2009A&A...507..227S


C.D.S. - SIMBAD4 rel 1.7 - 2020.12.02CET11:54:53

2009A&A...507..227S - Astronomy and Astrophysics, volume 507, 227-240 (2009/11-3)

A Chandra and Spitzer census of the young star cluster in the reflection nebula NGC 7129.

STELZER B. and SCHOLZ A.

Abstract (from CDS):

The reflection nebula NGC7129 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 NGC7129. 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, NGC7129 is in the critical range where disks around young stars disappear. We make use of X-ray and IR imaging observations to identify the pre-main sequence stars in NGC7129. We define a sample of young stellar objects based on color-color diagrams composed from IR photometry between 1.6 and 8µm, from 2MASS and Spitzer, and based on X-ray detected sources from a Chandra observation. This sample is composed of 26 ClassII and 25ClassIII candidates. It has been selected from infrared sources in the Chandra field (287 objects with photometry in all four Spitzer/IRAC bands, 811 objects with near-IR photometry) and the 59 X-ray sources detected with Chandra. The sample is estimated to be complete down to ∼ 0.5M. The most restricted and least biased subsample of pre-main sequence stars is composed of lightly absorbed (AV<5mag) stars in the cluster core. This sample comprises 7 ClassII and 14 ClassIII sources and has a disk fraction of 33+24–19% and a median X-ray luminosity of logLx[erg/s]=30.3. Despite the various uncertainties related to the sample selection, absorption, mass distribution, distance, and, consequently in the computation of disk fraction and X-ray luminosities, the data yield consistent results. In particular, we confirm the age of ∼3Myr for the NGC7129 cluster. The derived disk fraction is similar to that of σOrionis, smaller than for ChaI (∼2Myr), and larger than for Upper Sco (5Myr). The X-ray luminosity function is similar to that of NGC2264 (2Myr) but fainter than for the Orion Nebula Cluster (1Myr). The pre-main sequence census should be further refined and extended with optical photometric and spectroscopic searches for cluster members.

Abstract Copyright:

Journal keyword(s): X-rays: stars - infrared: stars - stars: pre-main sequence - stars: formation

VizieR on-line data: <Available at CDS (J/A+A/507/227): table2.dat table3.dat table4.dat table5.dat table6.dat>

Nomenclature: Tables 2-4: [SS2009] NGC 7129-SN-XNN N=59. Tables 5-6: [SS2009] NGC 7129-SN-UNNNN N=46.

