2010A&A...510A..27B


Query : 2010A&A...510A..27B

2010A&A...510A..27B - Astronomy and Astrophysics, volume 510, A27-27 (2010/2-1)

Brown dwarfs and very low mass stars in the Praesepe open cluster: a dynamically unevolved mass function?

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

Abstract (from CDS):

Determination of the mass functions of open clusters of different ages allows us to infer the efficiency with which brown dwarfs are evaporated from clusters to populate the field. In this paper we present the results of a photometric survey to identify low mass and brown dwarf members of the old open cluster Praesepe (age 590+150–120Myr, distance 190+6.0–5.8pc) from which we estimate its mass function and compare this with that of other clusters. We performed an optical (Ic-band) and near-infrared (J and Ks-band) photometric survey of Praesepe covering 3.1deg2. With 5σ detection limits of Ic=23.4 and J=20.0, our survey is predicted to be sensitive to objects with masses from 0.6 to 0.05M. We photometrically identify 123 cluster member candidates based on dust-free atmospheric models and 27 candidates based on dusty atmospheric models. The mass function rises from 0.6M down to 0.1M (a power law fit of the mass function gives α=1.8 ±0.1; ξ(M)∝M–α), and then turns over at ∼0.1M. This rise agrees with the mass function inferred by previous studies, including a survey based on proper motion and photometry. In contrast, the mass function differs significantly from that measured for the Hyades, an open cluster with a similar age (τ∼600Myr). Possible reasons are that the clusters did not have the same initial mass function, or that dynamical evolution (e.g. evaporation of low mass members) has proceeded differently in the two clusters. Although different binary fractions could cause the observed (i.e. system) mass functions to differ, there is no evidence for differing binary fractions from measurements published in the literature. Of our cluster candidates, six have masses predicted to be equal to or below the stellar/substellar boundary at 0.072M.

Abstract Copyright:

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

VizieR on-line data: <Available at CDS (J/A+A/510/A27): table3.dat>

Nomenclature: Table 3: [BBG2010] NNN (Nos 1-124), [BBG2010] 9NN (Nos 901-927).

