2004ApJ...614..267F


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.13CEST04:57:50

2004ApJ...614..267F - Astrophys. J., 614, 267-283 (2004/October-2)

An X-ray census of young stars in the Chamaeleon I North cloud.

FEIGELSON E.D. and LAWSON W.A.

Abstract (from CDS):

Sensitive X-ray imaging surveys provide a new and effective tool to establish the census of pre-main-sequence (PMS) stars in nearby young stellar clusters. We report here a deep Chandra X-Ray Observatory observation of PMS stars in the Chamaeleon I North cloud, achieving a limiting luminosity of logLt≃27 ergs/s (0.5-8 keV band) in a 0.8x0.8 pc2 region. Of the 107 X-ray sources, 37 are associated with Galactic stars of which 27 are previously recognized cloud members. These include three PMS brown dwarfs; the protostellar brown dwarf ISO 192 has a particularly high level of magnetic activity. Follow-up optical photometry and spectroscopy establish that 9-10 of the Chandra sources are probably magnetically active background stars. Several previously proposed cloud members are also inferred to be interlopers because of the absence of X-ray emission at the level expected from the logLt-K correlation. No new X-ray-discovered stars were confidently found despite the high sensitivity. From these findings, we argue that the sample of 27 PMS cloud members in the Chandra field is uncontaminated and complete down to K=12 or M≃0.1 M. The initial mass function (IMF) derived from our sample is deficient in 0.1-0.3 Mstars compared with the IMF of the rich Orion Nebula cluster and other Galactic populations. We cannot discriminate whether this is due to different star formation processes, mass segregation, or dynamical ejection of lower mass stars.

Abstract Copyright:

Journal keyword(s): Galaxy: Open Clusters and Associations: Individual: Name: Chamaeleon I - Stars: Low-Mass, Brown Dwarfs - Stars: Luminosity Function, Mass Function - Stars: Pre-Main-Sequence - X-Rays: Stars

VizieR on-line data: <Available at CDS (J/ApJ/614/267): table1.dat table2.dat table3.dat>

Nomenclature: Table 1: [FL2004] NNN (Nos 1-107).

