1999AJ....117.2381P

Query : 1999AJ....117.2381P

1999AJ....117.2381P - Astron. J., 117, 2381-2397 (1999/May-0)

The history of low-mass star formation in the upper Scorpius OB association.

PREIBISCH T. and ZINNECKER H.

Abstract (from CDS):

We use a large sample of about 100 low-mass pre-main-sequence (PMS) stars in the Upper Scorpius OB association to explore the star formation history and the initial mass function of this association. Upper Scorpius is an ideal target for such a study, because the star formation process there is finished. The PMS stars have recently been found in a spatially unbiased wide-field survey of X-ray-selected stars in a 160 deg2 area, covering the Upper Scorpius association nearly completely. Following the optical characterization of these PMS stars, we present a new HR diagram for this association. We perform a detailed analysis of the HR diagram, taking proper account of the uncertainties and the effects of unresolved binaries, and derive ages and masses for the PMS stars. We find that the low-mass PMS stars have a mean age of about 5 Myr and show no evidence for a large age dispersion. This agrees very well with the age of 5-6 Myr previously found for the massive stars and shows that low-mass and high-mass stars are coeval and cospatial and thus have formed together. We conclude that the star formation process in Upper Scorpius was probably triggered by the shock wave of a supernova explosion in the nearby Upper Centaurus-Lupus association. After a short burst of very high star formation activity, which lasted only for a few Myr, star formation in Upper Scorpius was halted, probably by the strong winds and the ionizing radiation of the numerous massive stars that dispersed the molecular cloud.

Abstract Copyright: ∼

Journal keyword(s): Galaxy: Open Clusters and Associations: Individual: Name: Scorpius-Centaurus - Stars: Coronae - Stars: Formation - Stars: Luminosity Function, Mass Function - Stars: Pre-Main-Sequence - X-Rays

Nomenclature: Table 1: [PZ99] JHHMMSS.s-DDMMSS N=86.

CDS comments: Cross-id: W94 = ScoPMS.