Simbad objects: 161

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Number of rows : 161
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 8 O'Clock Arc blu 00 22 40.77984 +14 31 13.9548           ~ 65 0
2 Cl Melotte 22 OpC 03 46 24.2 +24 06 50           ~ 3431 0
3 Cl Melotte 25 OpC 04 29 47.3 +16 56 53           ~ 3071 0
4 NAME Orion Nebula Cluster OpC 05 35.0 -05 29           ~ 2329 0
5 NAME sig Ori Cluster OpC 05 38 42 -02 36.0           ~ 567 0
6 Cl* NGC 2632 JS 141 ** 08 36 39.47280 +20 22 33.9600   20.49 17.78   14.62 M3.7 15 0
7 2MASS J08364491+1859136 BD? 08 36 44.9190976224 +18 59 13.557080400         14.85 ~ 1 0
8 2MASS J08364501+2008459 Er* 08 36 45.0172372776 +20 08 45.810130632         15.77 M4.2 26 0
9 2MASS J08365500+1903130 ** 08 36 55.002 +19 03 13.09         14.62 ~ 1 0
10 2MASS J08365563+1936151 LM* 08 36 55.6368067704 +19 36 15.161121612         17.99 M8V 4 0
11 2MASS J08365989+2024234 Er* 08 36 59.8918905536 +20 24 23.451373077         12.90 K7.7 26 0
12 Cl* NGC 2632 PHJ 2 LM* 08 37 02.1534244608 +19 52 07.378753296         17.15 M7V 12 0
13 2MASS J08371143+2013459 Er* 08 37 11.4330553152 +20 13 45.900687108         17.01 M7V 13 0
14 Cl* NGC 2632 HSHJ 158 Er* 08 37 24.4989102792 +19 47 11.983600032         15.46 M3.6 26 0
15 2MASS J08373473+2027300 BD? 08 37 34.7421016728 +20 27 30.065262804         15.03 ~ 1 0
16 2MASS J08373490+2001295 BD? 08 37 34.9091561472 +20 01 29.187809652         15.06 ~ 1 0
17 2MASS J08374428+1940582 BD? 08 37 44.2985104536 +19 40 58.302903036         16.05 ~ 1 0
18 [BBG2010] 71 LM* 08 37 48.0332413344 +20 14 48.563786436         18.39 ~ 4 0
19 SDSS J083755.82+185348.9 BD? 08 37 55.82520 +18 53 48.9552         20.97 ~ 1 0
20 2MASS J08380242+1939583 BD? 08 38 02.4212061504 +19 39 58.310285472         16.40 ~ 1 0
21 2MASS J08380530+1946209 G 08 38 05.30688 +19 46 20.9352         17.74 ~ 1 0
22 2MASS J08380586+2007221 BD? 08 38 05.8691873472 +20 07 22.129271472         16.19 ~ 6 0
23 Cl* NGC 2632 HSHJ 195 Er* 08 38 08.0120684616 +20 03 50.568175116         15.54 M3.5 26 0
24 UCAC4 553-044448 LM* 08 38 08.1794754467 +20 26 46.137339658         13.93 M1.3 25 0
25 UGCS J083811.15+190145.7 G 08 38 11.16096 +19 01 45.7068         19.52 ~ 1 0
26 Cl* NGC 2632 PHJ 4 PM* 08 38 11.8393738944 +19 59 43.870369596         17.89 ~ 3 0
27 2MASS J08381244+2008026 * 08 38 12.4599654432 +20 08 02.539746888         16.15 M4.1 13 0
28 Cl* NGC 2632 JC 121 BD? 08 38 14.2257115398 +19 47 23.448939233       14.215 12.49 ~ 18 0
29 2MASS J08381695+2019549 BD? 08 38 16.9304644512 +20 19 55.265521872         19.28 ~ 1 0
30 2MASS J08382139+2026531 BD? 08 38 21.3928087649 +20 26 53.201466796   17.26 15.29   13.21 ~ 18 0
31 2MASS J08382186+2005356 Er* 08 38 21.8749142376 +20 05 35.766714336         16.25 M4.6 20 0
32 UGCS J083822.22+195909.2 G 08 38 22.22616 +19 59 08.8080         20.62 ~ 1 0
