2012ApJ...758...77Z

Query : 2012ApJ...758...77Z

2012ApJ...758...77Z - Astrophys. J., 758, 77 (2012/October-3)

A 40 myr old gaseous circumstellar disk at 49 Ceti: massive CO-rich comet clouds at young a-type stars.

ZUCKERMAN B. and SONG I.

Abstract (from CDS):

The gaseous molecular disk that orbits the main-sequence A-type star 49 Ceti has been known since 1995, but the stellar age and the origin of the observed carbon monoxide molecules have been unknown. We now identify 49 Ceti as a member of the 40 Myr old Argus Association and present a colliding comet model to explain the high CO concentrations seen at 49 Ceti and the 30 Myr old A-type star HD 21997. The model suggests that massive–400 Earth mass–analogs of the Sun's Kuiper Belt are in orbit around some A-type stars, that these large masses are composed primarily of comet-like objects, and that these objects are rich in CO and perhaps also CO2. We identify additional early-type members of the Argus Association and the Tucana/Horologium and Columba Associations; some of these stars display excess mid-infrared emission as measured with the Widefield Infrared Survey Explorer.

Abstract Copyright: ∼

Journal keyword(s): circumstellar matter - comets: general - evolution - protoplanetary disks - stars: individual: 49 Ceti

Simbad objects: 57

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Number of rows : 57
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 THA MGr 00 00 -62.0           ~ 540 0
2 * bet03 Tuc ** 00 32 43.9053745704 -63 01 53.402028960 5.15 5.13 5.09     A0V 139 0
3 * 49 Cet PM* 01 34 37.7786780856 -15 40 34.898673000   5.667 5.607   5.54 A1V 348 0
4 HD 10638 PM* 01 44 22.8101731920 +32 30 57.159014724   6.96 6.73   6.45 A3 44 0
5 HD 15745 PM* 02 32 55.8109019904 +37 20 01.040152092   7.84 7.49   7.05 F0 83 0
6 * s Eri SB* 02 39 47.9753006640 -42 53 30.519103344   4.81 4.75     A1Vb 88 1
7 HD 20888 PM* 03 17 59.0748472584 -66 55 36.667301016   6.163 6.022     A3V 74 0
8 HD 21997 PM* 03 31 53.6470102728 -25 36 50.940001116   6.501 6.372   6.25 A3IV/V 174 0
9 Cl Melotte 22 OpC 03 46 38.0 +24 10 41           ~ 3679 0
10 NAME Tau-Aur Complex SFR 04 30 +25.0           ~ 1453 0
11 HD 30447 * 04 46 49.5286580976 -26 18 08.851615452   8.25 7.86   7.39 F3V 89 0
12 * ome Aur PM* 04 59 15.4093630440 +37 53 24.881188776   5.01 5.00     A1V 143 0
13 HD 32297 * 05 02 27.4358754192 +07 27 39.678553260   8.32 8.14     A0V 234 0
14 HD 32296 PM* 05 04 16.1898565800 +45 46 45.666524352   6.73 6.51     A2 26 0
15 HD 35505 * 05 24 28.4869999272 -16 58 32.795612400   5.631 5.636     A0V 52 0
16 HD 37286 * 05 36 10.2953769240 -28 42 28.848600612   6.409 6.256   6.10 A2III/IV 69 0
17 HD 37306 * 05 37 08.7722861928 -11 46 31.857428280   6.143 6.089     A1V 64 0
18 HD 38206 * 05 43 21.6709239120 -18 33 26.911637928   5.711 5.727   5.72 A0V 120 0
19 * zet Lep * 05 46 57.3413646658 -14 49 19.020570470   3.637 3.525     A2IV-V(n) 308 0
20 NAME Columba Association As* 06 04 19.4 -22 20 40           ~ 337 0
21 HD 45380 * 06 26 44.8518087216 -07 30 42.985244628   6.29 6.33     B9V 54 0