Simbad objects: 118

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Number of rows : 118

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 IC 348 OpC 03 44 34 +32 09.8           ~ 1238 1
2 CoKu Tau-Aur Star 4 TT* 04 41 16.8106225314 +28 40 00.077173462   16.40 14.68 14.59   M1.5e 167 0
3 NAME Orion Nebula Cluster OpC 05 35.0 -05 29           ~ 2021 1
4 NAME sigma Orionis Cluster MGr 05 38 42 -02 36.0           ~ 492 0
5 NGC 2264 OpC 06 40 58 +09 53.7     3.9     ~ 1606 1
6 V* TW Hya TT* 11 01 51.9054298616 -34 42 17.031550898   11.94 10.50 10.626 9.18 K6Ve 1571 1
7 NAME Cha I MoC 11 06 48 -77 18.0           ~ 994 1
8 NAME Chandra Deep Field-North reg 12 36.8 +62 13           ~ 617 0
9 NAME Upper Sco Association As* 16 12 -23.4           ~ 1066 1
10 [SS2009] NGC 7129-S3-U1178 Y*? 21 41 55.30 +66 07 41.5           ~ 2 0
11 2MASS J21421765+6608404 Y*O 21 42 17.6640696984 +66 08 40.289967812           ~ 4 0
12 [SS2009] NGC 7129-S3-X58 X 21 42 19.32 +66 07 26.6           ~ 1 0
13 [MMN2004b] 1 Em* 21 42 23.0715507152 +66 06 04.324855919     20.11 19.02 17.52 M3V 5 0
14 [SS2009] NGC 7129-S3-X53 Y*O 21 42 24.73 +66 01 41.0           ~ 1 0
15 2MASS J21423472+6605186 Y*O 21 42 34.7145628725 +66 05 18.740379908     17.80 16.63   M3V 2 0
16 [MMN2004b] 2 Em* 21 42 38.8087273000 +66 06 35.929967340     18.67 17.66 16.45 ~ 8 0
17 [SS2009] NGC 7129-S3-X41 * 21 42 39.096 +66 07 09.65     18.37 16.7 15.17 K5 2 0
18 2MASS J21424031+6610069 Y*O 21 42 40.3096372713 +66 10 07.004028282   13.03 12.44 12.11   A1IV-V 10 0
19 2MASS J21424049+6609516 Y*O 21 42 40.5447475137 +66 09 51.843903642     19.95 19.1   ~ 4 0
20 [MMN2004b] 3 Em* 21 42 41.9213674601 +66 09 24.451167707     21.19 19.37   ~ 4 0
21 2MASS J21424243+6607451 Y*O 21 42 42.4373363069 +66 07 45.076983114       21.04 18.62 ~ 3 0
22 [SS2009] NGC 7129-S3-U1521 Y*? 21 42 42.86 +66 09 24.0           ~ 2 0
23 2MASS J21424532+6607044 Y*O 21 42 45.3174943197 +66 07 04.478515015     20.91 19.28   ~ 3 0
24 BD+65 1636 Y*O 21 42 46.0408479050 +66 05 13.797828035   11.35 10.98 10.811 10.24 B8V 7 0
25 2MASS J21424608+6605562 Y*O 21 42 46.0836144033 +66 05 56.356005913     18.17 16.86   M2V 4 0
26 2MASS J21424687+6606574 Y*O 21 42 46.8526714498 +66 06 57.460389576     19.65 18.2   M0 3 0
27 IfAHA 777 Y*O 21 42 47.0646314486 +66 04 57.899510058     15.54 14.52   ~ 4 0
28 2MASS J21424790+6606530 Y*O 21 42 47.8986130672 +66 06 53.035266120     17.91 16.63   ~ 3 0
29 2MASS J21424822+6608006 Y*O 21 42 48.2190548367 +66 08 00.625451600       20.46 18.16 ~ 3 0
30 2MASS J21424987+6605426 Y*O 21 42 49.8665197695 +66 05 42.504516648     20.02 18.66   ~ 3 0
31 BD+65 1637 Ae* 21 42 50.1799735837 +66 06 35.184005596 10.21 10.56 10.53 10.29   B3IV-Vne 147 1
32 2MASS J21425092+6606036 Y*O 21 42 50.9228830415 +66 06 03.678808355     17.73 16.52   M2V 4 0
33 2MASS J21425141+6605562 Em* 21 42 51.4060790602 +66 05 56.419410178     20.35 18.77 17.28 ~ 5 0
34 2MASS J21425193+6606337 Y*O 21 42 51.9454322093 +66 06 33.786590453     18.06 17.07   ~ 4 0
35 V* V988 Cep Or* 21 42 52.61952 +66 06 57.2868     18.30 17.04 15.78 M1V 4 0
36 [MMN2004b] 7 Em* 21 42 53.1394040173 +66 07 14.751316127     20.58 19.66 18.24 ~ 5 0
37 2MASS J21425321+6607207 Y*O 21 42 53.2167293816 +66 07 20.775749272     19.30 17.88   ~ 5 0
38 [MMN2004b] 8 Em* 21 42 53.4494264404 +66 09 19.672823429     21.06 19.99 19.01 ~ 4 0