Simbad objects: 108

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Number of rows : 108
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 NGC 1333 OpC 03 29 09.2 +31 20 59           ~ 1575 1
2 NAME Perseus Cloud SFR 03 35.0 +31 13           ~ 1553 0
3 IC 348 OpC 03 44 31.1 +32 10 02           ~ 1476 1
4 Cl Melotte 22 OpC 03 46 38.0 +24 10 41           ~ 3679 0
5 NAME Tau-Aur Complex SFR 04 30 +25.0           ~ 1453 0
6 NAME Orion Nebula Cluster OpC 05 35.0 -05 29           ~ 2514 0
7 M 42 HII 05 35 16.8 -05 23 15           ~ 4411 0
8 NAME Ori A MoC 05 38 -07.1           ~ 3187 0
9 NAME Cha 1 MoC 11 06 48 -77 18.0           ~ 1266 1
10 NAME Lower Centaurus Crux As* 12 19 -57.1           ~ 565 1
11 NAME Upper Centaurus Lupus MGr 15 24 -41.9           ~ 567 1
12 2MASS J15355780-2324046 TT* 15 35 57.8066655408 -23 24 04.590783648   13.1       K3 29 0
13 CD-26 10981 Or* 15 41 06.7900964808 -26 56 26.297161368   12.15 11.255 10.80 10.13 K1V 42 0
14 GSC 06781-00908 Or* 15 44 13.3464077640 -25 22 59.115801540   14.4       M1 25 0
15 HBC 602 TT* 15 48 08.53752 -25 07 01.1460   17.681 16.536     M3e 9 0
16 CD-25 11113 TT* 15 49 20.9990795520 -26 00 06.318844236   11.78 11.116   9.727 K1IVe 33 0
17 RX J1551.1-2402 Or* 15 51 06.6015760608 -24 02 19.119444468   15.08 14.465 13.5 12.057 ~ 30 0
18 2MASS J15523122-2633529 Or* 15 52 31.2274758072 -26 33 52.943626440   13.1       M0 14 0
19 HD 142361 TT* 15 54 59.8695458688 -23 47 18.180029616   9.68 8.960   8.092 G3V 74 0
20 2MASS J15550624-2521102 Or* 15 55 06.2325059976 -25 21 10.578301020   13.5       M1 16 0
21 ScoPMS 8b TT* 15 55 17.0367971424 -23 22 16.607750088       14.55   M2.5Ve 24 0
22 HD 142506 TT* 15 55 48.8220082584 -25 12 24.119074116   11.134 10.274 10.252 9.52 G8V 41 0
23 1RXS J155702.5-195037 TT* 15 57 02.3596639104 -19 50 42.030388068   12.64 11.665   10.170 K7 30 0
24 RX J1557.3-2529 TT* 15 57 16.743336 -25 29 19.31604   14.127 12.680 12.297 10.84 M0 26 0
25 RX J155720.1-233847 Or* 15 57 19.9921604088 -23 38 49.968268224           M0V 29 0
26 V* V1147 Sco TT* 15 57 25.744032 -23 54 22.30020   15.64 13.90 13.47   M0.5V 27 0
27 V* V1148 Sco BY* 15 57 34.3068411912 -23 21 12.268691748         11.27 M1IVe 47 0
28 RX J1557.8-2305 Or* 15 57 50.0330824392 -23 05 09.511498176       12.7   ~ 34 0
29 CD-23 12602 TT* 15 58 12.7076690664 -23 28 36.528700008   11.16 10.36 9.9   G9V 54 0
30 TYC 6191-552-1 TT* 15 58 47.7201616872 -17 57 59.699522340   13.34 12.09 11.68 10.41 K5 58 0
31 ASAS J155902-1844.3 TT* 15 59 02.0708997384 -18 44 14.341708140   13.293 12.022 11.745   K7 32 0
32 2MASS J15594989-2555584 Or* 15 59 49.8890750184 -25 55 58.549443744   14.3     12.01 M2 22 0
33 V* V1150 Sco Or* 15 59 59.9527097064 -22 20 36.759121188     11.99   10.90 M1V 40 0
34 CD-24 12445 Or* 16 00 00.7745908992 -25 09 42.394617612   11.07 10.50     G0 31 0
35 2MASS J16001330-2418106 Or* 16 00 13.3003897920 -24 18 10.678264560   14.6   13.1   M0.5e 31 0
36 RX J1600.5-2027 TT* 16 00 31.3480737649 -20 27 04.999094488   14.8     11.16 M1 27 0
37 TYC 6212-1183-1 Or* 16 00 40.5646027152 -22 00 32.231715588   12.259 11.213 11.016 9.931 G9 49 0
