1999AJ....117.2381P


C.D.S. - SIMBAD4 rel 1.7 - 2020.10.29CET22:23:23

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: 107

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Number of rows : 107

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           ~ 1231 1
2 NAME Perseus Cloud SFR 03 35.0 +31 13           ~ 1086 0
3 IC 348 OpC 03 44 34 +32 09.8           ~ 1237 1
4 Cl Melotte 22 OpC 03 47 00 +24 07.0           ~ 3026 0
5 NAME Tau-Aur Complex SFR 04 30 +25.0           ~ 1227 0
6 NAME Orion Nebula Cluster OpC 05 35.0 -05 29           ~ 2014 1
7 M 42 HII 05 35 17.3 -05 23 28           ~ 3752 0
8 NAME Ori A MoC 05 38 -07.1           ~ 2698 0
9 NAME Cha I MoC 11 06 48 -77 18.0           ~ 987 1
10 NAME Lower Centaurus Crux As* 12 19 -57.1           ~ 361 1
11 NAME Upper Centaurus Lupus As* 15 24 -41.9           ~ 367 1
12 2MASS J15355780-2324046 TT* 15 35 57.8047816327 -23 24 04.602455044   13.1       K3 26 0
13 CD-26 10981 pr* 15 41 06.7902764961 -26 56 26.297838982   12.15 11.255 10.80 10.13 K1V 31 0
14 2MASS J15441334-2522590 pr* 15 44 13.3464547014 -25 22 59.116101273   14.4       M1 16 0
15 HBC 602 Em* 15 48 08.54 -25 07 01.1           M3 7 0
16 CD-25 11113 TT* 15 49 20.9983836723 -26 00 06.319389448   11.78 11.116   9.727 K1IVe 23 0
17 RX J1551.1-2402 Ro* 15 51 06.6016358341 -24 02 19.118956317   15.08 14.465 13.5 12.057 ~ 20 0
18 2MASS J15523122-2633529 pr* 15 52 31.2273149245 -26 33 52.943470608   13.1       M0 8 0
19 HD 142361 TT* 15 54 59.8690406838 -23 47 18.187188652   9.68 8.960   8.092 G3V 68 0
20 2MASS J15550624-2521102 pr* 15 55 06.2333160524 -25 21 10.571180448   13.5       M1 13 0
21 ScoPMS 8b TT* 15 55 17.0380171777 -23 22 16.620980243       14.55   M2.5Ve 16 0
22 HD 142506 TT* 15 55 48.8221614721 -25 12 24.118534707   11.26 10.50   9.52 G8V 26 0
23 2MASS J15570234-1950419 TT* 15 57 02.3377188792 -19 50 42.390881728   12.64 11.665   10.170 K7 21 0
24 RX J1557.3-2529 TT* 15 57 16.743336 -25 29 19.31604   14.13 12.68 12.30 10.84 M0 19 0
25 RX J155720.1-233847 BY* 15 57 19.9931211627 -23 38 49.863842988           M0V 23 0
26 V* V1147 Sco Ro* 15 57 25.744032 -23 54 22.30020   15.64 13.90 13.47   M0.5V 22 0
27 V* V1148 Sco BY* 15 57 34.3064663755 -23 21 12.260992495         11.27 M1IVe 33 0
28 RX J1557.8-2305 pr* 15 57 50.0330405973 -23 05 09.510639494       12.7   ~ 20 0
29 CD-23 12602 TT* 15 58 12.7075845947 -23 28 36.525801352   11.16 10.36 9.9   G9V 33 0
30 2MASS J15584772-1757595 TT* 15 58 47.7203572373 -17 57 59.699009825   13.34 12.09 11.68 10.41 K5 39 0
31 2MASS J15590208-1844142 TT* 15 59 02.0709086026 -18 44 14.331974248   13.47 12.02     K7 18 0
32 2MASS J15594989-2555584 pr* 15 59 49.8900139816 -25 55 58.533107751   14.3     12.01 M2 11 0
33 V* V1150 Sco Ro* 15 59 59.9523124825 -22 20 36.755050804     11.99   10.90 M1V 28 0
34 CD-24 12445 pr* 16 00 00.7747910183 -25 09 42.394853900   11.07 10.50     G0 18 0
35 2MASS J16001330-2418106 pr* 16 00 13.3005390475 -24 18 10.678111876   14.6   13.1   M0.5e 15 0
36 RX J1600.5-2027 TT* 16 00 31.3480737649 -20 27 04.999094488   14.8     11.16 M1 21 0
37 2MASS J16004056-2200322 pr* 16 00 40.5645309601 -22 00 32.231375434   11.96 10.87 10.2 9.931 G9 31 0
