2002AJ....124.1670M

Query : 2002AJ....124.1670M

2002AJ....124.1670M - Astron. J., 124, 1670-1694 (2002/September-0)

Post-T Tauri stars in the nearest OB association.

MAMAJEK E.E., MEYER M.R. and LIEBERT J.

Abstract (from CDS):

We present results of a spectroscopic survey of X-ray- and proper-motion-selected samples of late-type stars in the Lower Centaurus-Crux (LCC) and Upper Centaurus-Lupus (UCL) subgroups of the nearest OB association: Scorpius-Centaurus. The primary goals of the survey are to determine the star formation history of the OB subgroups and to assess the frequency of accreting stars in a sample dominated by ``post-T Tauri'' pre-main-sequence (PMS) stars. We investigate two samples: (1) proper-motion candidates from the ACT Catalog and Tycho Reference Catalog (TRC) with X-ray counterparts in the ROSAT All-Sky Survey (RASS) Bright Source Catalog and (2) G- and K-type stars in the Hipparcos catalog found to be candidate members by de Zeeuw et al. We obtained optical spectra of 130 candidates with the Siding Spring 2.3 m dual-beam spectrograph. PMS stars were identified by (1) strong Li λ6707 absorption, (2) subgiant surface gravities, (3) proper motions consistent with Sco-Cen membership, and (4) H-R diagram positions consistent with being PMS. We find 93% of the RASS-ACT/TRC stars to be probable PMS members, compared with 73% of the Hipparcos candidates. We demonstrate that measuring the gravity-sensitive band ratio of Sr II λ4077 to Fe I λ4071 is a valuable means of discriminating PMS and zero-age main-sequence (ZAMS) stars. Using secular parallaxes and Hipparcos, Tycho-2, and Two Micron All Sky Survey photometry, we construct an H-R diagram. Depending on the choice of published evolutionary tracks, we find the mean ages of the PMS populations to range between 17 and 23 Myr for LCC and 15 and 22 Myr for UCL. Taking into account observational errors, it appears that 95% of the low-mass star formation in each subgroup must have occurred in less than 8 Myr (LCC) and 12 Myr (UCL). Using the Bertelli et al. tracks, we find main-sequence turnoff ages for Hipparcos B-type members to be 16±1 Myr for LCC and 17±1 Myr for UCL. Contrary to previous findings, it appears that LCC is coeval with, or slightly older than, UCL. The secular parallaxes of the Sco-Cen PMS stars yield distances of 85-215 pc, with 12 of the LCC members lying within 100 pc of the Sun. Only one out of 110 (0.9+2.1–0.8%; 1 σ) PMS solar-type stars in the sample with ages of 13±1 (s.e.)±6 (1 σ) Myr and masses of 1.3±0.2 (1 σ) M☉ shows both enhanced Hα emission and a K-band excess indicative of accretion from a truncated circumstellar disk: the nearby (d≃86 pc) classical T Tauri star PDS 66.

Abstract Copyright: ∼

Journal keyword(s): Galaxy: Open Clusters and Associations: Individual: Name: Scorpius OB2 - open clusters and associations: individual (Lower Centaurus-Crux, Upper Centaurus-Lupus) - Stars: Activity - Stars: Formation - Stars: Kinematics - Stars: Pre-Main-Sequence - X-Rays

VizieR on-line data: <Available at CDS (J/AJ/124/1670): table1 table2 table3 table4 table5 table6 notes>

Nomenclature: Table 5: MML NN (Nos 1-88).