33 2MASS J08382272+1943550 G 08 38 22.7343767376 +19 43 54.764545224         17.17 ~ 1 0
34 SDSS J083824.44+202847.5 G 08 38 24.44 +20 28 47.6         17.93 ~ 2 0
35 2MASS J08382956+1945118 G 08 38 29.56416 +19 45 11.8296         17.61 ~ 3 0
36 2MASS J08383028+2009358 PM* 08 38 30.2743457088 +20 09 35.725569264         13.96 M3 2 0
37 Cl* NGC 2632 HSHJ 215 * 08 38 39.2911120176 +19 41 40.044500520         15.89 M4.5 13 0
38 2MASS J08384287+1903384 BD? 08 38 42.8630084112 +19 03 38.553341472         16.71 ~ 9 0
39 2MASS J08384955+2019401 BD? 08 38 49.5573371568 +20 19 40.039015476         16.98 ~ 2 0
40 SDSS J083851.77+190021.5 BD? 08 38 51.7756250016 +19 00 21.372891768         20.28 ~ 1 0
41 [BBG2010] 914 BD? 08 38 52.0142704032 +19 35 05.160294240         19.12 ~ 2 0
42 2MASS J08385206+2026272 BD? 08 38 52.0698266592 +20 26 27.503431584         17.91 ~ 1 0
43 [BBG2010] 913 BD? 08 38 52.2383410320 +20 09 18.799005960         19.15 ~ 1 0
44 Cl* NGC 2632 HSHJ 233 * 08 38 54.2003425320 +19 51 44.516518236         16.49 M4.3 21 0
45 Cl* NGC 2632 JS 255 Er* 08 38 55.1690943144 +20 13 08.861387916   20.40 17.60   14.46 M4V 27 0
46 Cl* NGC 2632 HSHJ 235 Er* 08 38 55.4744785152 +19 50 33.309423960         15.61 M3.6 28 0
47 Cl* NGC 2632 HSHJ 246 Er* 08 39 03.0850118640 +19 24 15.695154900         15.54 M3.9 22 0
48 [BBG2010] 918 BD? 08 39 05.4974767752 +19 05 13.304711544         19.53 ~ 1 0
49 2MASS J08390695+1947080 * 08 39 06.9572357952 +19 47 08.055436200         16.51 M4.8 19 0
50 2MASS J08390793+1856136 PM* 08 39 07.9304720616 +18 56 13.681670316         14.64 M3.5e 3 0
51 2MASS J08390876+2022579 BD? 08 39 08.7634325736 +20 22 57.973062000         15.54 ~ 1 0
52 2MASS J08391157+1856188 PM* 08 39 11.5650606264 +18 56 18.829476168         13.71 ~ 1 0
53 Cl* NGC 2632 WRS 4 Er* 08 39 12.7225425240 +19 30 16.863423624         16.89 M6.3 20 0
54 V* AY Cnc Er* 08 39 14.5290916920 +20 01 19.148197300   17.21 15.87 15.40 13.45 M1.2 32 0
55 2MASS J08392244+2004548 * 08 39 22.4431169044 +20 04 54.756319196         14.40 M1.9 26 0
56 SDSS J083923.71+195201.7 BD? 08 39 23.71728 +19 52 01.7040         20.15 ~ 2 0
57 2MASS J08392443+1925365 BD? 08 39 24.4425697032 +19 25 36.651267660         18.04 ~ 1 0
58 2MASS J08392556+1900022 BD? 08 39 25.5536800656 +19 00 02.621936916         18.79 ~ 1 0
59 [BBG2010] 916 BD? 08 39 29.3327185128 +19 16 42.799238904         19.10 ~ 1 0
60 UGCS J083929.94+201140.2 G 08 39 29.93616 +20 11 40.1496         20.11 ~ 1 0
61 2MASS J08393743+2000250 BD? 08 39 37.4326056768 +20 00 25.042373100         16.08 ~ 1 0
62 2MASS J08393959+1947543 BD? 08 39 39.5786672448 +19 47 54.317641128         17.95 ~ 5 0
63 UGCS J083942.79+193548.2 G 08 39 42.77672 +19 35 48.1742         18.27 ~ 4 0
64 2MASS J08394339+1948458 BD? 08 39 43.3875720072 +19 48 45.770876928         16.89 ~ 1 0