38 ASAS J160042-2127.4 Ro* 16 00 42.7686147426 -21 27 38.018400991   14.2 12.941 11.7 11.109 K7 21 0
39 V* V1151 Sco BY* 16 01 05.189448 -22 27 31.18104   15.23 13.69 13.38 11.14 M3Ve 31 0
40 ASAS J160108-2113.3 Ro* 16 01 08.0168129683 -21 13 18.554021369   13.9 12.511 12.0 10.785 M0 22 0
41 CD-22 11298 BY* 16 01 25.6303327926 -22 40 40.288752171   13.02 13.44     K1IV 56 0
42 RX J1601.7-2049 pr* 16 01 47.4383158719 -20 49 45.775604688   14.3     10.87 M0 22 0
43 2MASS J16015149-2445249 TT* 16 01 51.4903649252 -24 45 25.061980436   13.4       K7 18 0
44 BD-19 4288 TT* 16 01 58.2131874170 -20 08 11.980355783   11.58 10.501 9.9 9.275 G9IV(e) 32 0
45 ASAS J160200-2221.5 Ro* 16 02 00.3948075529 -22 21 23.842623453   14.9 13.591 12.8 11.265 M1.0e 27 0
46 V* V1153 Sco BY* 16 02 08.4545447309 -22 54 59.081544924           M1V 20 0
47 V* V1154 Sco RS* 16 02 10.453776 -22 41 28.30308   12.46 11.32 10.96   K5+K5 52 0
48 2MASS J16023910-2542078 pr* 16 02 39.1032617872 -25 42 07.855947741   13.2       K7 15 0
49 RX J1602.8-2401B TT* 16 02 51.2266722278 -24 01 57.464637466   13.81 12.58 12.01 10.79 K4 20 0
50 2MASS J16025396-2022480 TT* 16 02 53.9444880019 -20 22 48.493750950   13.4 12.487 11.7 10.503 K7 22 0
51 GSC 06204-00812 Ro* 16 03 02.6800592025 -18 06 05.022614702   12.8 12.214   10.631 M0 15 0
52 2MASS J16032367-1751422 pr* 16 03 23.6578461600 -17 51 42.485175802   14.94 13.34 13.10   M2e 11 0
53 RX J1603.9-2031B TT* 16 03 54.9650645285 -20 31 38.560797344   14.0 13.205 12.20 10.932 M0 23 0
54 2MASS J16035767-2031055 TT* 16 03 57.6711988104 -20 31 05.603641039   13.4   11.73 10.92 K5 45 0
55 RX J160421-21307 TT* 16 04 20.9770687478 -21 30 41.699585480   16.6     11.99 M2 22 0
56 2MASS J16042165-2130284 pr* 16 04 21.6546714640 -21 30 28.549578725   13.3       K2 94 0
57 ScoPMS 27 BY* 16 04 47.7526785430 -19 30 22.916995440   12.43 11.254   9.822 K3IVe 44 0
58 ScoPMS 28 TT* 16 05 27.2685792995 -19 38 46.709468605           M1V 14 0
59 2MASS J16053936-2152338 pr* 16 05 39.3661708456 -21 52 33.834082837   15.8 13.13 13.6   M3.5 11 0
60 ScoPMS 29 TT* 16 05 42.6748988870 -20 04 15.248975876           M2V 17 0
61 2MASS J16055065-2533136 TT* 16 05 50.6524424441 -25 33 13.618046485   11.87 10.895   9.797 K1V(e) 20 0
62 ASAS J160612-2036.8 Ro* 16 06 12.5410241973 -20 36 47.293170743   14.0 12.737 12.5 10.838 K5 19 0
63 ScoPMS 31 TT* 16 06 21.9391622360 -19 28 44.803623004           M0.5V 38 0
64 2MASS J16063741-2108404 pr* 16 06 37.414 -21 08 40.46   15.1   13.2   M1 9 0
65 ScoPMS 32 TT* 16 06 39.9046434424 -20 01 28.191880793           M3V 15 0
66 1RXS J160652.6-241627 TT* 16 06 54.388800 -24 16 10.84908   14.05 12.72 12.61   M3e 21 0
67 RX J1607.0-2036 Ro* 16 07 03.562320 -20 36 26.49204   13.54 12.232 11.75 10.334 M0 18 1
68 2MASS J16070373-2043074 TT* 16 07 03.7303351315 -20 43 07.425591363   16.0 14.51 13.6   M1 14 0
69 RX J1607.0-1911 TT* 16 07 03.9435547235 -19 11 33.953233201     14.207   11.782 M1 22 0
70 TYC 6209-735-1 Ro* 16 08 14.7429576484 -19 08 32.679096036   13.01 11.403   9.962 K2 34 0
71 2MASS J16083138-1802414 pr* 16 08 31.3764048141 -18 02 41.463956732   14.0       M0 17 0
72 2MASS J16084340-2602168 TT* 16 08 43.4066523873 -26 02 16.778311670   11.16 10.380   9.265 G9V(e) 25 0
