2001ApJ...560..287L

Query : 2001ApJ...560..287L

2001ApJ...560..287L - Astrophys. J., 560, 287-306 (2001/October-2)

On the MBM 12 young association.

LUHMAN K.L.

Abstract (from CDS):

I present a comprehensive study of the MBM 12 young association (MBM 12A). By combining infrared (IR) photometry from the Two-Micron All-Sky Survey (2MASS) survey with new optical imaging and spectroscopy, I have performed a census of the MBM 12A membership that is complete to 0.03 M☉ (H∼15) for a 1°.75x1°.4 field encompassing the MBM 12 cloud. I find five new members with masses of 0.1-0.4 M☉ and a few additional candidates that have not been observed spectroscopically. From an analysis of optical and IR photometry for stars in the direction of MBM 12, I identify M dwarfs in the foreground and background of the cloud. By comparing the magnitudes of these stars to those of local field dwarfs, I arrive at a distance modulus 7.2±0.5 (275 pc) to the MBM 12 cloud; it is not the nearest molecular cloud and is not inside the local bubble of hot ionized gas as had been implied by previous distance estimates of 50-100 pc. I have also used Li strengths and H-R diagrams to constrain the absolute and relative ages of MBM 12A and other young populations; these data indicate ages of 2+3–1 Myr for MBM 12A and ∼10 Myr for the TW Hya and η Cha associations. MBM 12A may be a slightly evolved version of the aggregates of young stars within the Taurus dark clouds (∼1 Myr) near the age of the IC 348 cluster (∼2 Myr).

Abstract Copyright: ∼

Journal keyword(s): Infrared: Stars - Stars: Emission-Line, Be - Stars: Evolution - Stars: Formation - Stars: Low-Mass, Brown Dwarfs - Stars: Pre-Main-Sequence

Nomenclature: Table 1: [L2001] NN (Nos 1-12).