Errata: erratum vol. 131, p. 2360 (2006)

Simbad objects: 149

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Number of rows : 149
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 HD 84117 PM* 09 42 14.4162029298 -23 54 56.042043626   5.47 4.94     F9V 233 0
2 * 35 Leo PM* 10 16 32.2892262264 +23 30 11.206765404 6.85 6.64   5.6   G1.5IV-V 170 0
3 HD 94481 * 10 54 17.7770384160 -13 45 28.935080424   6.487 5.651     G4III-IIIb 68 0
4 CPD-68 1388 Or* 10 57 49.3755342696 -69 13 59.950499520   11.34 10.310   9.163 K1V(e) 32 0
5 * alf Crt PM* 10 59 46.4651557828 -18 17 55.630394216 6.14 5.16 4.07 3.27 2.72 K0IIIb 224 0
6 HD 304428 Or* 11 32 08.3474680896 -58 03 20.080914228   10.82 9.866   8.952 K1IV(e) 20 0
7 CD-48 6632 * 11 35 03.7637834856 -48 50 21.973735500   10.95 10.27     G7V 15 0
8 HD 102458 Or* 11 47 24.5438206248 -49 53 03.018484572   9.70 9.07   8.40 G4V 102 0
9 CPD-63 2126 Er* 12 04 14.4110932104 -64 18 51.600471300   10.69 10.02   9.362 G8V 15 0
10 HD 104919 Or* 12 04 48.8627181888 -64 09 55.426686300   10.12 9.391   8.687 G9V 21 0
11 HD 105070 Or* 12 05 47.4817082016 -51 00 12.070921608   9.50 9.005   8.216 G2IV 43 1
12 CD-56 4292 Or* 12 06 13.5281595888 -57 02 16.770164676   11.42 10.620   9.762 G8IV(e) 14 0
13 CD-58 4411 Or* 12 09 41.8589011752 -58 54 45.061630056   11.29 10.33 10.12   K1Ve 45 0
14 CD-57 4328 Or* 12 11 31.4224548744 -58 16 53.232914028   11.07 10.327   9.327 G9V(e) 25 0
15 HD 105923 Or* 12 11 38.1470604024 -71 10 36.027201000   9.86 9.140   8.286 G8V 36 0
16 CD-54 4621 Or* 12 12 35.7599042112 -55 20 27.293187660   11.44 10.498   9.328 K0Ve 41 0
17 CD-50 6815 Or* 12 14 34.0907023656 -51 10 12.505288980   11.20 10.275   9.167 G9V 42 0
18 CD-55 4499 Or* 12 14 52.3085633712 -55 47 03.633282888   10.45 9.64     G9V(e) 40 0
19 HD 106725 ** 12 16 27.84061 -50 08 35.8157   10.015 9.551 9.660 8.539 G3V 27 0
20 CD-59 4205 Y*O 12 18 27.640608 -59 43 13.03608   11.40 10.43 10.25 9.333 K2Ve 10 0
21 CD-56 4401 Or* 12 18 58.0240118448 -57 37 19.146216972   10.76 9.853   8.765 K1IV(e) 20 0
22 NAME Lower Centaurus Crux As* 12 19 -57.1           ~ 565 1
23 CPD-64 1859 Or* 12 19 21.6378016896 -64 54 10.321434324 11.48 10.87 9.90   8.907 K3V 21 0
24 HD 107441 Or* 12 21 16.4790326952 -53 17 44.968738236   10.02 9.350   8.566 G8IV 38 0
25 CD-49 7027 Or* 12 21 55.6590902616 -49 46 12.443074608   10.81 10.001   9.050 G9V 42 0
26 CD-47 7559 Or* 12 22 04.2988090656 -48 41 24.953627940   11.34 10.618   9.562 K1Ve 32 0
27 CD-52 5008 Or* 12 22 33.2330251464 -53 33 48.976329924   10.06 9.414   8.682 G2IV 29 0
28 CD-55 4588 Or* 12 23 40.1267493864 -56 16 32.549137392   11.67 10.755   9.060 K2V 30 0