38 RX J1600.7-2127 TT* 16 00 42.7696857312 -21 27 38.014214220   14.2 12.941 11.7 11.109 K7 28 0
39 V* V1151 Sco Or* 16 01 05.1852470424 -22 27 31.320270432   15.23 13.69 13.38 11.14 M3Ve 37 0
40 RX J1601.1-2113 Or* 16 01 08.0169370824 -21 13 18.555249216   13.9 12.511 12.0 10.785 M0 35 0
41 CD-22 11298 Or* 16 01 25.6301810064 -22 40 40.289030832   13.02 13.44     K1IV 75 0
42 RX J1601.7-2049 Or* 16 01 47.4388749576 -20 49 45.748969788   14.3     10.87 M0 34 0
43 2MASS J16015149-2445249 TT* 16 01 51.4903649252 -24 45 25.061980436   13.4       K7 25 0
44 BD-19 4288 TT* 16 01 58.2155255520 -20 08 11.954643036   11.58 10.501 9.9 9.275 G9IV(e) 47 0
45 RX J1602.0-2221 TT* 16 02 00.3949060416 -22 21 23.842479852   14.9 13.591 12.8 11.265 M1.0e 47 0
46 V* V1153 Sco Or* 16 02 08.4542714448 -22 54 59.082274404           M1V 34 0
47 V* V1154 Sco Or* 16 02 10.4340916128 -22 41 28.824128520   12.46 11.32 10.96   K5+K5 56 0
48 GSC 06783-02489 Or* 16 02 39.1034853768 -25 42 07.855505136   13.2       K7 25 0
49 RX J1602.8-2401B Or* 16 02 51.1649651376 -24 01 50.297892708         14.65 M7-8 41 0
50 RX J1602.8-2401 Or* 16 02 51.2266141056 -24 01 57.465435864   13.81 12.58 12.01 10.79 K4 42 0
51 RX J1602.9-2022 TT* 16 02 53.962800 -20 22 48.00216   13.861 12.442 12.207 10.503 K5V 29 0
52 1RXS J160301.7-180614 Or* 16 03 02.6799812736 -18 06 05.022461988   13.295 12.059 11.831 10.589 M0 25 0
53 RX J1603.3-1751 Or* 16 03 23.6585098008 -17 51 42.471253116   14.940 13.340 13.097   M2e 19 0
54 RX J1603.9-2031B TT* 16 03 54.9656958000 -20 31 38.559952200   14.0 13.205 12.20 10.932 M0 31 0
55 RX J1603.9-2031 TT* 16 03 57.6711677256 -20 31 05.604697272   13.4   11.73 10.92 K5 75 0
56 RX J160421-21307 TT* 16 04 20.9770582632 -21 30 41.699268144   16.6     11.99 M2 34 0
57 ATO J241.0901-21.5080 Or* 16 04 21.6547947840 -21 30 28.550063304   13.3       K2 190 0
58 ScoPMS 27 Or* 16 04 47.7531686256 -19 30 22.916271132   12.43 11.254   9.822 K3IVe 59 0
59 ScoPMS 28 TT* 16 05 27.2683550136 -19 38 46.707624132     14.05     M1V 27 0
60 CRTS J160539.3-215233 Or* 16 05 39.3660891144 -21 52 33.834450432   15.8 13.13 13.6   M3.5 21 0
61 ScoPMS 29 TT* 16 05 42.6751395912 -20 04 15.244538304           M2V 25 0
62 CD-25 11330 TT* 16 05 50.6524391928 -25 33 13.618314720   11.87 10.895   9.797 K1V(e) 38 0
63 RX J1606.2-2036 TT* 16 06 12.5411330016 -20 36 47.292443280   14.0 12.737 12.5 10.838 K5 31 0
64 ScoPMS 31 TT* 16 06 21.9398106936 -19 28 44.802473268     13.47     M0.5V 56 0
65 RX J1606.6-2108 Y*O 16 06 37.408608 -21 08 40.49016   15.822 14.177 13.395   ~ 10 0
66 ScoPMS 32 TT* 16 06 39.9043527312 -20 01 28.188399432           M3V 27 0
67 RX J1606.8-2416 TT* 16 06 54.388800 -24 16 10.84908   14.05 12.72 12.61   M3e 26 0
68 RX J1607.0-2036 Or* 16 07 03.5541108312 -20 36 26.875993608   13.54 12.232 11.75 10.334 M0 24 1
69 2MASS J16070373-2043074 TT* 16 07 03.7301834304 -20 43 07.427479872   16.0 14.51 13.6   M1 22 0
70 RX J1607.0-1911 TT* 16 07 03.9381893688 -19 11 33.973928988     14.207   11.782 M1 32 0
71 ASAS J160814-1908.7 Or* 16 08 14.7441391872 -19 08 32.688788424   13.01 11.403   9.962 K2 48 0
72 GSC 06205-00954 Or* 16 08 31.3764180336 -18 02 41.465215824   14.0       M0 28 0