Simbad objects: 128

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Number of rows : 128
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 NAME Tuc Moving Group MGr 00 00 -64.0           ~ 71 0
2 NAME Horologium Association As* 02 10.0 -54 30           ~ 54 0
3 HD 14613 SB* 02 21 13.2580505088 -17 06 44.494829820   10.217 9.64 9.32   F7V 24 0
4 HD 14670 PM* 02 21 43.1973853728 -16 57 49.159554696   10.00 9.53     F6IV/V 16 0
5 2MASSs J0252368+193424 * 02 52 36.80 +19 34 24.2           M 1 0
6 2MASSs J0252486+203908 * 02 52 48.63 +20 39 08.6           M 1 0
7 2MASSs J0252490+195252 * 02 52 49.09 +19 52 52.4           M 1 0
8 2MASSs J0253030+194904 * 02 53 03.00 +19 49 04.3           M 1 0
9 LP 411-16 PM* 02 53 03.1113678696 +19 29 07.451683836   17.8   15.4   M5Ve 7 0
10 2MASSs J0253099+203849 * 02 53 09.92 +20 38 49.2           M 1 0
11 2MASSs J0253243+200659 * 02 53 24.37 +20 06 59.5           M 1 0
12 BD+18 370 * 02 53 46.8062046936 +18 38 03.041938176   9.53 9.07     A5 13 0
13 2MASSs J0253511+202808 * 02 53 51.15 +20 28 08.5           M 1 0
14 2MASSs J0253530+194517 * 02 53 53.09 +19 45 18.0           M 1 0
15 2MASSs J0254038+193136 * 02 54 03.87 +19 31 36.2           M 1 0
16 2MASSs J0254108+201804 * 02 54 10.90 +20 18 04.5           M 1 0
17 2MASSs J0254151+202218 * 02 54 15.13 +20 22 18.6           M 1 0
18 HD 18019 * 02 54 17.5563409944 +20 33 56.956780188 9.590 8.380 7.120     K0 18 0
19 GSC 01230-00880 * 02 54 47.1903897096 +20 29 18.532950000     12.9     M 2 0
20 HD 18066 * 02 54 49.8366900120 +20 22 23.038186044   8.23 6.98     K0 19 0
21 2MASSs J0255056+194454 * 02 55 05.61 +19 44 53.3           M 1 0
22 2MASS J02550833+1938594 PM* 02 55 08.3132112588 +19 38 59.178316668           M 1 0
23 GSC 01230-00688 * 02 55 11.9920834224 +20 16 24.474188388   15.93 14.12 13.66   G5III-IV 2 0
24 GSC 01227-00386 PM* 02 55 21.5210947848 +19 46 14.884740408     14.332     M0.5/1V 2 0
25 GSC 01227-00521 * 02 55 23.1111102024 +19 41 45.115338912     13.706     M 2 0
26 V* BS Ari TT* 02 55 25.8088286216 +20 04 51.398515764   13.50 12.20     K5.5 21 0
27 BD+18 375 PM* 02 55 32.3030562792 +18 46 25.669528351       9.3   K0 39 0
28 2MASSs J0255350+200648 * 02 55 35.02 +20 06 48.7           M 1 0
29 2MASSs J0255372+204311 * 02 55 37.26 +20 43 11.2           M 1 0
30 GSC 01230-00700 * 02 55 38.6399462136 +20 24 43.690101012     13.983     M 2 0
31 2MASSs J0255452+192526 * 02 55 45.24 +19 25 26.1           M 1 0
32 2MASSs J0255516+201807 * 02 55 51.65 +20 18 07.9           M 1 0
33 LDN 1457 DNe 02 55.9 +19 35           ~ 85 1
34 NAME MBM 12 Association As* 02 56.0 +19 32           ~ 18 0
35 LDN 1453 DNe 02 56.0 +20 17           ~ 25 0
36 2MASSs J0256007+194046 * 02 56 00.72 +19 40 46.1           M 1 0
37 V* BU Ari Or* 02 56 07.9958860128 +20 03 24.205352688   15.14 14.15 14.50   M1:IIIe 56 1
38 V* BV Ari Or* 02 56 08.424288 +20 03 38.57004   16.93 15.42 14.37   M3Ve 38 0
39 2MASSs J0256087+193344 * 02 56 08.78 +19 33 44.9           M 1 0
40 2MASSs J0256129+202915 * 02 56 12.94 +20 29 15.7           M 1 0
41 LAMOST J025617.98+200610.0 TT* 02 56 17.9839539096 +20 06 09.981012708           dM6 9 0
42 V* WY Ari Or* 02 56 37.5658451640 +20 05 37.249715436   13.29 12.46     K5/6e 84 0
43 HD 18283 * 02 56 46.0640423520 +21 25 41.156335560   9.12 8.78     A5 27 0
44 GSC 01227-01126 * 02 56 46.2475969872 +19 33 51.848946324     13.3     M 3 0
