2017ApJ...850...11D

Query : 2017ApJ...850...11D

2017ApJ...850...11D - Astrophys. J., 850, 11-11 (2017/November-3)

New parallaxes for the Upper Scorpius OB association.

DONALDSON J.K., WEINBERGER A.J., GAGNE J., BOSS A.P. and KEISER S.A.

Abstract (from CDS):

Upper Scorpius is a subgroup of the nearest OB association, Scorpius-Centaurus. Its young age makes it an important association to study star and planet formation. We present parallaxes to 52 low-mass stars in Upper Scorpius, 28 of which have full kinematics. We measure ages of the individual stars by combining our measured parallaxes with pre-main-sequence evolutionary tracks. We find a significant difference in the ages of stars with and without circumstellar disks. The stars without disks have a mean age of 4.9 ± 0.8 Myr and those with disks have an older mean age of 8.2 ± 0.9 Myr. This somewhat counterintuitive result suggests that evolutionary effects in young stars can dominate their apparent ages. We also attempt to use the 28 stars with full kinematics (i.e., proper motion, radial velocity (RV), and parallax) to trace the stars back in time to their original birthplace to obtain a trackback age. As expected, given the large measurement uncertainties on available RV measurements, we find that measurement uncertainties alone cause the group to diverge after a few Myr.

Abstract Copyright: © 2017. The American Astronomical Society. All rights reserved.

Journal keyword(s): open clusters and associations: individual: Upper Scorpius - stars: distances - stars: kinematics and dynamics - stars: pre-main sequence - stars: pre-main sequence