65 2MASS J08394781+1928033 BD? 08 39 47.7978721725 +19 28 02.922583667         18.81 ~ 6 0
66 UGCS J083951.67+193510.1 G 08 39 51.67104 +19 35 10.0788         19.48 ~ 1 0
67 2MASS J08395328+2007099 BD? 08 39 53.2823360784 +20 07 09.837559344         17.12 ~ 1 0
68 Cl* NGC 2632 HSHJ 291 Er* 08 39 54.4075529616 +19 27 37.180481760         15.52 M3.8 28 0
69 UGCS J083955.84+195314.4 G 08 39 55.79555 +19 53 14.7938         20.29 ~ 2 0
70 2MASS J08395840+2011586 PM* 08 39 58.4051028648 +20 11 58.576445124         16.67 ~ 1 0
71 2MASS J08395940+1943371 BD? 08 39 59.4422391648 +19 43 37.463588832         19.09 ~ 2 0
72 [BBG2010] 908 BD? 08 39 59.8740578664 +20 20 37.928239872         19.04 ~ 1 0
73 PSO J130.0007+19.5075 BD? 08 40 00.1894708968 +19 30 27.055712196         19.74 ~ 2 0
74 [BBG2010] 919 BD? 08 40 02.1472692744 +19 03 55.587921408         19.22 ~ 1 0
75 SDSS J084006.23+190146.0 BD? 08 40 06.2340192533 +19 01 46.031431915         19.07 ~ 1 0
76 2MASS J08401025+2023130 * 08 40 10.2434963323 +20 23 12.971599927         18.03 ~ 5 0
77 2MASS J08401060+2020505 LM* 08 40 10.6049441544 +20 20 50.478173880         16.95 M6V 19 0
78 2MASS J08401076+1940498 BD? 08 40 10.7629468536 +19 40 49.901356524         16.97 ~ 4 0
79 Cl* NGC 2632 JS 344 Er* 08 40 10.8501653064 +18 58 56.951925168   19.15 16.72   13.90 M3.2 26 0
80 NGC 2632 OpC 08 40 13.0 +19 37 16           ~ 1563 0
81 2MASS J08401640+2014002 LM* 08 40 16.37256 +20 13 59.7468         18.65 M9 3 0
82 UGCS J084028.16+185724.9 G 08 40 28.11984 +18 57 24.6996         18.88 ~ 1 0
83 [BBG2010] 910 BD? 08 40 34.0041659352 +20 14 56.161507164         20.08 ~ 1 0
84 UGCS J084039.29+192839.5 * 08 40 39.29 +19 28 39.5           ~ 5 0
85 2MASS J08405363+1940580 BD? 08 40 53.6119871304 +19 40 58.250549856         19.19 ~ 4 0
86 Cl* NGC 2632 HSHJ 333 * 08 40 53.9758481064 +20 05 24.393889860         14.80 M2.4 27 0
87 2MASS J08405492+1929384 G 08 40 54.9255111552 +19 29 38.457934548         17.49 ~ 4 0
88 [BBG2010] 911 BD? 08 40 56.4545324520 +20 14 59.401184568         19.64 ~ 1 0
89 2MASS J08405826+1926524 BD? 08 40 58.2671527416 +19 26 52.574333244         16.83 ~ 7 0
90 2MASS J08405953+2002502 G 08 40 59.5506252360 +20 02 50.431868952         17.00 ~ 1 0
91 2MASS J08405987+2001568 G 08 40 59.9087417208 +20 01 56.969384448         17.47 ~ 1 0
92 2MASS J08410163+1952024 BD? 08 41 01.6395032376 +19 52 02.404725420         16.67 ~ 1 0
93 SDSS J084104.15+193127.5 BD? 08 41 04.15176 +19 31 27.5268         18.89 ~ 2 0
94 UGCS J084104.52+201458.1 G 08 41 04.52736 +20 14 57.8940         21.61 ~ 1 0
95 Cl* NGC 2632 PHJ 18 LM* 08 41 08.5106184744 +19 54 01.764761112         19.63 M9 10 0
96 2MASS J08410889+1943272 ** 08 41 08.89248 +19 43 27.2748         16.14 ~ 1 0
97 IC 2391 OpC 08 41 10.1 -52 59 28           ~ 822 0
98 2MASS J08411093+1938042 BD? 08 41 10.9337329464 +19 38 04.579387512         18.05 ~ 1 0