39 V* V989 Cep Or* 21 42 53.4801940372 +66 08 05.287891047     17.66 16.22 14.97 M2V 4 0
40 2MASS J21425404+6608147 Y*O 21 42 54.0234478666 +66 08 14.793156998     19.80 18.23 16.82 G8 3 0
41 2MASS J21425460+6605203 Y*O 21 42 54.5982282348 +66 05 20.439421063       21.16 18.50 ~ 2 0
42 2MASS J21425475+6606353 Y*O 21 42 54.7565457575 +66 06 35.462212096     19.00 17.57   M0V 7 0
43 2MASS J21425480+6606127 Em* 21 42 54.809 +66 06 12.79     17.78 17.51 16.19 ~ 3 0
44 2MASS J21425489+6607213 Y*O 21 42 54.8970330574 +66 07 21.302847663     20.00 18.29   M3V 3 0
45 2MASS J21425569+6606448 Y*O 21 42 55.6887149127 +66 06 44.972975818     21.16 19.55   ~ 2 0
46 2MASS J21425582+6605426 Y*O 21 42 55.8066861760 +66 05 42.731361508     20.41 19.67   M3.5V 3 0
47 2MASS J21425590+6607208 Y*O 21 42 55.9133523643 +66 07 20.872344985     20.70 19.01   M1V 4 0
48 NGC 7129 OpC 21 42 56 +66 06.2     11.5     ~ 236 0
49 [MMN2004b] 11 Em* 21 42 56.2459761901 +66 06 02.218256615     15.75 14.8   ~ 4 0
50 2MASS J21425676+6606372 Y*O 21 42 56.7617094928 +66 06 37.287005746     17.93 16.62   ~ 3 0
51 2MASS J21425719+6606346 Y*O 21 42 57.1959429787 +66 06 34.712905650     17.18 16.07   K5 4 0
52 V* V392 Cep Or* 21 42 57.7365513510 +66 04 23.477230872       19.08 18.00 ~ 27 0
53 RNO 138 RNe 21 42 57.810 +66 04 23.07           ~ 27 0
54 IfAHA 794 Em* 21 42 58.2246304624 +66 05 40.290028685     18.64 17.55   M2V 3 0
55 2MASS J21425832+6607262 Y*O 21 42 58.3211767485 +66 07 26.266260118     22.68 20.15   ~ 3 0
56 2MASS J21425836+6605273 Y*O 21 42 58.362 +66 05 27.39     18.88 17.58   M2.5V 3 0
57 BD+65 1638 Y*O 21 42 58.5649914185 +66 06 10.557956365   10.63 10.42 10.09   B3V 30 0
58 2MASS J21425877+6606368 Y*O 21 42 58.7398004981 +66 06 36.956252229     17.84 16.65   ~ 6 0
59 [SS2009] NGC 7129-S3-X12 X 21 42 58.82 +66 06 10.2           ~ 1 0
60 2MASS J21425944+6610360 Y*O 21 42 59.443 +66 10 36.06           ~ 3 0
61 V* V990 Cep Or* 21 42 59.6194168617 +66 04 33.852477567     18.32 16.23 15.11 M1.5V 16 0
62 [SS2009] NGC 7129-S3-X24 X 21 42 59.78 +66 06 55.7           ~ 1 0
63 [SS2009] NGC 7129-S3-U270 Y*O 21 42 59.82 +66 01 54.9           ~ 2 0
64 2MASS J21425998+6606424 Y*O 21 42 59.9824935512 +66 06 42.401757560     19.69 18.22   M3V 3 0
65 2MASS J21430168+6607089 Y*O 21 43 01.6825945670 +66 07 08.959480503     14.57 13.71   B5 10 0
66 [SS2009] NGC 7129-S3-U419 Y*O 21 43 01.78 +66 03 24.4           ~ 2 0
67 V* V991 Cep Or* 21 43 01.8828038946 +66 06 44.767307352     17.24 16.06   K3-5V 5 0
68 [SS2009] NGC 7129-S3-U500 Y*O 21 43 02.01 +66 04 02.7           ~ 3 0
69 2MASS J21430262+6609505 Y*O 21 43 02.6304780531 +66 09 50.727600855       20.68 18.08 ~ 3 0
70 2MASS J21430292+6608143 Y*O 21 43 02.921 +66 08 14.30           ~ 2 0
71 [SS2009] NGC 7129-S3-X50 X 21 43 03.01 +66 06 55.9           ~ 2 0
72 2MASS J21430435+6605563 Y*O 21 43 04.3034578530 +66 05 56.486714563         18.55 ~ 2 0
73 2MASS J21430502+6606533 Y*O 21 43 04.9774405028 +66 06 53.320546183     17.90 16.48   K2V 3 0
74 2MASS J21430518+6609292 Y*O 21 43 05.1462862415 +66 09 29.193639407     22.45 20.52   M7 2 0
75 2MASS J21430518+6607340 Y*O 21 43 05.188 +66 07 34.09           ~ 1 0
76 [SS2009] NGC 7129-S3-U1242 Y*O 21 43 05.92 +66 07 58.5           ~ 3 0
77 [WKM94] IRS 6 IR 21 43 06.5 +66 06 55           ~ 14 0
78 EM* LkHA 234 Ae* 21 43 06.8214472757 +66 06 54.199354231 13.65 13.61 12.73 11.98 11.20 B5Ve 278 0