29 HD 108568 Or* 12 28 40.0538161512 -55 27 19.335000636   9.50 8.954   8.269 G1IV 35 1
30 HD 108611 Or* 12 29 02.2523641896 -64 55 00.636825720   9.75 9.05     G5V 42 1
31 CPD-63 2367 Or* 12 36 38.9779337112 -63 44 43.520073000   10.83 10.028   8.951 K2V 18 0
32 CPD-53 5235 Or* 12 36 58.9657085280 -54 12 18.000711900   11.33 10.414   9.355 K0V 27 0
33 CD-56 4581 Or* 12 39 37.9543414320 -57 31 40.595454840   10.90 10.272   9.320 G9V 24 0
34 HD 110244 Or* 12 41 18.1768683216 -58 25 55.975874628   10.65 9.93   8.875 G7IV(e) 22 0
35 V* FI Cru Or* 12 44 34.8060686304 -63 31 46.231540320   11.97 10.78   9.534 K3Ve 23 0
36 HD 110817 Or* 12 45 06.7589417232 -47 42 58.201897716   11.16 10.388   9.411 K1Ve 37 0
37 V* V940 Cen Or* 12 47 51.8732023464 -51 26 38.207742864   10.33 9.52     G9IVe 47 0
38 HD 111227 Or* 12 48 07.7926675992 -44 39 16.795090548   10.54 9.844   8.786 K0IV(e) 26 0
39 CD-55 4799 Or* 12 48 48.1794504384 -56 35 37.820103936   11.04 10.393   9.482 G8IV 26 0
40 CD-69 1055 Or* 12 58 25.5840183960 -70 28 49.148391324   10.77 9.992   8.941 K0Ve 50 0
41 CPD-52 6110 Or* 13 01 50.6980984080 -53 04 58.162656612   11.98 11.08   10.154 K3V(e) 43 0
42 HD 113180 Or* 13 02 37.5260743368 -54 59 36.875358132   10.93 10.28     G1V 14 0
43 HD 113376 SB* 13 04 30.9673296408 -65 55 18.463914660   9.17 8.49     G3V 46 0
44 HD 113466 Or* 13 05 05.2865320992 -64 13 55.284308472   9.90 9.17     G4V 46 0
45 CD-51 7268 Or* 13 06 40.1232659280 -51 59 38.619014100   11.33 10.53 10.25   K1V(e) 25 0
46 CD-59 4629 Or* 13 13 28.1043352752 -60 00 44.674193484   10.64 10.080   9.356 G3V 18 0
47 * 55 Vir PM* 13 14 10.8951509520 -19 55 51.404410380   6.20 5.33     G7IV 137 0
48 CD-50 7600 Or* 13 14 23.8377410136 -50 54 01.945210428   11.24 10.302   9.330 G9IV(e) 22 0
49 CD-52 5536 Or* 13 17 56.9395893960 -53 17 56.263075872   11.06 10.41   9.570 G5IV 14 0
50 * 61 Vir PM* 13 18 24.3139864471 -18 18 40.297748582 5.710 5.440 4.740     G6.5V 742 1
51 HD 116099 Or* 13 22 04.4690952144 -45 03 23.174461008   10.71 10.02   9.03 G2IV 33 0
52 CPD-68 1894 TT* 13 22 07.5421944624 -69 38 12.219391716   11.38 10.393   9.117 K1Ve 203 0
53 HD 116402 Y*O 13 24 35.1210507312 -55 57 24.161753592   10.23 9.658   8.988 G3V 48 0
54 V* V966 Cen Or* 13 25 47.8321566936 -48 14 57.846569964   10.37 9.77     G2V 48 0
55 * 70 Vir PM* 13 28 25.8085908881 +13 46 43.638308807 5.930 5.680 4.970 4.37 3.98 G4Va 754 1
56 HD 117524 Or* 13 31 53.6065402944 -51 13 33.260046672   10.60 9.892   8.984 G8V 51 0
57 HD 117884 Or* 13 34 20.2592027400 -52 40 36.120494100   9.94 9.395   8.603 G2IV 19 0
58 CD-40 8031 Or* 13 37 57.2943420144 -41 34 41.898243792   10.93 10.006   9.040 K0IV 42 0
