2011A&A...531A.164W


Query : 2011A&A...531A.164W

2011A&A...531A.164W - Astronomy and Astrophysics, volume 531A, 164-164 (2011/7-1)

The substellar mass function in the central region of the open cluster Praesepe from deep LBT observations.

WANG W., BOUDREAULT S., GOLDMAN B., HENNING Th., CABALLERO J.A. and BAILER-JONES C.A.L.

Abstract (from CDS):

Studies of the mass function (MF) of open clusters of different ages allow us to probe the efficiency with which brown dwarfs evaporate from clusters to populate the field. Surveys of older clusters (age>100Myr) are not affected so severely by several problems encountered in young clusters, such as intra-cluster extinction and large uncertainties in brown dwarf models. We present the results of a deep photometric survey to study the MF of the central region of the old open cluster Praesepe (age 590+150–120Myr, distance 190+6.0–5.8pc), down to the substellar regime. We performed an optical (riz and Y-band) photometric survey of Praesepe using the Large Binocular Telescope Camera covering an area of 0.59deg2 in the cluster centre from i∼19.0mag (∼100MJup) down to a 5σ detection limit at i∼25.6mag (∼40MJup). The survey is approximately 95% complete at i=23.8mag and z=22.0mag (∼55MJup). We identify 59 cluster member candidates, of which 37 are substellar, by comparing with the predictions of a dusty atmosphere model. The MF of those candidates rises from the substellar boundary until ∼67MJup and then declines. This is quite different from the form inferred for other open clusters older than 50Myr, but seems to be similar to those found in very young open clusters, the MFs of which peak at ∼10MJup. Either Praesepe really does have a different MF from other clusters or they had similar initial MFs but a different dynamical evolution. Since most of the candidates are faint, we lack astrometric or spectroscopic follow-ups to test their memberships. However, the contaminations by field dwarfs, galaxies, or giants are found to have little effect on the shape of MF and therefore the MF of ``real'' cluster members should have similar characteristics.

Abstract Copyright:

Journal keyword(s): brown dwarfs - stars: low-mass - stars: luminosity function, mass function - open clusters and associations: individual: Praesepe

Nomenclature: Table 3: [WBG2011] ANN (Nos A01-A17, B01-B09, C01-C13, D01-D21).

