2012ApJ...757..163S


C.D.S. - SIMBAD4 rel 1.7 - 2020.10.29CET22:05:34

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 - 2020
#notes
1 * bet Pic PM* 05 47 17.0876901 -51 03 59.441135 4.13 4.03 3.86 3.74 3.58 A6V 1669 1
2 * bet Pic b Pl 05 47 17.0876901 -51 03 59.441135           ~ 354 1
3 V* AP Col Er* 06 04 52.1487274682 -34 33 35.772083870     12.96 11.49 9.60 M5 58 0
4 Ross 619 PM* 08 11 57.5595749358 +08 46 22.983154927   14.60 12.834 12.527   M4.5Ve 167 0
5 * eta Cha * 08 41 19.5144242735 -78 57 48.102318990 5.02 5.351 5.453     B8V 214 0
6 NAME eta Cha Association MGr 08 42 06 -79 01.6           ~ 312 0
7 TWA 34 LM* 10 28 45.7990825931 -28 30 37.527196674       15.82   M5e 24 0
8 NAME TW Hya Association As* 11 01.9 -34 42           ~ 829 0
9 TWA 28 LM* 11 02 09.8372483500 -34 30 35.573128437     21.46 19.14 17.90 M8.3 63 0
10 TWA 3B TT* 11 10 27.8410112470 -37 31 52.748874445   14.59 13.70   8.86 M4Ve 49 0
11 TWA 3 ** 11 10 27.894072 -37 31 51.96612   13.53 12.05 11.61 9.29 M4Ve+M4Ve 200 0
12 TWA 3A TT* 11 10 27.9117558304 -37 31 51.529219753   14.04 12.57   9.10 M4Ve 187 0
13 CD-33 7795B LM* 11 31 55.2500 -34 36 25.200     20.40   15.8 M8.5/9e 118 0
14 CD-33 7795 TT* 11 31 55.2603055856 -34 36 27.214242128   12.97 11.524 11.150 9.150 M2Ve 176 0
15 TWA 30B LM* 11 32 18.2184758367 -30 18 31.652412622         16.68 M4 33 0
16 TWA 30 Y*O 11 32 18.3109439046 -30 19 51.860228754   15.82 14.20 14.44 11.30 M5V 55 0
17 TWA 33 PM* 11 39 33.8249188234 -30 40 00.366404047   16.71 15.06 14.85   M5.5e 20 0
18 TWA 26 LM* 11 39 51.1435262748 -31 59 21.473337261         15.83 M8e 97 0
19 * eps Cha ** 11 59 37.57634 -78 13 18.6179           B9V(n) 95 0
20 TWA 31 PM* 12 07 10.8878369580 -32 30 53.757769890   18.5   16.4   M4.2 22 0
21 TWA 27 LM* 12 07 33.4676156527 -39 32 54.016042897     19.95 17.99 15.88 M8IVe 311 0
22 NAME Lower Centaurus Crux As* 12 19 -57.1           ~ 361 1
23 TWA 32 ** 12 26 51.366576 -33 16 12.54324   17.21 16.00 15.73   M6.3 26 0
24 TWA 29 LM* 12 45 14.1609543807 -44 29 07.737190128         18.0 M9.5p 42 0
25 2MASS J13373839-4736297 * 13 37 38.3988750645 -47 36 29.718467753           ~ 6 0
26 NAME Proxima Centauri Er* 14 29 42.9451234609 -62 40 46.170818907 14.21 12.95 11.13 9.45 7.41 M5.5Ve 989 0
27 NAME beta Pic Moving Group MGr 14 30 -42.0           ~ 575 0
28 * eta Tel B LM* 19 22 51.26 -54 25 30.7           M7.5V 65 0
29 V* AU Mic BY* 20 45 09.5323695486 -31 20 27.241710746   10.05 8.627 9.078 6.593 M1VeBa1 906 0

    Equat.    Gal    SGal    Ecl

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2020.10.29-22:05:34

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