59 HD 119022 Or* 13 43 08.6942842 -69 07 39.480199   9.01 7.644   6.824 G5IV 47 1
60 HD 119269 Or* 13 43 28.5307936104 -54 36 43.484804784   10.01 9.32     G3V 38 0
61 CD-48 8486 Or* 13 47 50.5516888656 -49 02 05.584959852   11.61 10.82     G9IVe 26 0
62 HD 120467 PM* 13 49 44.8063802009 -22 06 39.931905725 10.69 9.427 8.166 7.394 6.777 K6Va 139 1
63 HD 120411 * 13 50 06.2797027704 -40 50 08.881076364   10.45 9.80     G0V 78 0
64 HD 120812 Or* 13 52 47.7896075064 -46 44 09.203459748   10.27 9.674   8.906 F8V 22 0
65 * eta Boo SB* 13 54 41.07892 +18 23 51.7946 3.440 3.250 2.680 2.24 1.95 G0IV 733 0
66 CD-41 8400 Or* 14 02 20.7268476600 -41 44 50.839574352   11.51 10.677   9.671 G9Ve 33 0
67 HD 122683 * 14 04 07.1015759904 -37 15 50.471329896   7.86 7.11     G3IV/V 28 0
68 HD 123484 Or* 14 09 03.5746016472 -44 38 44.323717632   10.02 9.39     K0/1+G 25 0
69 HD 124329 EB* 14 16 05.5927563912 -69 17 36.112154856   10.66 9.99 10.10 9.289 G2V 12 0
70 V* V636 Cen EB* 14 16 57.9122377992 -49 56 42.372930480   9.70 9.09     G0V 102 0
71 CD-46 9327 Or* 14 27 05.5556875152 -47 14 21.748559964   11.42 10.585   9.639 G9V 35 0
72 HD 126670 Or* 14 28 09.2968560360 -44 14 17.490215544   10.58 9.791   8.891 G8V 28 0
73 * phi Vir RG* 14 28 12.1389021744 -02 13 40.649015856   5.522 4.840     G2IV 204 0
74 CD-41 8792 Or* 14 28 19.3671442536 -42 19 34.099789836   11.17 10.47     G8IV(e) 17 0
75 V* V1009 Cen Or* 14 33 25.7760395520 -34 32 37.713261264   10.97 10.11     G9IV 26 0
76 HD 128242 Y*O 14 37 04.222752 -41 45 02.94732   10.492 9.859 9.799 8.767 G2IV 17 0
77 CD-54 5780 Or* 14 37 50.2253706384 -54 57 41.230787040   11.41 12.533   10.437 K1V(e) 23 0
78 CD-46 9495 Or* 14 41 34.9997548392 -47 00 28.784184012   10.79 9.986   8.959 G8IV 22 0
79 HD 129590 * 14 44 30.9625895592 -39 59 20.628246480   9.96 9.33     G3V 73 0
80 CD-47 9419 Or* 14 47 31.7758829136 -48 00 05.650033824   11.39 10.72     G6V 12 0
81 CD-34 9963 Or* 14 50 25.8136658904 -35 06 48.579544512   11.59 10.671   9.568 K1Ve 24 0
82 CD-41 9236 Or* 14 52 41.9828809536 -41 41 55.246521084   12.05 11.146   9.894 K3IVe 23 0
83 V* DE Boo RS* 14 53 23.7654730144 +19 09 10.072718521   6.84 6.00 5.5   K0.5V 287 0
84 CD-35 9918 Or* 14 57 19.6301534424 -36 12 27.442091808   11.12 10.268   9.368 G8V 28 0
85 HD 131977 BY* 14 57 28.0007918772 -21 24 55.727265310 7.89 6.83 5.72 4.74 4.19 K4V 525 0
86 CD-35 9931 TT* 14 58 37.6872422736 -35 40 30.394769052   11.92 10.75   9.85 K2.5IV 35 0
87 HD 132264 TT* 14 59 22.7645277888 -40 13 12.104884740   10.48 9.814   8.960 G7IV 24 0
88 CD-43 9534 TT* 15 00 51.8936603520 -43 31 21.155318508   11.87 11.15   10.134 K0IV(e) 29 0
89 CD-40 9190 TT* 15 01 11.5537626048 -41 20 40.606710360   10.70 10.087   9.310 G3V 16 0
