2006A&A...458..805B


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.04CEST22:04:50

2006A&A...458..805B - Astronomy and Astrophysics, volume 458, 805-816 (2006/11-2)

Pleiades low-mass brown dwarfs: the cluster L dwarf sequence.

BIHAIN G., REBOLO R., BEJAR V.J.S., CABALLERO J.A., BAILER-JONES C.A.L., MUNDT R., ACOSTA-PULIDO J.A. and MANCHADO TORRES A.

Abstract (from CDS):

We present a search for low-mass brown dwarfs in the Pleiades open cluster. The identification of Pleiades members fainter and cooler than those currently known allows us to constrain evolutionary models for L dwarfs and to extend the study of the cluster mass function to lower masses. We conducted a 1.8deg2 near-infrared J-band survey at the 3.5 m Calar Alto Telescope, with completeness Jcpl∼19.0. The detected sources were correlated with those of previously available optical I-band images (Icpl∼22). Using a J versus I-J colour-magnitude diagram, we identified 18 faint red L-type candidates, with magnitudes 17.4<J<19.7 and colours I-J>3.2. If Pleiades members, their masses would span ∼0.040-0.020M. We performed follow-up HKs-band imaging to further confirm their cluster membership by photometry and proper motion. Out of 11 IJ candidates with proper motion measurements, we find six cluster members, two non-members and three whose membership is uncertain and depends on the intrinsic velocity dispersion of Pleiades brown dwarfs. This dispersion (>4mas/yr) is at least four times that of cluster stars with masses >1M. Five of the seven other IJ candidates are discarded because their J-Ks colours are bluer than those of confirmed members. Our least massive proper motion members are BRB 28 and 29 (∼25MJup). The J versus I-J sequence of the L-type candidates at J>18 is not as red as theoretical models predict; it rather follows the field L-dwarf sequence translated to the cluster distance. This sequence overlapping, also observed in the J versus J-H and J-K diagrams, suggests that Pleiades and field L dwarfs may have similar spectral energy distributions and luminosities, and thus possibly similar radii. Also, we find α=0.5±0.2 for a power-law approximation dN/dM ∝M–α of the survey mass spectrum in the mass range 0.5-0.026M. This value is similar to that of much younger clusters, indicating no significant differential evaporation of low-mass Pleiades members relative to more massive ones.

Abstract Copyright:

Journal keyword(s): galaxies: clusters: individual: Pleiades - stars: low-mass, brown dwarfs - stars: luminosity function, mass function

Nomenclature: Table 1: Cl* Melotte 22 BRB NN (Nos 1-34).