Simbad objects: 118

goto Full paper

goto View the reference in ADS

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 - 2020
#notes
1 NGC 1333 OpC 03 29 11 +31 18.6           ~ 1219 1
2 IC 348 OpC 03 44 34 +32 09.8           ~ 1227 1
3 NAME Orion Nebula Cluster OpC 05 35.0 -05 29           ~ 1977 1
4 M 42 HII 05 35 17.3 -05 23 28           ~ 3724 0
5 NAME Ori A MoC 05 38 -07.1           ~ 2675 0
6 NGC 2024 Cl* 05 41 43 -01 50.5           ~ 1071 1
7 NAME Mon R2 HII 06 07 46.6 -06 22 59           ~ 650 2
8 V* TZ Cha Or* 11 03 50.9841826761 -76 55 45.608767007           A 11 0
9 NAME Cha I MoC 11 06 48 -77 18.0           ~ 968 1
10 [FL2004] 1 X 11 07 13.6 -76 38 55           ~ 1 0
11 [FL2004] 2 X 11 07 34.4 -76 34 34           ~ 1 0
12 [FL2004] 3 X 11 07 45.1 -76 35 32           ~ 1 0
13 [FL2004] 4 X 11 08 10.2 -76 29 02           ~ 1 0
14 [FL2004] 5 X 11 08 18.9 -76 32 55           ~ 1 0
15 [FL2004] 6 X 11 08 21.2 -76 33 52           ~ 1 0
16 [FL2004] 7 X 11 08 23.9 -76 33 08           ~ 1 0
17 [FL2004] 9 X 11 08 41.5 -76 34 51           ~ 1 0
18 [FL2004] 10 X 11 08 42.8 -76 36 37           ~ 1 0
19 [FL2004] 11 X 11 08 44.3 -76 34 38           ~ 1 0
20 [FL2004] 12 X 11 08 46.0 -76 26 24           ~ 1 0
21 [FL2004] 13 X 11 08 48.3 -76 40 55           ~ 1 0
22 [FL2004] 14 X 11 08 50.9 -76 38 00           ~ 1 0
23 Sz 28 pr* 11 08 50.9082136997 -76 25 13.683233652   16.4     14.60 M4Ve 32 0
24 2MASS J11085135-7638262 pr* 11 08 51.3534422590 -76 38 26.226894812           K5-6 2 0
25 CHX 13 X 11 08 55.7 -76 35 59           M0 19 0
26 [FL2004] 17 X 11 08 56.6 -76 33 41           ~ 1 0
27 [FL2004] 18 X 11 09 01.2 -76 33 57           ~ 1 0
28 [FL2004] 19 X 11 09 01.3 -76 34 17           ~ 1 0
29 [FL2004] 20 X 11 09 05.3 -76 23 51           ~ 1 0
30 [FL2004] 21 X 11 09 07.4 -76 32 16           ~ 1 0
31 2MASS J11091011-7627113 pr* 11 09 10.1318075371 -76 27 11.314432187           K 2 0
32 [FL2004] 23 X 11 09 11.8 -76 31 37           ~ 1 0
33 2MASS J11091336-7630232 pr* 11 09 13.3725526890 -76 30 23.300554657           M0- 2 0
34 HJM C 1-15 pr* 11 09 13.8184943576 -76 28 39.688945442         13.91 M4Ve 25 0
35 [CCE98] 1-74 TT* 11 09 17.6894816682 -76 27 57.916038219   15.48 13.92   11.72 K4Ve 40 0
36 V* HU Cha Or* 11 09 18.12888 -76 30 29.2500         14.99 M1/2e 47 0
37 [FL2004] 28 X 11 09 22.3 -76 39 03           ~ 1 0
38 V* HV Cha Or* 11 09 22.6506851116 -76 34 32.169764007         16.79 M0.75-M1.75 49 0
39 [FL2004] 30 X 11 09 22.7 -76 28 49           ~ 1 0
40 [FL2004] 31 X 11 09 27.2 -76 41 39           ~ 1 0
41 [FL2004] 32 X 11 09 27.3 -76 34 30           ~ 1 0
42 V* GM Cha Or* 11 09 28.55424 -76 33 28.1376           M3.5-M6.5 41 0
43 [FL2004] 34 X 11 09 31.1 -76 29 02           ~ 1 0
44 [FL2004] 35 X 11 09 31.5 -76 28 22           ~ 1 0
45 [FL2004] 36 X 11 09 33.3 -76 32 52           ~ 1 0
46 [FL2004] 37 X 11 09 38.4 -76 38 47           ~ 1 0
47 CHX 15b pr* 11 09 40.0554020707 -76 28 39.259268411   15.68 14.04   11.66 K8Ve 33 0
48 [FL2004] 39 X 11 09 40.9 -76 29 46           ~ 1 0
49 [FL2004] 40 X 11 09 41.6 -76 30 42           ~ 1 0
50 V* HW Cha Or* 11 09 41.9197773612 -76 34 58.597303951           M0- 32 0
51 CXOU J110945.1-763022 X 11 09 45.1 -76 30 22           ~ 1 0
52 HJM C 1-24 TT* 11 09 46.1867409078 -76 34 46.505353388   11.93 18.41   14.72 M3.25e 52 1
53 HD 97300 Ae* 11 09 50.0178181814 -76 36 47.711452436   9.41 9.20   8.82 B9V 157 1
54 CHXX 11 X 11 09 51.3 -76 27 16           ~ 2 0
55 ISO-ChaI 217 pr* 11 09 52.1370847465 -76 39 12.880114192         16.63 ~ 42 0
56 Ass Cha T 1-23 Or* 11 09 53.4191770981 -76 34 25.652662545   13.9 19.50 15.10 13.52 G9IIIe 80 0
57 V* HX Cha Or* 11 09 54.062760 -76 29 25.54332       16.08 14.03 M3.5+M7 62 0
58 V* HY Cha Or* 11 09 54.3715732403 -76 31 11.425347874     21.6   17.27 M1.75e 26 0
59 2MASS J11095465-7625333 * 11 09 54.6430276215 -76 25 33.502577657   17.39 16.12 15.94   III 3 0
60 HJM C 1-2 Or* 11 09 55.0057844533 -76 32 41.235293097         17.85 M0- 31 0