73 2MASS J16085673-2033460 pr* 16 08 56.7301065518 -20 33 45.839270309   13.3       K5 23 0
74 RX J1609.5-2105 pr* 16 09 30.3076191853 -21 04 58.945280778   14.21 12.77 12.25 10.99 M0.0e 75 0
75 2MASS J16094098-2217594 TT* 16 09 40.9929450218 -22 17 59.527476992   13.8 12.561   10.655 M0 26 0
76 [PZ99] J161019.1-250230 TT* 16 10 19.1889409493 -25 02 30.225971914   13.50 11.978 11.55 10.26 K5V(e) 25 0
77 ScoPMS 42b TT* 16 10 21.7428782594 -19 04 06.589852915           M1V 21 0
78 ScoPMS 42a TT* 16 10 28.5645122172 -19 04 47.282366707           M3V 26 0
79 GSC 06213-01459 Ro* 16 10 42.0230725669 -21 01 32.069697208   13.4 12.373   10.627 K5 13 0
80 Wa Oph 1 Or* 16 11 08.9066752575 -19 04 46.972012700     12.073   10.194 K2IV(e) 61 0
81 ScoPMS 45 BY* 16 11 20.5773592889 -18 20 55.035157447           K5IV 25 0
82 V* V866 Sco Or* 16 11 31.345632 -18 38 25.96200   13.98 12.63 12.81   K0e+K5e 247 0
83 2MASS J16115633-2304051 pr* 16 11 56.334 -23 04 05.14   14.2 11.92     M1 15 0
84 Wa Oph 2 Or* 16 11 59.2701883216 -19 06 53.315967884       11.57   K2Ve 60 0
85 NAME Upper Sco Association As* 16 12 -23.4           ~ 1055 1
86 ScoPMS 51 SB* 16 12 20.9257958861 -19 09 04.109819892           M2.5V 21 0
87 BD-18 4244 Or* 16 12 40.5142870003 -18 59 28.267064720   12.15 10.829   9.235 K0IV(e) 84 0
88 2MASS J16130271-2257446 TT* 16 13 02.7175658951 -22 57 44.493917732   12.6 11.813   10.265 K5 29 0
89 BD-21 4301 pr* 16 13 18.5820811209 -22 12 49.029867880   11.43 10.432   9.105 K1IV(e) 37 0
90 2MASS J16132929-2311075 TT* 16 13 29.2885274246 -23 11 07.575773201   12.5 11.660   10.231 K1 34 0
91 2MASS J16140211-2301021 TT* 16 14 02.1139179545 -23 01 02.186787628   12.2       G4 32 0
92 CD-22 11432 TT* 16 14 11.0697507472 -23 05 36.071480044   11.90 10.70   9.255 K2IV 67 0
93 2MASS J16141394-1938282 * 16 14 13.9470003385 -19 38 28.148557243           K2 5 0
94 2MASS J16145918-2750230 TT* 16 14 59.1828558200 -27 50 22.941507032   12.09 11.205   10.052 K0IV(e) 39 0
95 NAME ASSOC II SCO As* 16 15 -24.2           ~ 1143 1
96 V* VV Sco Or* 16 15 34.56528 -22 42 42.1092     12.684   10.660 K5Ve+M0Ve 47 0
97 2MASS J16161795-2339476 TT* 16 16 17.9463268206 -23 39 47.540689812   11.42 10.685   9.525 G9IV 37 0
98 HD 146516 TT* 16 17 31.3910380745 -23 03 36.124650500     10.143   9.130 G7V 43 0
99 2MASS J16193396-2228294 TT* 16 19 33.9665182116 -22 28 29.467178147   12.72 11.312   10.065 K1IV 28 0
100 RX J1620.7-2348 TT* 16 20 45.9586954438 -23 48 20.906803470           ~ 20 0
101 Haro 1-1 Or* 16 21 34.7046243951 -26 12 26.914958774   14.59       K5e 57 0
102 CD-22 11523 Or* 16 23 07.8222126846 -23 00 59.994661616   13.10 11.85 11.71 10.290 K5 31 0
103 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 3067 0
104 BD-21 4369 BY* 16 29 48.6929181158 -21 52 11.930870950   12.54 11.315   9.740 K2IVe 41 0
105 * zet Oph Be* 16 37 09.5390545 -10 34 01.529471 1.73 2.58 2.56 2.46 2.50 O9.2IVnn 1738 2
106 NAME Sco OB 1 As* 16 53.5 -41 57           ~ 195 0
107 NAME Cen-Lup As* ~ ~           ~ 11 0

    Equat.    Gal    SGal    Ecl

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2020.10.29-22:23:23

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