2012ApJ...757..163S


Query : 2012ApJ...757..163S

2012ApJ...757..163S - Astrophys. J., 757, 163 (2012/October-1)

Identifying nearby, young, late-type stars by means of their circumstellar disks.

SCHNEIDER A., SONG I., MELIS C., ZUCKERMAN B. and BESSELL M.

Abstract (from CDS):

It has recently been shown that a significant fraction of late-type members of nearby, very young associations (age ≲ 10 Myr) display excess emission at mid-IR wavelengths indicative of dusty circumstellar disks. We demonstrate that the detection of mid-IR excess emission can be utilized to identify new nearby, young, late-type stars including two definite new members ("TWA 33" and "TWA 34") of the TW Hydrae Association (TWA). Both new TWA members display mid-IR excess emission in the Wide-field Infrared Survey Explorer catalog and they show proper motion and youthful spectroscopic characteristics–namely, Hα emission, strong lithium absorption, and low surface gravity features consistent with known TWA members. We also detect mid-IR excess–the first unambiguous evidence of a dusty circumstellar disk–around a previously identified UV-bright, young, accreting star (2M1337) that is a likely member of the Lower-Centaurus Crux region of the Scorpius-Centaurus Complex.

Abstract Copyright:

Journal keyword(s): brown dwarfs - circumstellar matter - open clusters and associations: individual: TW Hydrae Association - stars: evolution - stars: low-mass - stars: pre-main sequence

Nomenclature: TWA NN (Nos 33-34) added.

Simbad objects: 29

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Number of rows : 29
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 * bet Pic PM* 05 47 17.0876901 -51 03 59.441135 4.13 4.03 3.86 3.74 3.58 A6V 1905 1
2 * bet Pic b Pl 05 47 17.0876901 -51 03 59.441135           ~ 511 1
3 V* AP Col Er* 06 04 52.1486600471 -34 33 35.774443549     12.96 11.49 9.60 M5 74 0
4 Ross 619 PM* 08 11 57.5691729379 +08 46 22.952885566   14.60 12.834 12.527   M4.5V 201 0
5 * eta Cha Pu* 08 41 19.5125857944 -78 57 48.105898056 5.02 5.351 5.453     B8V 232 0
6 NAME eta Cha Association OpC 08 42 32.9 -78 57 47           ~ 363 0
7 TWA 34 LM* 10 28 45.7992409512 -28 30 37.525747356       15.82   M5e 35 0
8 NAME TW Hya Association As* 11 01.9 -34 42           ~ 942 0
9 TWA 28 LM* 11 02 09.8378779824 -34 30 35.562199176     21.46 19.14 17.90 M8.3 70 0
10 TWA 3B TT* 11 10 27.8406509184 -37 31 52.748684904   14.59 13.70   8.86 M4Ve 56 0
11 TWA 3 ** 11 10 27.894072 -37 31 51.96612   13.53 12.05 11.61 9.29 M4Ve+M4Ve 211 0
12 TWA 3A TT* 11 10 27.9121410480 -37 31 51.535547940   14.04 12.57   9.10 M4Ve 209 0
13 CD-33 7795B LM* 11 31 55.2500 -34 36 25.200     20.40   15.8 M8.5/9e 124 0
14 CD-33 7795 TT* 11 31 55.2608963280 -34 36 27.203892120   12.97 11.524 11.150 9.150 M2Ve 190 0
15 TWA 30B LM* 11 32 18.2189779176 -30 18 31.643286444         16.68 M4 40 0
16 TWA 30 Y*O 11 32 18.3115839696 -30 19 51.857770620       14.205 11.30 M5V 70 0
17 TWA 33 Y*? 11 39 33.8249537040 -30 40 00.365859300   16.71 15.06 14.85   M5.5e 33 0
18 TWA 26 LM* 11 39 51.1378374696 -31 59 21.443660124         15.83 M8e 108 0
19 * eps Cha EB* 11 59 37.57634 -78 13 18.6179           B9V(n) 106 0
20 TWA 31 PM* 12 07 10.8883274664 -32 30 53.755860744   18.5   16.4   M4.2 26 0
21 TWA 27 LM* 12 07 33.4675524840 -39 32 54.016625184     19.95 17.99 15.88 M8IVe 338 0
22 NAME Lower Centaurus Crux As* 12 19 -57.1           ~ 477 1
23 TWA 32 ** 12 26 51.366576 -33 16 12.54324   17.21 16.00 15.73   M6.3 32 0
24 TWA 29 LM* 12 45 14.1607780560 -44 29 07.728263340         18.0 M9.5p 48 0
25 2MASS J13373839-4736297 * 13 37 38.3988543864 -47 36 29.715851232           ~ 9 0
26 NAME Proxima Centauri Er* 14 29 42.9461331854 -62 40 46.164680672 14.21 12.95 11.13 9.45 7.41 M5.5Ve 1299 0
27 NAME beta Pic Moving Group MGr 14 30 -42.0           ~ 774 0
28 * eta Tel B LM* 19 22 51.3580284238 -54 25 31.569876496           M7.5V 72 0
29 HD 197481 BY* 20 45 09.5324974119 -31 20 27.237889841   10.05 8.627 9.078 6.593 M1VeBa1 1153 0

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