79 2MASS J21430696+6606417 Y*O 21 43 06.961 +66 06 41.80           ~ 3 0
80 [SS2009] NGC 7129-S3-X38 X 21 43 07.15 +66 06 54.0           ~ 1 0
81 2MASS J21430784+6607185 Y*O 21 43 07.841 +66 07 18.55       21.8 19.38 ~ 4 0
82 [SS2009] NGC 7129-S3-U550 Y*O 21 43 11.17 +66 04 25.6           ~ 3 0
83 V* V993 Cep Or* 21 43 11.5869152619 +66 09 11.461689328   18.06 16.31 15.23 14.14 M1V 7 0
84 2MASS J21431229+6606055 Y*O 21 43 12.299 +66 06 05.54     21.65 20.17   M5V 3 0
85 2MASS J21431235+6609554 Y*O 21 43 12.3532510229 +66 09 55.387910228     19.71 18.19   M4.5 4 0
86 [SS2009] NGC 7129-S3-U1026 Y*O 21 43 12.42 +66 06 55.9           ~ 2 0
87 2MASS J21431415+6607465 Y*O 21 43 14.158 +66 07 46.53           ~ 3 0
88 2MASS J21431440+6608586 Y*O 21 43 14.4099981559 +66 08 58.811422521     22.48 20.86   M4V 3 0
89 2MASS J21431487+6607378 Y*O 21 43 14.880 +66 07 37.88           ~ 3 0
90 2MASS J21431528+6607571 Y*O 21 43 15.2915082974 +66 07 57.037241490     21.31 19.65   M2.5V 4 0
91 V* V994 Cep Or* 21 43 16.8374341801 +66 05 48.756586267     18.42 17.12 16.00 M2V 4 0
92 2MASS J21431806+6605352 Y*O 21 43 18.0792994952 +66 05 35.262145301     19.74 18.27   M3V 3 0
93 2MASS J21431937+6607215 Y*O 21 43 19.3707433295 +66 07 21.599828779     20.70 19.03   M4.5V 4 0
94 [SS2009] NGC 7129-S2-X3 X 21 43 20.291 +66 08 20.45           ~ 1 0
95 2MASS J21432088+6606519 Y*O 21 43 20.884 +66 06 51.96           ~ 2 0
96 2MASS J21432123+6606237 Y*O 21 43 21.239 +66 06 23.75     17.83 16.6   ~ 2 0
97 [GMM2009] NGC 7129 8 Y*O 21 43 24.13 +66 08 31.5           ~ 4 0
98 [SS2009] NGC 7129-S2-X2 X 21 43 24.89 +66 07 34.1     23.25 21.81   ~ 2 0
99 [SS2009] NGC 7129-S3-U1059 Y*O 21 43 24.90 +66 07 04.7       21.3 19.72 ~ 3 0
100 [SS2009] NGC 7129-S2-U1313 Y*O 21 43 26.64 +66 08 20.5           ~ 3 0
101 V* V996 Cep Or* 21 43 26.9462688662 +66 09 36.448188692     16.49 15.62   M0V 5 0
102 2MASS J21432931+6605556 Y*O 21 43 29.3098635474 +66 05 55.673683501       21.16 18.46 ~ 3 0
103 2MASS J21432932+6603319 Y*O 21 43 29.3391150169 +66 03 31.964817991   11.56 11.24 10.86   G6 3 0
104 [SS2009] NGC 7129-S2-U1083 Y*O 21 43 29.92 +66 07 09.2         21.79 ~ 3 0
105 V* V997 Cep Or* 21 43 31.8151810408 +66 08 50.563170143     18.12 17.04 15.82 ~ 9 0
106 [SS2009] NGC 7129-S2-U804 Y*? 21 43 33.12 +66 05 49.0           ~ 2 0
107 [SS2009] NGC 7129-S2-X8 Y*O 21 43 33.96 +66 10 43.4           ~ 1 0
108 [SVS76] NGC 7129 15 Y*O 21 43 36.2522282320 +66 11 32.885871889           ~ 4 0
109 2MASS J21433863+6612298 Y*O 21 43 38.636 +66 12 29.87           ~ 3 0
110 [MMN2004b] 22 Em* 21 43 43.4336290807 +66 07 30.668881206     18.25 16.82 15.56 ~ 5 0
111 2MASS J21434703+6610011 Y*O 21 43 47.0378440682 +66 10 01.169834964     19.37 18.15 17.04 G5-K0 2 0
112 2MASS J21434869+6604461 Y*O 21 43 48.6957650676 +66 04 46.030064990           ~ 3 0
113 2MASS J21434932+6610128 Y*O 21 43 49.3413236762 +66 10 12.921151138       19.03 17.79 ~ 2 0
114 [SS2009] NGC 7129-S2-X7 X 21 43 53.11 +66 08 09.8           ~ 1 0
115 NAME NGC 7129 FIR 2 IR 21 44 01.5 +66 03 40           ~ 85 0
116 2MASS J21440537+6605531 Y*O 21 44 05.3857615085 +66 05 53.085763374     18.70 17.61   K5 4 0
117 [SS2009] NGC 7129-S2-X14 X 21 44 26.43 +66 10 29.1           ~ 1 0
118 [SS2009] NGC 7129-S2-X10 X 21 44 29.55 +66 07 06.8           ~ 1 0

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2020.12.02-11:54:53

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