90 CD-47 9621 Or* 15 01 58.8193812528 -47 55 46.465918392   10.80 10.187   9.404 G4V 22 0
91 CD-34 10180 TT* 15 07 14.8172880480 -35 04 59.527866036 11.84 11.37 10.662 10.02 9.631 K0IVe 39 0
92 CD-43 9640 Ro* 15 08 00.5447500584 -43 36 24.844083408   10.61 9.84   8.906 G7III 8 0
93 V* LQ Lup TT* 15 08 37.7353724976 -44 23 17.049423444 11.46 11.54 10.645 10.22 9.804 G8IVe 97 0
94 HD 133938 TT* 15 08 38.5032196584 -44 00 51.979269132 11.26 11.17 10.54 9.97 9.56 G6V 34 0
95 CD-46 9829 Ro* 15 09 27.9280236168 -46 50 57.236521704   11.45 10.344   9.175 K0III 7 0
96 CD-44 9931 TT* 15 12 50.1796869720 -45 08 04.464448224   11.46 10.529   9.598 G8V 20 0
97 HD 134672 Or* 15 13 29.2233144072 -55 43 54.562817064   8.23 7.49     G2IV 24 0
98 CD-52 6550 Or* 15 18 01.7463658656 -53 17 28.866197580   10.88 10.138   9.201 G9IV 15 0
99 V* LW Lup TT* 15 18 26.9192118480 -37 38 02.070123108 12.23 11.79 10.891 10.41 9.850 K0IVe 41 0
100 NAME Upper Centaurus Lupus MGr 15 24 -41.9           ~ 567 1
101 V* MS Lup TT* 15 25 59.6471855904 -45 01 15.821666004 11.97 11.67 10.969 10.42 10.041 G7IV 43 0
102 CD-35 10323 Or* 15 29 38.5729786728 -35 46 51.415549788   11.37 10.674   9.514 K1IVe 18 0
103 HD 138009 TT* 15 30 26.23621 -32 18 12.9163   10.01 9.47 9.27   G6V 38 0
104 CD-33 10568 TT* 15 31 21.9300091656 -33 29 39.448367196   11.56 10.834   9.860 G9IV 28 0
105 CD-31 12102 Y*O 15 37 02.14 -31 36 39.8           ~ 6 0
106 HD 138995 Or* 15 37 04.6580704464 -40 09 22.163133348   10.11 9.439   8.608 G6Ve 35 0
107 CD-39 10026 Or* 15 37 11.3009153880 -40 15 56.815280748   11.49 10.681   9.636 K2IVe 27 0
108 CD-43 10072 Or* 15 38 43.0706398200 -44 11 47.418986976   11.03 10.28   9.512 G6IV(e) 33 0
109 HD 139498 Y*O 15 39 24.41463 -27 10 22.0625   10.94 10.21     G8V 26 0
110 HD 140129 * 15 43 29.8637275800 -38 57 38.586379032   10.27 9.64 9.870   G3V 25 0
111 CD-32 11039 TT* 15 44 03.7731048192 -33 11 11.204274192   11.71 10.87 10.744   K0IVe 29 0
112 HD 140374 Or* 15 44 21.0522053304 -33 18 54.956917800   10.44 9.66     G8V 52 0
113 HD 140463 ** 15 44 57.69045 -34 11 53.6836           G6/8IV/V 22 0
114 HD 140421 Or* 15 45 01.8317313912 -40 50 30.977846592   10.04 9.488   8.745 G0V 33 0
115 CD-41 10274 TT* 15 45 52.2379435876 -42 22 16.440808058   11.50 10.50   9.438 K3IVe 22 0
116 HD 329929 Or* 15 46 51.7951835760 -49 19 04.706653116   11.10 10.18   9.424 K0V 18 0
117 HD 141277 TT* 15 49 44.9775230 -39 25 09.113328   11.40 10.640   9.523 K1IV(e) 33 0
118 HD 141521 Or* 15 51 13.7316442152 -42 18 51.332321016   10.98 10.25     G8IV 50 0
119 CD-39 10243 Or* 15 56 59.0521088160 -39 33 42.970655520   11.64 10.680   9.747 K0V(e) 13 0