45 LDN 1454 DNe 02 56.8 +20 12           ~ 26 0
46 GSC 01227-00331 * 02 56 48.1427701368 +19 32 04.508591532     13.8     M 3 0
47 MBM 12 MoC 02 56 50 +19 32.0           ~ 224 1
48 GSC 01227-00831 * 02 56 57.4675217712 +19 58 15.659382828     14.197 13.77   G3V 2 0
49 2MASSs J0256598+200215 * 02 56 59.85 +20 02 15.7           M 1 0
50 GSC 01227-00508 * 02 57 00.4169962104 +19 51 24.652931328     13.240 12.82   G8III 3 0
51 GSC 01230-00681 * 02 57 03.8244302328 +20 13 11.180904348   15.66 13.90 13.56   K1.5III 2 0
52 2MASSs J0257159+202616 * 02 57 15.94 +20 26 16.7           M 1 0
53 GSC 01227-00224 * 02 57 21.4934388360 +19 47 30.621507684     12.4     M 3 0
54 GSC 01227-00904 * 02 57 28.0846813056 +19 57 38.276324856     13.519 12.92   G9III: 2 0
55 2MASSs J0257299+204308 * 02 57 29.94 +20 43 08.9           M 1 0
56 2MASSs J0257391+193107 * 02 57 39.11 +19 31 07.3           M 1 0
57 GSC 01227-00090 * 02 57 43.9236199104 +19 33 36.756727020     13.395     M 2 0
58 2MASSs J0257460+200055 * 02 57 46.05 +20 00 55.7           M 1 0
59 2MASSs J0257474+192609 * 02 57 47.43 +19 26 09.3           M 1 0
60 LDN 1458 DNe 02 57.8 +20 12           ~ 24 1
61 2MASS J02574903+2036076 TT* 02 57 49.0321087152 +20 36 07.633698120           M5.9 4 0
62 2MASSs J0257501+195830 * 02 57 50.17 +19 58 30.1           M 1 0
63 2MASSs J0257536+194325 * 02 57 53.60 +19 43 25.2           M 1 0
64 2MASSs J0257540+202724 * 02 57 54.09 +20 27 24.7           M 1 0
65 FBS 0255+193 * 02 57 56.3049930816 +19 32 28.969847268       13.40   M8/9 2 0
66 UCAC4 552-005655 PM* 02 57 58.5798417058 +20 22 08.069039111           M 1 0
67 2MASSs J0257597+200343 * 02 57 59.72 +20 03 43.5           M 1 0
68 2MASSs J0258046+193146 * 02 58 04.69 +19 31 46.9           M 1 0
69 * 47 Ari PM* 02 58 05.2213070040 +20 40 07.442238720   6.230   5.6   F0V(e) 187 0
70 2MASSs J0258110+192908 * 02 58 11.03 +19 29 08.0           M 1 0
71 V* BX Ari Or* 02 58 11.231808 +20 30 03.14712   13.01 11.84 11.99   K2.0 37 0
72 2MASS J02581337+2008248 TT* 02 58 13.3697247264 +20 08 24.692004780           M6e 4 0
73 LP 411-29 PM* 02 58 14.6401464000 +20 22 48.975926412   16.9   14.7   M3/3.5V 7 0
74 GSC 01227-00419 * 02 58 15.7233840312 +19 46 26.162932692     13.713 13.30   K0III 2 0
75 V* BY Ari Or* 02 58 16.0931391192 +19 47 19.347297972           M3.8 13 0
76 ATO J044.5879+20.5478 TT* 02 58 21.090000 +20 32 52.60632   17.662 16.130     M3e 10 0
77 GSC 01230-00903 PM* 02 58 22.8823704096 +20 07 22.233535860   15.79 14.37 14.13   K7/8V 2 0
78 BD+18 382 ** 02 58 23.7705662712 +19 13 45.433792236   9.39 8.79     G0III 26 0
79 2MASSs J0258257+200824 * 02 58 25.78 +20 08 24.9           M 1 0
80 2MASSs J0258343+200023 * 02 58 34.32 +20 00 23.6           M 1 0
81 LP 411-31 PM* 02 58 34.4931970659 +19 46 50.399478675   20.5   17.4   ~ 8 0
82 2MASS J02584379+1940381 TT* 02 58 43.7931077064 +19 40 38.081894736           M5.8 6 0
83 2MASSs J0258458+201114 * 02 58 45.81 +20 11 15.0           M 1 0
84 2MASSs J0258523+195840 * 02 58 52.39 +19 58 40.0           M 1 0
85 HD 18484 ** 02 58 53.07176 +21 37 03.8426           A3 95 0
86 HD 18485 * 02 58 54.5335672176 +19 34 33.820452588   9.41 8.31     K0 15 0
87 2MASSs J0259057+202309 * 02 59 05.71 +20 23 09.5           M 1 0
88 HD 18508 PM* 02 59 10.3970263656 +19 59 23.423080128 7.720 7.710 7.350     F0 47 0
