2007ApJ...654..580S

Query : 2007ApJ...654..580S

2007ApJ...654..580S - Astrophys. J., 654, 580-594 (2007/January-1)

Spitzer 24 µm observations of open cluster IC 2391 and debris disk evolution of FGK stars.

SIEGLER N., MUZEROLLE J., YOUNG E.T., RIEKE G.H., MAMAJEK E.E., TRILLING D.E., GORLOVA N. and SU K.Y.L.

Abstract (from CDS):

We present 24 µm Spitzer MIPS photometric observations of the ∼50 Myr open cluster IC 2391. Thirty-four cluster members ranging in spectral type from B3 to M5 were observed in the central square degree of the cluster. Excesses indicative of debris disks were discovered around one A star, six FGK stars, and possibly one M dwarf. For the cluster members observed to their photospheric limit, we find a debris disk frequency of 10+17–3% for B-A stars and 31+13–9% for FGK stars using a 15% relative excess threshold. Relative to a model of decaying excess frequency, the frequency of debris disks around A-type stars appears marginally low for the cluster's age while that of FGK stars appears consistent. Scenarios that may qualitatively explain this result are examined. We conclude that planetesimal activity in the terrestrial region of FGK stars is common in the first ∼50 Myr and decays on timescales of ∼100 Myr. Despite luminosity differences, debris disk evolution does not appear to depend strongly on stellar mass.

Abstract Copyright: ∼

Journal keyword(s): Infrared: Stars - Galaxy: Open Clusters and Associations: Individual: Alphanumeric: IC 2391 - Stars: Planetary Systems: Protoplanetary Disks

Nomenclature: Table 1: Cl* IC 2391 SMY NN (Nos 1-34).

