Count rate in X-ray band (0.3-10keV) 59 A1 --- l_logLX Limit flag on logLX 60- 63 F4.1 [10-7W] logLX X-ray luminosity (1)
Note (1): The upper limits to the X-ray luminosity were computed using the median of kT and NH from the sample of X-ray detected ClassII sources. These numbers may be underestimated if the extinction is much higher, as is expected for the ClassI sources (see Sect. 6.4).
Byte-by-byte Description of file: table6.dat
Bytes Format Units Label Explanations
1- 9 A9 --- --- [NGC 7129-] 10- 17 A8 --- ID Source name (SN-UNNNN) (G1) 19- 26 A8 --- OName Other Name 29- 32 F4.2 arcsec O-S ?=- Difference in position between ID and OName sources 34- 38 F5.2 mag Vmag ?=- V magnitude 40- 44 F5.2 mag Rmag ?=- R magnitude 46- 50 F5.2 mag Imag ?=- I magnitude 52- 56 F5.2 mag Jmag ?=- 2MASS J magnitude 58- 61 F4.2 mag e_Jmag ? rms uncertainty on Jmag 63- 67 F5.2 mag Hmag ?=- 2MASS H magnitude 69- 72 F4.2 mag e_Hmag ? rms uncertainty on Hmag 74- 78 F5.2 mag Kmag ?=- 2MASS Ks magnitude 80- 83 F4.2 mag e_Kmag ? rms uncertainty on Kmag 85- 89 F5.2 mag [3.6] ?=- Spitzer/IRAC 3.6um magnitude 91- 94 F4.2 mag e_[3.6] ? rms uncertainty on [3.6] 96-100 F5.2 mag [4.5] ?=- Spitzer/IRAC 4.5um magnitude 102-105 F4.2 mag e_[4.5] ? rms uncertainty on [4.5] 107-111 F5.2 mag [5.8] ?=- Spitzer/IRAC 5.8um magnitude 113-116 F4.2 mag e_[5.8] ? rms uncertainty on [5.8] 118-122 F5.2 mag [8.0] ?=- Spitzer/IRAC 8.0um magnitude 124-127 F4.2 mag e_[8.0] ? rms uncertainty on [8.0] 129-132 F4.2 mag [24] ?=- Spitzer/MIPS 24um magnitude 134-137 F4.2 mag e_[24] ? rms uncertainty on [24] 139-140 A2 --- YSO YSO class 141 A1 --- f_YSO [*] * identify objects selected on basis of near-IR data 142 A1 --- AGN? [A] possible background AGN
Global Notes: Note (G1): Nomenclature used in Simbad: <[SS2009] NGC 7129-SN-XNN> (tables 2, 3, 4) <[SS2009] NGC 7129-SN-UNNN> (tables 5 and 6)
History: From electronic version
(End) Patricia Vannier [CDS] 14-Sep-2010
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

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