22 NAME AB Dor Moving Group MGr 06 38 53.4 -42 50 04           ~ 540 0
23 * 26 Gem PM* 06 42 24.3272435853 +17 38 43.086480602   5.27 5.21     A2V 97 0
24 HD 71043 * 08 22 55.1581878672 -52 07 25.424206824   5.900 5.887     A0V 73 0
25 HD 85672 * 09 53 59.1495199248 +27 41 43.644926832   7.75 7.58   7.41 A0 32 0
26 * q Vel PM* 10 14 44.1556880397 -42 07 18.988830783 3.98 3.90 3.85 3.83 3.81 A2Va 146 0
27 HD 90874 PM* 10 27 25.2837816936 -65 42 16.782780240   6.084 5.991     A2V 45 0
28 HD 95429 PM* 11 00 08.2775134272 -51 49 04.086654528   6.331 6.143     A3III/IV 36 0
29 V* TW Hya TT* 11 01 51.9053285064 -34 42 17.033218380   11.94 10.50 10.626 9.18 K6Ve 2144 1
30 HD 101615 PM* 11 41 19.7910777168 -43 05 44.397442968   5.57 5.53     A0V 62 0
31 * bet Leo dS* 11 49 03.57834 +14 34 19.4090 2.30 2.22 2.13 2.08 2.06 A3Va 605 1
32 * 3 Crv PM* 12 11 03.8390016096 -23 36 08.715836340   5.52 5.47     A1V 65 0
33 HD 107146 PM* 12 19 06.5018840304 +16 32 53.867731128   7.61   6.7   G2V 307 0
34 HD 109573 TT* 12 36 01.0317461592 -39 52 10.220465388   5.786 5.774   5.81 A0V 684 1
35 NAME NGP reg 12 51 26.275 +27 07 41.70           ~ 1274 0
36 CPD-68 1894 TT* 13 22 07.5421944624 -69 38 12.219391716   11.38 10.393   9.117 K1Ve 203 0
37 NAME beta Pic Moving Group MGr 14 30 -42.0           ~ 894 0
38 HD 130556 PM* 14 48 20.7372071568 +21 19 06.974783724   8.28 7.89     F0 31 0
39 HD 131835 * 14 56 54.4677661992 -35 41 43.658813184   8.05 7.86     A2IV 148 0
40 HD 138965 PM* 15 40 11.5557598920 -70 13 40.379510928   6.499 6.424     A1V 58 0
41 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 16269 0
42 HD 319139 SB* 18 14 10.4818675368 -32 47 34.516836060   11.47 10.68   9.11 K5+K7 423 0
43 * 108 Her SB* 18 20 56.9702350080 +29 51 32.123419848   5.84 5.60   5.37 kA3mA7+A9V 99 0
44 * alf Lyr dS* 18 36 56.33635 +38 47 01.2802 0.03 0.03 0.03 0.07 0.10 A0V 2787 1
45 HD 172555 PM* 18 45 26.9009806435 -64 52 16.534807985   4.967 4.767     A7V 321 0
46 * eta Tel PM* 19 22 51.2060774616 -54 25 26.145617376   5.035 5.020   4.99 A0V 228 0
47 * phi Aql SB* 19 56 14.2519125984 +11 25 25.401080424   5.283 5.278     A1IV 140 0
48 * eps Pav PM* 20 00 35.5515303087 -72 54 37.812955563   3.927 3.940     A0Va 142 0
49 HD 191089 SB? 20 09 05.2156358688 -26 13 26.520165768   7.62 7.18     F5V 177 0
50 * b03 Cyg dS* 20 14 32.0323540824 +36 48 22.700909124 5.10 5.11 4.99 4.79 4.72 A2V 284 0
51 * chi Cap PM* 21 08 33.6250217616 -21 11 37.214550420   5.320 5.316     A0Van 70 0
52 * alf PsA PM* 22 57 39.04625 -29 37 20.0533 1.31 1.25 1.16 1.11 1.09 A4V 1303 3
53 * kap Psc a2* 23 26 55.9558721856 +01 15 20.177913204 4.94 4.98 4.94 4.87 4.90 A2VpSrCrSi 290 0
54 HD 221853 PM* 23 35 36.1523996880 +08 22 57.426983076   7.75 7.34   6.88 F0 56 0
55 * del Scl PM* 23 48 55.5462353347 -28 07 48.976490953 4.55 4.58 4.57 4.53 4.55 A0VankB9((_lB)) 149 0
56 * eta Tuc ** 23 57 35.0786487048 -64 17 53.627347464   5.046 4.989     A1V 94 0
57 NAME Argus Association As* ~ ~           ~ 266 0

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