89 * eps Ari B * 02 59 12.678278 +21 20 24.26202   5.61 5.57     A3IVs 77 0
90 * eps Ari ** 02 59 12.72536 +21 20 25.5575 4.75 4.67 4.63 4.58 4.56 A2IV+A3IVs 45 0
91 * eps Ari A * 02 59 12.7258032120 +21 20 25.538577396   5.21 5.16     A2IV 73 0
92 LP 411-33 PM* 02 59 12.9889846008 +20 05 49.485093252   17.1   14.4   M2.5/3V 5 0
93 GSC 01230-00873 * 02 59 13.4245925880 +20 34 52.578156288   13.81 12.36 12.13   M 2 0
94 [DB2002b] G161.59-35.89 MoC 02 59.4 +17 12           ~ 13 0
95 GSC 01230-00761 * 02 59 25.8312712752 +20 17 02.912345628   15.77 14.24 14.00   G 2 0
96 HD 18731 EB? 03 01 10.9519807584 +19 24 09.998539740   8.89 8.44     F5 24 0
97 2MASS J03022104+1710342 TT* 03 02 21.0374555016 +17 10 34.377967992     13.5     M2.6 20 0
98 RX J0306.5+1921 * 03 06 33.1 +19 21 52     11.4     K1 5 1
99 IC 348 OpC 03 44 31.7 +32 09 32           ~ 1393 1
100 Cl Melotte 22 OpC 03 46 24.2 +24 06 50           ~ 3435 0
101 NAME Taurus Complex SFR 04 41.0 +25 52           ~ 4416 0
102 NAME Ori Trapezium OpC 05 35 16.5 -05 23 14           ~ 1619 1
103 V* EG Cha Or* 08 36 56.2143359952 -78 56 45.633633000   11.82 10.457   9.010 K4Ve 98 0
104 HD 75505 * 08 41 44.7049093968 -79 02 53.258689068   7.55 7.38     A1V 52 0
105 V* EK Cha Or* 08 42 27.0967343784 -78 57 47.910415932   16.659 15.153 14.893   M4.5 74 0
106 NAME eta Cha Association OpC 08 42 32.9 -78 57 47           ~ 363 0
107 V* EM Cha Or* 08 43 07.2443828304 -79 04 52.483961064     10.8     K6.0 57 0
108 V* EO Cha Or* 08 44 31.8938144088 -78 46 31.143275076     12.531   10.646 M0e 74 0
109 V* EQ Cha TT* 08 47 56.7585043512 -78 54 53.185560516   14.777 13.308 12.802 10.795 M3 80 0
110 V* BX Ant TT* 10 18 28.6987521312 -31 50 02.830052544   13.39 11.454 11.382 9.325 M0Ve 119 0
111 IC 2602 OpC 10 42 27.1 -64 25 34           ~ 675 0
112 V* CE Ant TT* 10 42 30.1018928760 -33 40 16.229805204   12.21 10.91   9.10 M2Ve 209 1
113 V* TW Hya TT* 11 01 51.9053285064 -34 42 17.033218380   11.94 10.50 10.626 9.18 K6Ve 1892 1
114 NAME TW Hya Association As* 11 01.9 -34 42           ~ 942 0
115 CD-29 8887 TT* 11 09 13.7928873024 -30 01 39.968872752   12.95 11.119 10.642 8.875 M2Ve 128 0
116 TWA 3B TT* 11 10 27.8406509184 -37 31 52.748684904   14.59 13.70   8.86 M4Ve 56 0
117 TWA 3 ** 11 10 27.894072 -37 31 51.96612   13.53 12.05 11.61 9.29 M4Ve+M4Ve 211 0
118 TWA 3A TT* 11 10 27.9121410480 -37 31 51.535547940   14.04 12.57   9.10 M4Ve 209 0
119 HD 98800 TT* 11 22 05.28975 -24 46 39.7571   10.20 9.28 9.26 7.386 K5V(e) 375 0
120 CD-33 7795 TT* 11 31 55.2608963280 -34 36 27.203892120   12.97 11.524 11.150 9.150 M2Ve 190 0
121 CD-26 8623B TT* 11 32 41.1733260768 -26 52 09.107765976   16.70 15.22 13.68 11.76 M5.5 75 0
122 CD-26 8623 TT* 11 32 41.2658824800 -26 51 55.961893800   13.69 12.23 11.14 9.637 M3Ve 105 0
123 CD-36 7429B TT* 11 48 23.7348035520 -37 28 48.520414812   15.43 14.00   11.45 M1V 81 0
124 CD-36 7429A TT* 11 48 24.2227406904 -37 28 49.114270524   12.54 11.17 10.92 9.552 K5V 127 0
125 CD-36 7429 ** 11 48 24.22320 -37 28 49.1537           ~ 98 0
126 V* V1252 Cen TT* 12 35 04.2560376888 -41 36 38.616010560   14.39 13.045   10.506 M2Ve 80 0
127 HD 109573B Y*? 12 36 00.5491381248 -39 52 15.693558816         10.78 M2.5 84 0
128 HD 109573 PM* 12 36 01.0317461592 -39 52 10.220465388   5.786 5.774 7.25 5.81 A0V 634 1

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