Simbad objects: 80

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Number of rows : 80
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 IC 348 OpC 03 44 34 +32 09.8           ~ 1259 1
2 Cl Melotte 22 OpC 03 47 00 +24 07.0           ~ 3103 0
3 Cl Melotte 25 OpC 04 26 54.00 +15 52 00.0           ~ 2775 0
4 NAME Taurus Complex SFR 04 41.0 +25 52           ~ 3742 0
5 NAME Orion Nebula Cluster OpC 05 35.0 -05 29           ~ 2067 1
6 NAME Trapezium Cluster As* 05 35 16.5 -05 23 14           ~ 1514 1
7 NAME sigma Orionis Cluster MGr 05 38 42 -02 36.0           ~ 505 0
8 NGC 2168 OpC 06 08 54 +24 20.0           ~ 483 0
9 [WBG2011] C01 LM* 08 38 34.501 +19 31 08.83           ~ 1 0
10 [WBG2011] B01 LM* 08 38 39.176 +19 42 54.85           ~ 1 0
11 [WBG2011] C02 LM* 08 38 48.106 +19 31 43.17           ~ 1 0
12 [WBG2011] C03 LM* 08 38 49.426 +19 16 43.34           ~ 1 0
13 [BBG2010] 914 BD? 08 38 52.0169050094 +19 35 05.163238909         19.12 ~ 2 0
14 [WBG2011] B02 LM* 08 38 59.208 +20 02 32.63           ~ 1 0
15 [WBG2011] C04 LM* 08 38 59.835 +19 31 52.00           ~ 1 0
16 [WBG2011] C05 LM* 08 39 00.756 +19 37 38.70           ~ 1 0
17 [WBG2011] C06 LM* 08 39 02.279 +19 37 38.47           ~ 1 0
18 [WBG2011] B03 LM* 08 39 06.931 +19 51 00.19           ~ 1 0
19 [WBG2011] C07 LM* 08 39 11.773 +19 36 35.63           ~ 1 0
20 [WBG2011] C08 LM* 08 39 22.309 +19 38 37.41           ~ 1 0
21 [BBG2010] 902 BD? 08 39 23.72 +19 52 01.8         20.15 ~ 2 0
22 [WBG2011] B04 LM* 08 39 28.285 +19 44 01.63           ~ 1 0
23 [WBG2011] B05 LM* 08 39 34.775 +19 43 06.65           ~ 1 0
24 [WBG2011] C09 LM* 08 39 35.180 +19 34 13.22           ~ 1 0
25 [WBG2011] C10 LM* 08 39 35.196 +19 33 50.49           ~ 1 0
26 [WBG2011] C11 LM* 08 39 36.737 +19 34 55.25           ~ 1 0
27 UGCS J083937.01+195229.7 LM* 08 39 37.01 +19 52 29.7           ~ 2 0
28 [WBG2011] B07 LM* 08 39 38.172 +20 01 17.52           ~ 1 0
29 2MASS J08393959+1947543 BD? 08 39 39.5773433412 +19 47 54.309692847         17.95 ~ 4 0
30 [BBG2010] 18 BD? 08 39 42.79 +19 35 48.2         18.27 ~ 2 0
31 2MASS J08394781+1928033 BD? 08 39 47.7991907211 +19 28 02.928078776         18.81 ~ 6 0
32 UGCS J083951.95+195042.0 LM* 08 39 51.96 +19 50 42.1           ~ 2 0
33 [WBG2011] C13 LM* 08 39 54.504 +19 20 09.00           ~ 1 0
34 [BBG2010] 9 BD? 08 39 55.84 +19 53 14.3         20.29 ~ 2 0
35 [WBG2011] B09 LM* 08 39 56.429 +19 47 31.41           ~ 1 0
36 2MASS J08395940+1943371 BD? 08 39 59.4425954814 +19 43 37.466156897         19.09 ~ 2 0
37 [BBG2010] 903 BD? 08 40 00.1833617012 +19 30 27.039912331         19.74 ~ 2 0
38 [WBG2011] D01 LM* 08 40 10.438 +19 24 07.42           ~ 1 0
39 [WBG2011] A01 LM* 08 40 12.599 +19 56 50.33           ~ 1 0
40 [WBG2011] D02 LM* 08 40 13.215 +19 27 00.51           ~ 1 0
41 [WBG2011] D03 LM* 08 40 13.829 +19 26 55.82           ~ 1 0
42 [WBG2011] A02 LM* 08 40 18.893 +19 57 07.40           ~ 1 0
43 [WBG2011] A03 LM* 08 40 20.624 +19 43 40.72           ~ 1 0
44 [WBG2011] D04 LM* 08 40 20.994 +19 38 46.21           ~ 1 0
45 [WBG2011] D05 LM* 08 40 21.561 +19 38 51.23           ~ 1 0
46 NGC 2632 OpC 08 40 24 +19 40.0           ~ 1316 0
47 [WBG2011] A04 LM* 08 40 24.901 +19 57 15.52           ~ 1 0
48 [WBG2011] A05 LM* 08 40 25.044 +19 41 44.56           ~ 1 0
49 [WBG2011] D06 LM* 08 40 25.698 +19 36 25.68           ~ 1 0
50 [WBG2011] A06 LM* 08 40 25.773 +19 57 08.28           ~ 1 0
51 [WBG2011] A07 LM* 08 40 25.981 +19 57 07.02           ~ 1 0
52 [WBG2011] D07 LM* 08 40 26.220 +19 37 54.58           ~ 1 0
53 [WBG2011] A08 LM* 08 40 27.459 +19 43 19.69           ~ 1 0
54 IC 2391 OpC 08 40 32 -53 02.0           ~ 741 0
55 [WBG2011] A09 LM* 08 40 32.282 +19 43 53.72           ~ 1 0
56 [WBG2011] A10 LM* 08 40 33.639 +19 53 08.76           ~ 1 0
57 [WBG2011] A11 LM* 08 40 35.313 +19 44 54.81           ~ 1 0
58 UGCS J084039.29+192839.5 * 08 40 39.29 +19 28 39.5           ~ 5 0
59 [WBG2011] D09 LM* 08 40 43.705 +19 29 52.89           ~ 1 0
60 [GZB2006] Prae J084044.9+200025 * 08 40 44.975 +20 00 24.80           ~ 2 0
61 [GZB2006] Prae J084049.1+195913 * 08 40 49.194 +19 59 12.88           ~ 2 0
62 [WBG2011] D10 LM* 08 40 50.371 +19 29 46.29           ~ 1 0
63 [WBG2011] D11 LM* 08 40 53.452 +19 19 13.98           ~ 1 0
64 2MASS J08405363+1940580 BD? 08 40 53.6120761484 +19 40 58.218724355         19.19 ~ 3 0
65 [WBG2011] D13 LM* 08 40 56.008 +19 25 31.85           ~ 1 0
66 [WBG2011] D14 LM* 08 41 00.974 +19 32 00.88           ~ 1 0
67 [WBG2011] D15 LM* 08 41 02.632 +19 22 13.66           ~ 1 0
68 [BBG2010] 22 BD? 08 41 04.2 +19 31 28         18.89 ~ 2 0
69 [WBG2011] D16 LM* 08 41 06.062 +19 27 47.71           ~ 1 0
70 [WBG2011] A14 LM* 08 41 08.239 +19 47 08.93           ~ 1 0
71 2MASS J08410852+1954018 BD? 08 41 08.5120245701 +19 54 01.769327675         19.63 M9 9 0
72 [WBG2011] A15 LM* 08 41 15.526 +19 44 11.43           ~ 1 0
73 [WBG2011] D18 LM* 08 41 15.768 +19 28 15.81           ~ 1 0
74 [WBG2011] D19 LM* 08 41 17.045 +19 28 13.46           ~ 1 0
75 Cl* NGC 2632 PHJ 20 * 08 41 24.8600368872 +19 57 26.987351862         18.48 M7V 9 0
76 [GZB2006] Prae J084126.5+195200 * 08 41 26.483 +19 51 59.73           ~ 2 0
77 [WBG2011] D20 LM* 08 41 32.924 +19 32 13.40           ~ 1 0
78 [WBG2011] D21 LM* 08 41 36.404 +19 25 06.45           ~ 1 0
79 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 3196 1
80 SH 2-106 HII 20 27 26.8 +37 22 49           ~ 416 2

    Equat.    Gal    SGal    Ecl

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2021.07.27-08:10:05

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