61 [FL2004] 52 X 11 09 56.6 -76 27 36           ~ 1 0
62 V* WW Cha Or* 11 10 00.0791962314 -76 34 57.971855660   14.74 14.10   10.95 ~ 131 0
63 [FL2004] 54 X 11 10 00.7 -76 43 29           ~ 1 0
64 HJM C 1-4 Y*O 11 10 03.6833471517 -76 33 29.222406347     18.78 16.1 14.72 K8e 52 0
65 V* FN Cha Or* 11 10 04.6715878167 -76 35 45.254940394     14.68 13.89 12.39 K5Ve 47 0
66 [FL2004] 57 X 11 10 06.3 -76 29 48           ~ 1 0
67 V* WY Cha Or* 11 10 07.0323174364 -76 29 37.640377806   15.29 13.87   11.62 K8Ve 79 1
68 [FL2004] 59 X 11 10 07.9 -76 34 23           ~ 1 0
69 [FL2004] 60 X 11 10 09.4 -76 41 49           ~ 1 0
70 HJM C 1-8 Y*O 11 10 11.3920788538 -76 35 29.251306607         13.75 K5Ve 50 0
71 CHXR 45 X 11 10 11.4 -76 35 48           ~ 3 0
72 [FL2004] 62 X 11 10 12.1 -76 37 27           ~ 1 0
73 [FL2004] 63 X 11 10 13.8 -76 37 39           ~ 1 0
74 CHXX 17 X 11 10 22.7 -76 27 16           ~ 2 0
75 CHXX 19 X 11 10 27.4 -76 27 17           ~ 2 0
76 [FL2004] 66 X 11 10 32.1 -76 41 09           ~ 1 0
77 [FL2004] 67 X 11 10 36.2 -76 34 10           ~ 1 0
78 [FL2004] 68 X 11 10 36.9 -76 31 33           ~ 1 0
79 [FL2004] 69 X 11 10 41.3 -76 34 10           ~ 1 0
80 [FL2004] 70 X 11 10 46.8 -76 45 15           ~ 1 0
81 [FL2004] 71 X 11 10 47.2 -76 30 44           ~ 1 0
82 [FL2004] 72 X 11 10 52.5 -76 29 16           ~ 1 0
83 CHXR 80 AG? 11 10 52.7 -76 28 10           ~ 5 0
84 V* WZ Cha Or* 11 10 53.3208321416 -76 34 32.060346788   16.41 15.48   13.07 M4Ve 61 0
85 HJM C 2-5 pr* 11 10 56.0147051732 -76 45 32.757909031         13.95 M6e 42 0
86 [FL2004] 76 X 11 10 58.3 -76 40 04           ~ 1 0
87 [FL2004] 77 X 11 11 01.8 -76 32 36           ~ 1 0
88 [FL2004] 78 X 11 11 04.0 -76 39 03           ~ 1 0
89 2MASS J11110504-7629415 ** 11 11 05.04336 -76 29 41.5428           ~ 1 0
90 [FL2004] 80 X 11 11 06.4 -76 32 40           ~ 1 0
91 [FL2004] 81 X 11 11 09.8 -76 37 13           ~ 1 0
92 [FL2004] 82 X 11 11 10.1 -76 36 27           ~ 1 0
93 [FL2004] 83 X 11 11 10.6 -76 32 33           ~ 1 0
94 2MASS J11111680-7628573 pr* 11 11 16.7917578596 -76 28 57.484683349   16.98 16.03     K0- 3 0
95 [FL2004] 85 X 11 11 19.7 -76 34 49           ~ 1 0
96 2MASS J11111985-7638264 pr* 11 11 19.9103992280 -76 38 26.044165188           M3-4 2 0
97 [FL2004] 87 X 11 11 21.6 -76 35 12           ~ 1 0
98 2MASS J11112310-7633541 pr* 11 11 23.1069997192 -76 33 54.150732271           ~ 1 0
99 CHXR 83 X 11 11 24.2 -76 37 43           ~ 2 0
100 [FL2004] 90 X 11 11 25.9 -76 36 06           ~ 1 0
101 HJM E 1-7 Or* 11 11 34.7529878525 -76 36 21.250012774   16.35 14.73   12.35 K8Ve 29 0
102 [FL2004] 92 X 11 11 38.5 -76 30 40           ~ 1 0
103 [FL2004] 93 X 11 11 40.8 -76 39 00           ~ 1 0
104 [FL2004] 94 X 11 11 41.3 -76 36 39           ~ 1 0
105 [FL2004] 95 X 11 11 44.9 -76 40 17           ~ 1 0
106 [FL2004] 96 X 11 11 47.2 -76 29 33           ~ 1 0
107 CHXX 38 X 11 11 49.1 -76 30 31           ~ 2 0
108 2MASS J11120016-7631281 pr* 11 12 00.1534853204 -76 31 27.943547238           ~ 1 0
109 2MASS J11120019-7634304 pr* 11 12 00.1853450031 -76 34 30.302943486           ~ 1 0
110 HJM E 1-10 pr* 11 12 03.2797581554 -76 37 03.244993895         13.97 M5.5e 27 0
111 [FL2004] 101 X 11 12 04.5 -76 33 43           ~ 1 0
112 CHXX 42 X 11 12 05.6 -76 31 38           ~ 2 0
113 Sz 40 Or* 11 12 09.8315145785 -76 34 36.496433593   15.2     13.41 M4.5Ve 52 0
114 CHXX 47 X 11 12 20.1 -76 31 44           ~ 2 0
115 Sz 41 TT* 11 12 24.3971939698 -76 37 06.179976409   11.2 11.60   10.22 K7+M2.5 91 1
116 [FL2004] 106 X 11 12 26.3 -76 35 30           ~ 1 0
117 [FL2004] 107 X 11 12 46.9 -76 32 04           ~ 1 0
118 NAME rho Oph A Cloud MoC 16 26 26.4 -24 22 33           ~ 238 1

    Equat.    Gal    SGal    Ecl

To bookmark this query, right click on this link: simbad:objects in 2004ApJ...614..267F and select 'bookmark this link' or equivalent in the popup menu


2020.07.13-04:57:51

© Université de Strasbourg/CNRS

    • Contact