Simbad objects: 61

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Number of rows : 61
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 NAME TW Hya Association As* 11 01.9 -34 42           ~ 1018 0
2 NAME Lower Centaurus Crux As* 12 19 -57.1           ~ 565 1
3 NAME Upper Centaurus Lupus MGr 15 24 -41.9           ~ 567 1
4 RX J1551.1-2402 Or* 15 51 06.6015760608 -24 02 19.119444468   15.08 14.465 13.5 12.057 ~ 30 0
5 [PBB2002] USco J155624.8-222555 Or* 15 56 24.7721806584 -22 25 55.313778144           M4e 46 0
6 RX J155655.7-225841 Or* 15 56 55.4549931624 -22 58 40.400941476   15.38 13.90 13.66   M0.5e 34 0
7 [PBB2002] USco J155706.4-220606 Or* 15 57 06.4171109616 -22 06 06.069941460           M4e 45 0
8 UScoCTIO 13 Or* 15 57 29.8458656448 -22 58 44.104383876           M4e 42 0
9 [PBB2002] USco J155744.9-222351 * 15 57 44.909664 -22 23 51.60228   16.94 15.31 15.12   M2 13 0
10 RX J155829.5-231026 TT* 15 58 29.8128891888 -23 10 07.752769680           M3e 64 0
11 [PBB2002] USco J155918.4-221042 Or* 15 59 18.3920985168 -22 10 43.006914876         12.74 M4e 32 0
12 [PBB2002] USco J160004.3-223014 PM* 16 00 04.1422899936 -22 30 13.990192488           M3e 9 0
13 2MASS J16001330-2418106 Or* 16 00 13.3003897920 -24 18 10.678264560   14.6   13.1   M0.5e 31 0
14 [PBB2002] USco J160018.4-223011 Or* 16 00 18.4309283544 -22 30 11.535396696           M3e 35 0
15 RX J1601.1-2113 Or* 16 01 08.0169370824 -21 13 18.555249216   13.9 12.511 12.0 10.785 M0 35 0
16 [PBB2002] USco J160140.8-225810 ** 16 01 40.868760 -22 58 10.58520   15.67 15.30 15.37   M3e 34 0
17 [PGZ2001] J160159.7-195219 Or* 16 01 59.7591021000 -19 52 20.408187180   20.5       M5e 24 0
18 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
19 ** BOY 19AB Or* 16 02 02.8396188192 -22 36 14.140335636           ~ 14 0
20 UCAC2 22721845 ** 16 02 02.848872 -22 36 14.10408   17.79 16.05 15.77   M0e 20 0
21 [PGZ2001] J160226.2-200241 Or* 16 02 26.1637948824 -20 02 40.448941476           M5e 26 0
22 [PBB2002] USco J160258.5-225649 Or* 16 02 58.5545812152 -22 56 49.546155444           M2e 25 0
23 [PGZ2001] J160325.6-194438 Or* 16 03 25.6227318960 -19 44 38.437676772   17.3       M2e 15 0
24 [PGZ2001] J160329.4-195503 Or* 16 03 29.4048067512 -19 55 03.752481432           M5e 28 0
25 [PGZ2001] J160341.8-200557 Or* 16 03 41.8727241960 -20 05 57.702909336           M2e 36 0
26 RX J1603.9-2031 TT* 16 03 57.6711677256 -20 31 05.604697272   13.4   11.73 10.92 K5 75 0
27 [PGZ2001] J160357.9-194210 Or* 16 03 57.9355222272 -19 42 10.905101028           M2e 57 0
28 [PGZ2001] J160418.2-191055 Or* 16 04 18.2133340800 -19 10 55.805593116           M4e 22 0
29 ATO J241.0901-21.5080 Or* 16 04 21.6547947840 -21 30 28.550063304   13.3       K2 190 0
30 [PGZ2001] J160435.6-194830 Or* 16 04 35.6517266640 -19 48 30.300176088           M5e 23 0
31 [PGZ2001] J160439.1-194245 Or* 16 04 39.1707415848 -19 42 45.976064004           M4e 32 0
32 [PGZ2001] J160449.9-203835 Or* 16 04 49.9696451112 -20 38 35.539148292           M5e 26 0
33 [PGZ2001] J160516.1-193830 Or* 16 05 16.1573079792 -19 38 31.118154720   18.0       M4e 20 0
34 [PGZ2001] J160532.1-193315 LM* 16 05 32.1520016280 -19 33 16.012868364           M5e 73 0
35 [PGZ2001] J160545.4-202308 Or* 16 05 45.3995129856 -20 23 08.809297440           M2e 54 0
36 RX J1606.2-2036 TT* 16 06 12.5411330016 -20 36 47.292443280   14.0 12.737 12.5 10.838 K5 31 0
37 [PGZ2001] J160622.8-201124 Or* 16 06 22.7834979936 -20 11 24.359434620           M5e 49 0
38 [PGZ2001] J160643.8-190805 Or* 16 06 43.8620267616 -19 08 05.549732448           K6e 55 0
39 [PGZ2001] J160702.1-201938 LM* 16 07 02.11800 -20 19 38.7696           M5e 38 0
40 RX J1607.0-1911 TT* 16 07 03.9381893688 -19 11 33.973928988     14.207   11.782 M1 32 0
41 1RXS J160708.6-192737 Or* 16 07 08.7357563160 -19 27 34.255766448           M4e 36 0
42 [PGZ2001] J160719.7-202055 Or* 16 07 19.7245270800 -20 20 55.603271940           M3e 32 0
43 [PGZ2001] J160739.4-191747 Or* 16 07 39.3986260272 -19 17 47.249283444           M2e 37 0
44 [T64] 3 Or* 16 08 23.2468097568 -19 30 00.977031108         11.79 K9e 75 0
45 [PGZ2001] J160827.5-194904 Or* 16 08 27.5104444296 -19 49 05.061066924           M5e 40 0
46 2MASS J16083647-2445303 Or* 16 08 36.4780723296 -24 45 30.246814116           M3.25V 18 0
47 GSC 06209-01501 Or* 16 08 56.7301379616 -20 33 45.837138816   13.3       K5 35 0
48 [PBB2002] USco J160900.0-190836 Or* 16 09 00.0227996640 -19 08 36.865209012           M5e 51 0
49 [PGZ2001] J160900.7-190852 TT* 16 09 00.7592409720 -19 08 52.680361920           M1.0V 94 0
50 [PBB2002] USco J160953.6-175446 Or* 16 09 53.6173365312 -17 54 47.434100292           M3e 43 0
51 [PGZ2001] J160954.4-190654 Or* 16 09 54.4143597864 -19 06 55.045336464   15.9       M1e 40 0
52 [PGZ2001] J160959.4-180009 Or* 16 09 59.3313757080 -18 00 09.066833856           M5e 54 0
53 [PBB2002] USco J161011.0-194603 Or* 16 10 11.0064674376 -19 46 03.942814476   18.9       M5e 30 0
54 K2-33 Or* 16 10 14.7377409264 -19 19 09.407629452   17.353       dM3.0 107 0
55 [PGZ2001] J161024.7-191407 Or* 16 10 24.7411891272 -19 14 07.288720548   17.2       M3e 26 0
56 [PBB2002] USco J161052.4-193734 Or* 16 10 52.4121215208 -19 37 34.367494512           M3e 32 0
57 1RXS J161115.1-175741 Or* 16 11 15.3441540480 -17 57 21.429672984           M1e 54 0
58 NAME Upper Sco Association As* 16 12 -23.4           ~ 1586 1
59 NAME Upper Sco-Cen As* 16 15 -24.2           ~ 1497 1
60 2MASS J16211563-2436117 Or* 16 21 15.6536555640 -24 36 11.748359808           M3.5 12 0
61 2MASS J16212488-2426145 Or* 16 21 24.8974144536 -24 26 14.444664864           M3.5 22 0

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