Simbad objects: 54

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Number of rows : 54
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 BD+20 307 SB* 01 54 50.3440413288 +21 18 22.461011784   9.57 9.01     G0 113 0
2 V* DK Cet PM* 01 57 48.9775849512 -21 54 05.341104000   8.73 8.057   7.343 G4V 152 0
3 Cl Melotte 22 OpC 03 46 38.0 +24 10 41           ~ 3679 0
4 Cl Melotte 25 OpC 04 30 27.4 +16 46 43           ~ 3309 0
5 V* V1005 Ori BY* 04 59 34.8342878424 +01 47 00.669818328   11.48 10.107 9.603 8.239 M0Ve 371 0
6 NGC 2244 OpC 06 32 06.9 +04 54 19           ~ 673 1
7 Cl* NGC 2422 PMS 1121 * 07 35 42.6918901416 -14 50 42.249024672 13.344 13.262 12.668 12.335 11.981 F9 20 0
8 NGC 2422 OpC 07 36 35.8 -14 30 15           ~ 275 0
9 NGC 2516 OpC 07 58 00.5 -60 46 36           ~ 793 0
10 Cl* NGC 2547 OJD 50 * 08 09 35.4834335520 -49 13 03.335454768   18.493 18.006 18.48 16.74 M4.4 19 0
11 NGC 2547 OpC 08 10 01.5 -49 12 08           ~ 445 0
12 HD 69830 PM* 08 18 23.9469682407 -12 37 55.817187530   6.74 5.95     G8:V 587 1
13 HD 73777 * 08 37 47.0462493600 -52 52 12.246748896   10.07 9.73 9.85   F5V 21 0
14 VXR PSPC 2a * 08 37 55.5737657592 -52 57 10.895343372   12.26 11.34 11.42   G9 12 0
15 HD 73952 * 08 38 44.8073176272 -53 05 25.373574564   6.348 6.431     B8V 82 0
16 CD-52 2472 SB* 08 38 55.6626968784 -52 57 51.679265796 11.19 11.01 10.33 10.19   G2 51 0
17 Cl* IC 2391 SMY 5 Y*? 08 38 58.7467263456 -53 19 12.647031996   15.224 13.777 13.363   M3 19 0
18 CD-52 2473 SB* 08 38 59.8085961096 -53 01 26.206476240 10.00 10.08 9.62     F5V 34 0
19 HD 74009B * 08 39 02.8163053896 -52 42 38.504779092     11.28 10.85   K: 14 0
20 HD 74009 * 08 39 03.3941906520 -52 42 39.709905264   9.51 9.37 9.48   F3V 33 0
21 V* HW Vel bC* 08 39 23.8445033904 -53 26 23.167592268 4.72 5.291 5.439     B5V 114 0
22 Cl* IC 2391 PP 7 * 08 39 29.5789052952 -53 21 04.419342396     17.21     M5 6 0
23 CD-52 2482 * 08 39 38.8131754176 -53 10 07.119992820   10.59 9.95     G: 27 0
24 HD 74117 * 08 39 43.0466316168 -52 57 51.259330764   9.46 9.10     F2IV/V 52 0
25 V* V364 Vel BY* 08 39 53.0493554064 -52 57 56.847553812   12.75 11.89 11.69   K0 49 0
26 HD 74146 SB* 08 39 57.5984976576 -53 03 17.016627132 4.48 5.05 5.19     B5IV 121 0
27 V* KR Vel a2* 08 39 59.3714205216 -53 15 39.452330772   7.183 7.200     ApEuCr(Sr) 97 0
28 HD 74145 * 08 40 01.6382364984 -52 42 12.545314308   8.74 8.47     A7/8III/IV(m) 73 0
29 V* V365 Vel BY* 08 40 06.2321644608 -53 38 06.875687760   11.07 10.47 10.44   G0 49 0
30 VXR PSPC 16a * 08 40 16.2484046424 -52 56 29.172145452   12.48 11.76 11.60   G9 40 0
31 HD 74196 * 08 40 17.4649643448 -53 00 55.430609904 4.97 5.47 5.61     B9/A0 144 0
32 * omi Vel Pu* 08 40 17.5993322082 -52 55 18.875623881 2.8 3.44 3.63     B3/5(V) 181 1
33 Cl* IC 2391 PMM 1759 V* 08 40 18.2860194816 -53 30 28.806321024   14.73 13.51 13.07   K3e 34 0
34 HD 74275 * 08 40 48.5254610328 -52 48 06.974980164   7.27 7.27     A0V 77 0
35 Cl* IC 2391 SMY 23 * 08 40 49.1007179088 -53 37 45.364323468   11.91 11.15 10.84   G6 47 0
36 HD 74340 SB* 08 41 09.9773642568 -52 54 10.540967328   10.33 9.87     F5V 51 0
37 IC 2391 OpC 08 41 17.5 -53 03 00           ~ 871 0
38 HD 74374 * 08 41 22.7413299456 -53 38 09.149175312   9.92 9.55 9.79   F3V 39 0
39 V* V366 Vel BY* 08 41 25.8875436000 -53 22 41.467632456   13.63 12.519   11.277 K3e 44 0
40 V* V367 Vel BY* 08 41 39.6670054632 -52 59 34.032238440   14.63 12.613     K7.5e 31 0
41 HD 74438 * 08 41 46.5805673472 -53 03 44.995790376   7.81 7.58     A2mA5-A8 55 0
42 V* V368 Vel BY* 08 41 57.8482531848 -52 52 13.942332264   14.59 13.76 12.74 12.03 K7e 41 0
43 HD 74517 * 08 42 07.9897725768 -53 09 35.046730224   8.73 8.63     A3V 27 0
44 HD 74516 * 08 42 09.9561714480 -52 58 03.652619016   7.40 7.38     A1V 80 0
45 CD-52 2501 * 08 42 12.2935097520 -53 06 03.797278668           F5V 41 0
46 V* V371 Vel BY* 08 42 18.5563649256 -53 01 56.872692444   15.44       M2e 37 0
47 V* KT Vel a2* 08 42 18.9916454899 -53 06 00.204770302 4.79 5.340 5.474     B9III(pSi) 110 0
48 HD 74560 SB* 08 42 25.3866034128 -53 06 50.343377699 3.97 4.655 4.815     B3IV 182 0
49 HD 74665 SB* 08 42 53.2433020680 -53 45 00.744878232   8.32 8.12     A3Vn 52 0
50 NAME Lower Centaurus Crux As* 12 19 -57.1           ~ 565 1
51 NAME Upper Centaurus Lupus MGr 15 24 -41.9           ~ 567 1
52 NAME Upper Sco-Cen As* 16 15 -24.2           ~ 1497 1
53 V* AK Sco Ae* 16 54 44.8491575376 -36 53 18.566586456 9.80 9.63 9.00     F5V 304 1
54 HD 197481 BY* 20 45 09.5324974119 -31 20 27.237889841   10.05 8.627 9.078 6.593 M1VeBa1 1344 0

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