73 CD-25 11378 TT* 16 08 43.4068352136 -26 02 16.794704112   11.16 10.380   9.265 G9V(e) 42 0
74 GSC 06209-01501 Or* 16 08 56.7301379616 -20 33 45.837138816   13.3       K5 35 0
75 RX J1609.5-2105 Or* 16 09 30.3075290712 -21 04 58.943800992   14.21 12.77 12.25 10.99 M0.0e 103 0
76 1RXS J160941.7-221803 TT* 16 09 40.9929383688 -22 17 59.527565484   13.8 12.561   10.655 M0e 45 0
77 RX J1610.3-2502 TT* 16 10 19.1894233032 -25 02 30.224806764   13.50 11.978 11.55 10.26 K5V(e) 41 0
78 RX J1610.3-1904 TT* 16 10 21.7424768952 -19 04 06.590282484           M1V 39 0
79 GSC 06209-00982 TT* 16 10 28.570872 -19 04 46.89804   15.623 13.957 13.584   M3V 39 0
80 RX J1610.6-2101 Or* 16 10 42.0231353688 -21 01 32.069774784   13.667   12.120 10.627 K5 25 0
81 Wa Oph 1 Or* 16 11 08.9057560608 -19 04 46.976720052     12.073   10.194 K2IV(e) 75 0
82 ScoPMS 45 Or* 16 11 20.5774543272 -18 20 55.035502656     12.49     K5IV 44 0
83 V* V866 Sco TT* 16 11 31.345632 -18 38 25.96200   13.98 12.63 12.81   K0e+K5e 303 0
84 RX J1611.9-2304 Y*O 16 11 56.325600 -23 04 04.63332   14.581 13.038 12.741   M1 17 0
85 Wa Oph 2 Or* 16 11 59.2702332696 -19 06 53.316517068     11.66 11.57   K2Ve 74 0
86 NAME Upper Sco Association As* 16 12 -23.4           ~ 1586 1
87 ScoPMS 51 Or* 16 12 20.9256673824 -19 09 04.111085808     15.10     M2.5V 33 0
88 BD-18 4244 Or* 16 12 40.5144406080 -18 59 28.267620432   12.15 10.829   9.235 K0IV(e) 97 0
89 1RXS J161303.8-225745 TT* 16 13 02.7175229544 -22 57 44.493041124   12.6 11.813   10.265 K5 41 0
90 BD-21 4301 Or* 16 13 18.5815434312 -22 12 49.018896144   11.43 10.432   9.105 K1IV(e) 52 0
91 1RXS J161329.9-231122 TT* 16 13 29.2885211952 -23 11 07.577357064   12.5 11.660   10.231 K1 48 0
92 2MASS J16140211-2301021 TT* 16 14 02.1139873416 -23 01 02.188083216   12.2       G4 44 0
93 CD-22 11432 TT* 16 14 11.0697507472 -23 05 36.071480044   11.90 10.70   9.255 K2IV 86 0
94 2MASS J16141394-1938282 * 16 14 13.9469395224 -19 38 28.147908048           K2 5 0
95 CD-27 10866 TT* 16 14 59.1828176592 -27 50 22.940776140   12.09 11.205   10.052 K0IV(e) 56 0
96 NAME Upper Sco-Cen As* 16 15 -24.2           ~ 1497 1
97 V* VV Sco Or* 16 15 34.56528 -22 42 42.1092     12.684   10.660 K5Ve+M0Ve 67 0
98 CD-23 12815 TT* 16 16 17.9464840536 -23 39 47.541690900   11.42 10.685   9.525 G9IV 50 0
99 HD 146516 TT* 16 17 31.3909720200 -23 03 36.123102792     10.143   9.130 G7V 57 0
100 CD-22 11502 TT* 16 19 33.9664198296 -22 28 29.466255036   12.72 11.312   10.065 K1IV 45 0
101 RX J1620.7-2348 TT* 16 20 45.9589363608 -23 48 20.906432316           ~ 31 0
102 Haro 1-1 Or* 16 21 34.7045923320 -26 12 26.913018060   14.59       K5e 73 0
103 CD-22 11523 Or* 16 23 07.8224200992 -23 00 59.996370852   13.10 11.85 11.71 10.290 K5 48 0
104 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 3969 1
105 BD-21 4369 Or* 16 29 48.6927879432 -21 52 11.928822636   12.54 11.315   9.740 K2IVe 53 0
106 * zet Oph Be* 16 37 09.5400587698 -10 34 01.509742704 1.73 2.58 2.56 2.46 2.50 O9.2IVnn 1908 0
107 NAME Sco OB 1 As* 16 53.5 -41 57           ~ 222 0
108 NAME Cen-Lup As* ~ ~           ~ 11 0

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