99 Cl* NGC 2632 JS 411 LM* 08 41 11.0656306440 +20 22 38.489999052   17.78 15.82   13.73 M1.3 24 0
100 2MASS J08411167+1928518 BD? 08 41 11.6699545512 +19 28 51.947549724         18.20 ~ 1 0
101 2MASS J08411217+1952484 BD? 08 41 12.1756887048 +19 52 48.524654064         18.43 ~ 1 0
102 UGCS J084112.39+202800.1 G 08 41 12.3911466336 +20 28 00.070751928         19.15 ~ 1 0
103 2MASS J08411308+2007008 BD? 08 41 13.0844211408 +20 07 00.670244664   16.24 14.7   13.06 ~ 4 0
104 UGCS J084113.48+185905.3 G 08 41 13.4813283384 +18 59 05.257032180         21.06 ~ 1 0
105 2MASS J08411457+2018289 BD? 08 41 14.5819368912 +20 18 28.864835064         16.81 ~ 1 0
106 SDSS J084118.62+195644.0 mul 08 41 18.61 +19 56 44.3         19.02 ~ 1 0
107 Cl* NGC 2632 HSHJ 364 Er* 08 41 20.3403567768 +18 57 42.856396488         15.18 M3.4 27 0
108 [GZB2006] Prae J084130.4+190449 * 08 41 30.43 +19 04 48.5           ~ 2 0
109 2MASS J08413425+1925255 BD? 08 41 34.2471760176 +19 25 25.489010316         16.97 ~ 2 0
110 UGCS J084135.50+194000.4 G 08 41 35.51322 +19 40 00.3884         18.41 ~ 1 0
111 2MASS J08413847+1919498 G 08 41 38.4605796096 +19 19 49.822409532         17.37 ~ 1 0
112 [BBG2010] 926 BD? 08 41 44.8950664560 +19 28 53.099815152         18.99 ~ 1 0
113 [BBG2010] 923 BD? 08 41 45.0520780776 +18 58 56.313343848         19.21 ~ 1 0
114 SDSS J084145.15+191807.7 BD? 08 41 45.15816 +19 18 07.7688         21.30 ~ 1 0
115 2MASS J08414725+2009139 LM* 08 41 47.0385064944 +20 09 11.989381284         19.22 M1V 3 0
116 2MASS J08414773+1948377 LM* 08 41 47.73072 +19 48 37.7208         19.72 M8 2 0
117 2MASS J08414843+2010025 BD? 08 41 48.4333224888 +20 10 02.477726508         16.19 ~ 1 0
118 2MASS J08420117+1906285 G 08 42 01.1820330432 +19 06 28.376232660         16.75 ~ 2 0
119 2MASS J08420770+2006195 BD? 08 42 07.7018505144 +20 06 19.552323672         16.55 ~ 1 0
120 2MASS J08420932+1855490 BD? 08 42 09.3215978640 +18 55 49.101740544         17.32 ~ 8 0
121 [BBG2010] 927 BD? 08 42 09.3274815384 +19 40 20.568815004         18.89 ~ 1 0
122 [BBG2010] 922 BD? 08 42 10.6880704800 +19 21 44.430179724         19.23 ~ 1 0
123 2MASS J08421149+1952499 BD? 08 42 11.4951120144 +19 52 50.293589052         17.83 ~ 4 0
124 Cl* NGC 2632 JS 476 Er* 08 42 15.4962686808 +19 48 57.631303764   19.54 17.20   14.53 M2.7 27 0
125 2MASS J08421572+1945194 G 08 42 15.7278765553 +19 45 19.348162011         17.79 ~ 1 0
126 Cl* NGC 2632 HSHJ 417 Er* 08 42 19.2344813688 +19 02 14.771662421         14.60 M2.6 27 0
127 2MASS J08421966+1905037 BD? 08 42 19.6688349240 +19 05 03.567438492         17.44 ~ 1 0
128 2MASS J08422138+1903123 BD? 08 42 21.3957918912 +19 03 12.470570460         18.42 ~ 1 0
129 2MASS J08422296+2007241 BD? 08 42 22.9596798739 +20 07 24.082317504         15.32 ~ 1 0
130 [BBG2010] 921 BD? 08 42 24.8002744344 +19 06 14.824638612         18.97 ~ 1 0