120 HD 143358 Or* 16 01 07.9270087608 -32 54 52.527198420   10.32 9.647   8.911 G1V 28 0
121 V* MZ Lup TT* 16 01 08.9697543744 -33 20 14.177235192 12.11 11.88 10.88 10.35 9.812 G5IVe 34 0
122 HD 143677 TT* 16 03 45.3645926 -43 55 49.198300 11.09 10.57 9.681 9.14 8.664 K0IV 46 1
123 CD-39 10292 TT* 16 03 52.5008065896 -39 39 01.266425244 12.83 12.00 11.01 10.38 9.79 K3V 32 0
124 CD-38 10866 TT* 16 05 45.0016393344 -39 06 06.533278704 11.60 11.41 10.584 10.02 9.645 K0Ve 31 0
125 CD-35 10827 Or* 16 13 58.0159147776 -36 18 13.379117400   11.950 11.070 10.999 9.826 K0V(e) 19 0
126 HD 145839 ** 16 14 43.01958 -38 38 43.5150           G1/2V 18 0
127 CD-50 10271 Y*O 16 14 52.07040 -50 26 18.7908   11.24 10.41 10.173 9.167 K1V 16 0
128 NAME Upper Sco-Cen As* 16 15 -24.2           ~ 1497 1
129 * 18 Sco PM* 16 15 37.2702755653 -08 22 09.982125430   6.15 5.50     G2Va 671 0
130 HD 146610 Or* 16 18 38.5627217088 -38 39 11.807309088   9.65 9.02     G0V 33 0
131 HD 147048 TT* 16 21 12.1943779488 -40 30 20.599834284 11.64 11.45 10.482 9.96 9.524 G9IV 25 0
132 HD 147402 TT* 16 23 29.5554512712 -39 58 00.847339680 11.63 11.42 10.64 10.40 10.03 G3IV 25 0
133 CD-37 10801 Or* 16 27 30.5466594840 -37 49 21.554333148   11.71 11.011   10.000 K0IV 17 0
134 V* V1056 Sco Or* 16 27 52.3353770448 -35 47 00.388703328   10.00 9.379   8.512 G6IV 40 0
135 CD-34 11046 Or* 16 31 42.0374792688 -35 05 17.210271552   11.36 10.64   9.782 K0V 13 0
136 CD-33 11278 Or* 16 35 35.9926778280 -33 26 34.793483460   11.82 11.00     ~ 9 0
137 HD 149551 * 16 37 12.8667911712 -39 00 38.068105500   10.51 9.92     G2V 30 0
138 HD 149735 * 16 38 05.5283099640 -34 01 10.633891836   9.64 9.14     G0V 24 0
139 HD 149777 * 16 38 38.4692332152 -39 33 03.562912152   9.64 8.98     F8V 28 0
140 HD 321857 Or* 16 39 59.2857603744 -39 24 59.268371292   11.34 10.408   9.387 G8V 12 0
141 HD 150418 * 16 42 10.3625544048 -31 30 14.967478728   10.11 9.52     G5V 20 0
142 HD 150372 Or* 16 42 23.9982459672 -40 03 29.646013608   10.40 9.62     G5IV(e) 16 0
143 * 84 Her PM* 17 43 21.5645208624 +24 19 40.156969404   6.394 5.729     G2IIIb 156 0
144 HD 165438 RG* 18 06 15.1971057528 -04 45 04.508774964   6.726 5.741     K1IV 86 0
145 * 71 Oph * 18 07 18.3593981592 +08 44 01.922061912   5.592 4.640     G8III 182 0
146 * 110 Her PM* 18 45 39.7256792847 +20 32 46.713086264 4.66 4.65 4.19 3.80 3.54 F5.5IV-V 427 0
147 * del Aql ** 19 25 29.90139 +03 06 53.2061 3.72 3.68 3.36 3.11 2.95 F1IV-V(n) 247 0
148 * bet Aql PM* 19 55 18.7928429719 +06 24 24.351242346 5.040 4.560 3.710 3.05 2.56 G8IV 578 0
149 * ome Sgr SB* 19 55 50.3625499909 -26 17 57.693299065   5.45 4.70     G5IV 146 0

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