2011ApJ...727...62R

Query : 2011ApJ...727...62R

2011ApJ...727...62R - Astrophys. J., 727, 62 (2011/February-1)

A new method to identify nearby, young, low-mass stars.

RODRIGUEZ D.R., BESSELL M.S., ZUCKERMAN B. and KASTNER J.H.

Abstract (from CDS):

We describe a new method to identify young, late-type stars within ∼150 pc of the Earth that employs visual or near-infrared (NIR) data and the GALEX GR4/5 database. For spectral types later than K5, we demonstrate that the ratio of GALEX near-ultraviolet to visual and NIR emission is larger for stars with ages between 10 and 100 Myr than for older, main-sequence stars. A search in regions of the sky encompassing the TW Hya and Scorpius-Centaurus Associations has returned 54 high-quality candidates for follow up. Spectroscopic observations of 24 of these M1-M5 objects reveal Li 6708 Å absorption in at least 17 systems. Because GALEX surveys have covered a significant fraction of the sky, this methodology should prove valuable for future young star studies.

Abstract Copyright: ∼

Journal keyword(s): open clusters and associations: individual (Lower Centaurus Crux, Upper Centaurus Lupus, TW Hydrae) - stars: evolution - stars: pre-main sequence - ultraviolet: stars

CDS comments: TWA 32 is 2MASS J12265135-3316124 in SIMBAD.