Simbad objects: 50

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Number of rows : 50

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 * alf Per V* 03 24 19.3700924 +49 51 40.245455 2.64 2.27 1.79     F5Ib 796 2
2 Cl Melotte 20 OpC 03 26 42 +48 48.0           ~ 750 0
3 V* V1186 Tau BY* 03 42 26.8129153527 +24 50 20.601658998           ~ 10 0
4 Cl* Melotte 22 BRB 4 LM* 03 44 23.2338364262 +25 38 45.144093998         17.005 M6.5V 4 0
5 Cl* Melotte 22 PLIZ 1262 LM* 03 44 27.28298 +25 44 41.9744         22.235 ~ 5 0
6 Cl* Melotte 22 PLIZ 2141 LM* 03 44 31.27050 +25 35 15.0036         22.043 ~ 5 0
7 IC 348 OpC 03 44 34 +32 09.8           ~ 1227 1
8 Cl Melotte 22 OpC 03 47 00 +24 07.0           ~ 2978 0
9 Cl* Melotte 22 TEIDE 1 LM* 03 47 17.9128387886 +24 22 31.730547022         19.26 M8.0 104 0
10 Cl* Melotte 22 BPL 152 LM* 03 47 39.0097758088 +24 36 22.399100742       20.17 17.91 M6.0 25 0
11 Cl* Melotte 22 BRB 30 LM* 03 47 56.96 +24 28 58.4       24.46 22.48 ~ 1 0
12 Cl* Melotte 22 BRB 24 LM* 03 48 19.34827 +24 52 07.7431       24.96 22.01 ~ 1 0
13 Cl* Melotte 22 ROQUE 25 BD* 03 48 30.73544 +22 44 50.5385         21.80 L0.1 20 0
14 Cl* Melotte 22 BRB 16 LM* 03 48 31.51964 +24 34 37.5632         20.00 M9.0 14 0
15 Cl* Melotte 22 CFHT 5 LM* 03 48 44.6886016343 +24 37 23.626828418         17.02 M5.5 19 0
16 Cl* Melotte 22 BRB 34 LM* 03 48 46.39115 +24 45 00.9178         23.01 ~ 1 0
17 Cl* Melotte 22 NPL 40 LM* 03 48 49.04436 +24 20 25.6827         20.55 M9.8 13 0
18 Cl* Melotte 22 BRB 26 LM* 03 48 56.17 +25 09 43.1       24.00 22.07 ~ 1 0
19 Cl* Melotte 22 BRB 32 LM* 03 49 01.64261 +24 41 40.5704         22.72 ~ 1 0
20 Cl* Melotte 22 BRB 10 LM* 03 49 15.1201896432 +24 36 22.647176268         17.71 M6.5 24 0
21 Cl* Melotte 22 BRB 23 BD* 03 50 39.53807 +25 02 54.9480       24.16 22.03 L3.5 5 0
22 Cl* Melotte 22 CALAR 1 PM* 03 51 03.8012385255 +23 51 00.400627408           M9 6 0
23 Cl* Melotte 22 PLIZ 12 LM* 03 51 25.5664173006 +23 45 21.481457318         19.00 M8.0 63 0
24 Cl* Melotte 22 BRB 31 LM* 03 51 25.93 +24 15 32.2       25.55 23.05 ~ 1 0
25 Cl* Melotte 22 BRB 1 LM* 03 51 51.5442334820 +23 34 49.372667345         16.10 M4.9 20 0
26 Cl* Melotte 22 BRB 8 LM* 03 52 05.8181104116 +24 17 31.210660893       19.32 17.34 M5.6 14 0
27 Cl* Melotte 22 PLIZ 3 LM* 03 52 06.7057393991 +24 16 00.698620526         18.02 M6.0 25 0
28 Cl* Melotte 22 CFHT 6 LM* 03 52 07.8717421444 +23 59 13.771464860           ~ 8 0
29 Cl* Melotte 22 PLIZ 35 BD* 03 52 39.14137 +24 46 29.7814         21.293 L2.0 7 0
30 Cl* Melotte 22 BRB 2 LM* 03 52 44.2856543708 +23 54 15.156837938       18.57 16.61 M4.9 13 0
31 Cl* Melotte 22 PLIZ 25 LM* 03 52 44.30 +24 24 50.0           ~ 4 0
32 Cl* Melotte 22 BRB 5 LM* 03 52 51.7869209625 +23 33 48.284437963       18.600 16.60 ~ 15 0
33 Cl* Melotte 22 BRB 28 LM* 03 52 54.89956 +24 37 18.5139       25.00 22.36 ~ 4 0
34 Cl* Melotte 22 BRB 25 LM* 03 52 59.69981 +23 51 55.6712         22.24 ~ 1 0
35 Cl* Melotte 22 BRB 6 LM* 03 53 09.6299803561 +23 33 47.970355679       18.77 16.50 ~ 12 0
36 Cl* Melotte 22 BPL 283 LM* 03 53 23.1543247884 +23 19 20.151684588         18.34 M8 17 0
37 Cl* Melotte 22 PLIZ 6 LM* 03 53 55.1152628020 +23 23 36.302170350         17.752 M8.0 22 0
38 Cl* Melotte 22 BRB 29 BD* 03 54 01.41365 +23 49 57.7846         22.84 L4.5 4 0
39 Cl* Melotte 22 PLIZ 20 LM* 03 54 05.32560 +23 33 59.7708         19.571 M9.0 15 0
40 Cl* Melotte 22 BRB 17 BD* 03 54 07.96153 +23 54 27.8464         20.92 L0.0 3 0
41 Cl* Melotte 22 BRB 21 BD* 03 54 10.27245 +23 41 40.3586       24.02 21.68 L3.0 6 0
42 Cl* Melotte 22 PLIZ 28 BD* 03 54 14.05703 +23 17 52.2063         20.760 L0.0 8 0
43 Cl* Melotte 22 BRB 13 LM* 03 55 12.5852499252 +23 17 37.643877448         18.62 M7.0 14 0
44 Cl Collinder 69 OpC 05 35 06 +09 56.0     2.8     ~ 227 0
45 * lam Ori ** 05 35 08.27761 +09 56 02.9611 2.45 3.48 3.66 3.72 3.89 O8IIIf+B0.5V 264 0
46 NAME sigma Orionis Cluster MGr 05 38 42 -02 36.0           ~ 486 0
47 * sig Ori Y*O 05 38 44.7665260139 -02 36 00.284709290 2.54 3.58 3.79 3.87 4.11 O9.5V 738 0
48 NGC 2632 OpC 08 40 24 +19 40.0           ~ 1224 0
49 2MASS J11101001+0116130 BD* 11 10 10.01064 +01 16 13.0872           T5.5 62 0
50 IC 4665 OpC 17 46 18 +05 43.0           ~ 312 0

    Equat.    Gal    SGal    Ecl

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2020.07.04-22:04:51

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