131 2MASS J08422626+1956494 BD? 08 42 26.2609328544 +19 56 49.326699660         18.05 ~ 1 0
132 2MASS J08422634+1938245 G 08 42 26.3490231024 +19 38 24.532169316         16.95 ~ 2 0
133 2MASS J08422717+1944346 BD? 08 42 27.2248916928 +19 44 35.071787616         18.04 ~ 1 0
134 SDSS J084241.73+201127.5 BD? 08 42 41.7364540562 +20 11 27.722015136         19.01 ~ 1 0
135 2MASS J08424470+1919341 * 08 42 44.7113679384 +19 19 34.034533104         14.50 M2 2 0
136 2MASS J08425052+2020039 * 08 42 50.5202091792 +20 20 03.889036104         16.33 M4.4 18 0
137 2MASS J08425197+1905173 BD? 08 42 51.9681317424 +19 05 17.072094084         18.02 ~ 1 0
138 2MASS J08425197+2005194 BD? 08 42 51.9723137280 +20 05 19.430132244         16.20 ~ 3 0
139 2MASS J08425225+2008306 G 08 42 52.2567259728 +20 08 30.545911428         17.27 ~ 1 0
140 Cl* NGC 2632 JS 506 Er* 08 42 52.2852377208 +19 51 45.902243412   19.48 16.99   14.05 M2.5 26 0
141 2MASS J08425461+2003361 BD? 08 42 54.6042687408 +20 03 36.421282764         18.62 ~ 2 0
142 Cl* NGC 2632 PHJ 23 * 08 42 54.69 +20 03 35.8           ~ 3 0
143 SDSS J084300.72+193736.6 BD? 08 43 00.7284849097 +19 37 36.778903861         17.50 ~ 1 0
144 SDSS J084301.23+195000.0 BD? 08 43 01.23360 +19 50 00.0420         19.89 ~ 1 0
145 Cl* NGC 2632 PHJ 24 * 08 43 01.30 +19 49 59.6           ~ 3 0
146 2MASS J08430186+1954046 Er* 08 43 01.8701129952 +19 54 04.557041748         16.16 M4.5 22 0
147 2MASS J08430351+1902450 BD? 08 43 03.5167960936 +19 02 45.028070148         15.41 ~ 1 0
148 Cl* NGC 2632 JS 513 * 08 43 05.2870445344 +19 27 54.618148377   16.81 15.11   13.20 K7.9 28 0
149 Cl* NGC 2632 JS 521 Er* 08 43 08.3944244760 +19 28 06.115913724   20.07 17.57   14.31 M5V 28 0
150 2MASS J08430905+1943119 * 08 43 09.0667660800 +19 43 11.899014276         17.06 M5.8 6 0
151 2MASS J08431076+2001291 BD? 08 43 10.7669056416 +20 01 29.297388900         17.17 ~ 2 0
152 Cl* NGC 2632 HSHJ 445 Er* 08 43 12.6577126920 +19 34 28.986784896         15.39 M3.7 24 0
153 2MASS J08431576+2028326 BD? 08 43 15.7717415112 +20 28 32.744753868         15.79 ~ 2 0
154 2MASS J08431593+2020145 BD? 08 43 15.9441859872 +20 20 14.546059440         15.87 ~ 1 0
155 2MASS J08431705+2024406 BD? 08 43 17.0600802696 +20 24 40.680287316         16.95 ~ 3 0
156 2MASS J08432345+2017384 BD? 08 43 23.4239680224 +20 17 38.446070964         19.00 ~ 2 0
157 2MASS J08432676+1956465 BD? 08 43 26.7361852632 +19 56 46.269066984         18.92 ~ 1 0
158 SDSS J084327.03+200020.6 BD? 08 43 27.03480 +20 00 20.6856         19.54 ~ 1 0
159 2MASS J08432915+2009000 BD? 08 43 29.1594896256 +20 09 00.007939188         15.48 ~ 2 0
160 2MASS J08433226+2029126 BD? 08 43 32.2739319648 +20 29 12.796440612         17.32 ~ 1 0
161 * alf Lyr dS* 18 36 56.33635 +38 47 01.2802 0.03 0.03 0.03 0.07 0.10 A0Va 2686 1

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