Simbad objects: 64

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Number of rows : 64
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 Taurus Complex SFR 04 41.0 +25 52           ~ 4971 0
2 V* AB Dor TT* 05 28 44.8712165880 -65 26 55.199147208 8.259 7.856 6.999 6.496 5.993 K0V 1080 0
3 ASAS J102521-4241.9 Y*? 10 25 20.9179576824 -42 41 53.952972972   14.154 12.729 12.296 10.686 M1 26 0
4 [M81] I-308 Ro* 10 26 02.1058855128 -41 05 53.861073972     12.290   10.423 M0.5 17 0
5 BD+01 2447 PM* 10 28 55.5512830314 +00 50 27.598904576 12.389 11.151 9.650 8.617 7.389 dM2 361 0
6 V* TW Hya TT* 11 01 51.9053285064 -34 42 17.033218380   11.94 10.50 10.626 9.18 K6Ve 2144 1
7 NAME TW Hya Association As* 11 01.9 -34 42           ~ 1018 0
8 ASAS J110336-3024.8 EB* 11 03 35.7168529344 -30 24 49.530155112   13.665 12.448 12.147   K5V+M4/6V 2 0
9 RX J1125.8-4410 ** 11 25 47.548392 -44 10 26.68008   16.25 14.63 14.42 11.944 M4 13 0
10 2MASS J11311482-4826279 * 11 31 14.8294011552 -48 26 28.017057192           ~ 3 0
11 2MASS J11361906-5230542 NIR 11 36 18.9866154618 -52 30 54.373115570           ~ 1 0
12 2MASS J11462310-5238519 LM* 11 46 23.0988432600 -52 38 52.012052304           ~ 7 0
13 TWA 45 Em* 11 59 27.8704643568 -45 10 19.244599752   16.19 14.54     ~ 14 0
14 2MASS J11595770-2622340 Y*? 11 59 57.7032470688 -26 22 34.044637512           ~ 2 0
15 TYC 6098-784-1 PM* 12 06 47.4274804296 -19 20 53.182545612   12.39 12.21     ~ 4 0
16 2MASS J12083700-2127291 NIR 12 08 37.008 -21 27 29.20           ~ 1 0
17 2MASS J12182363-3515098 NIR 12 18 23.640 -35 15 09.82           ~ 1 0
18 NAME Lower Centaurus Crux As* 12 19 -57.1           ~ 565 1
19 2MASS J12195355-7420093 Y*? 12 19 53.6020380672 -74 20 09.352246992           ~ 7 0
20 TWA 32 ** 12 26 51.366576 -33 16 12.54324   17.21 16.00 15.73   M6.3 32 0
21 UCAC4 222-063706 * 12 27 25.2916137720 -45 40 06.604171284   13.247 12.168 11.969   ~ 4 0
22 2MASS J12300521-4402359 Y*? 12 30 05.2155480192 -44 02 35.968898184           ~ 8 0
23 2MASS J12405411-4516252 Y*? 12 40 54.1197599088 -45 16 25.311937368           ~ 7 0
24 2MASS J12485169-4556205 Y*? 12 48 51.7030319736 -45 56 20.598709416           ~ 5 0
25 2MASS J12504775-4231487 Y*? 12 50 47.7593288544 -42 31 48.752068584           ~ 5 0
26 2MASS J12571732-4626527 Y*? 12 57 17.3246553744 -46 26 52.832859756           ~ 5 0
27 2MASS J13054624-4417370 Y*? 13 05 46.2429986664 -44 17 37.049598888           ~ 5 0
28 2MASS J13063183-4455093 Y*? 13 06 31.8427221432 -44 55 09.300057636           ~ 3 0
29 ASAS J131129-4252.8 Ro* 13 11 29.0271286392 -42 52 41.724569748   15.07 13.60 13.18 11.421 M0Ve 13 0
30 2MASS J13204201-4658353 * 13 20 42.0262096296 -46 58 35.306484060           ~ 3 0
31 2MASS J13270622-4330227 Y*? 13 27 06.2297039112 -43 30 22.762569060           ~ 5 0
32 2MASS J13281440-3929147 * 13 28 14.3945815824 -39 29 14.949367044           ~ 1 0
33 2MASS J13283028-3934067 NIR 13 28 30.288 -39 34 06.73           ~ 1 0
34 2MASS J13283247-4241436 Y*? 13 28 32.4717913968 -42 41 43.682824860           ~ 3 0
35 2MASS J13332966-3753195 Y*? 13 33 29.6614433256 -37 53 19.575225420           ~ 2 0
36 UCAC4 237-065515 Y*? 13 35 31.2000799464 -42 41 48.796306800   16.540 15.035 14.667 12.516 ~ 9 0
37 2MASS J13373839-4736297 * 13 37 38.3988543864 -47 36 29.715851232           ~ 14 0
38 2MASS J13485378-4850453 NIR 13 48 53.7259064120 -48 50 45.521448831           ~ 1 0
39 UCAC4 262-069313 Y*? 13 51 45.6706929336 -37 42 00.459439380   14.564 13.055 12.774   ~ 7 0
40 2MASS J13524567-4938327 Y*? 13 52 45.6765836424 -49 38 32.765463384           ~ 4 0
41 2MASS J14033758-5010477 Y*? 14 03 37.5867932664 -50 10 47.745313248           ~ 4 0
42 2MASS J14065091-5058546 Y*? 14 06 50.9144730216 -50 58 54.733174284           ~ 5 0
43 2MASS J14265175-3349356 Y*? 14 26 51.7513370976 -33 49 35.722802028           ~ 3 0
44 2MASS J14334561-3124412 Y*? 14 33 45.6126351384 -31 24 41.376092184           ~ 3 0
45 2MASS J14371322-3409209 Y*? 14 37 13.2269845080 -34 09 20.892325716           ~ 4 0
46 2MASS J14485880-3224083 * 14 48 58.7957611752 -32 24 08.420141520           ~ 4 0
47 2MASS J14503359-3420305 Y*? 14 50 33.5745609672 -34 20 30.578338428           ~ 3 0
48 2MASS J15063505-3639297 Y*? 15 06 35.0603463624 -36 39 29.726721900           ~ 7 0
49 2MASS J15081653-3434466 Y*? 15 08 16.5203768184 -34 34 46.814133036           ~ 3 0
50 UCAC4 321-077522 * 15 12 12.1965318840 -25 57 07.942275864   14.239 12.814 12.491   ~ 5 0
51 NAME Upper Centaurus Lupus MGr 15 24 -41.9           ~ 567 1
52 2MASS J15245632-2924478 * 15 24 56.3403236016 -29 24 47.967735600           ~ 3 0
53 2MASS J15310958-3504571 * 15 31 09.5940082680 -35 04 57.308645820           ~ 5 0
54 2MASS J15353890-3812394 Y*? 15 35 38.9044117920 -38 12 39.473319780           ~ 4 0
55 2MASS J15370178-3648509 Y*? 15 37 01.7817851280 -36 48 50.936372388           ~ 5 0
56 2MASS J15472336-3644109 Y*? 15 47 23.3615202456 -36 44 11.053397760           ~ 4 0
57 2MASS J15472448-3643363 Y*? 15 47 24.4824879336 -36 43 36.515420652           ~ 6 0
58 2MASS J15554765-3634001 Y*? 15 55 47.6468226648 -36 34 00.151859676           ~ 5 0
59 2MASS J16092855-3206172 Y*? 16 09 28.5506487120 -32 06 17.270760492           ~ 3 0
60 2MASS J16095486-3058581 Y*? 16 09 54.8643384648 -30 58 58.218055356           ~ 3 0
61 NAME Upper Sco Association As* 16 12 -23.4           ~ 1586 1
62 NAME Upper Sco-Cen As* 16 15 -24.2           ~ 1497 1
63 2MASS J16195395-3154057 NIR 16 19 53.954 -31 54 05.79           ~ 1 0
64 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 16269 0

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