2006A&A...460..799G


C.D.S. - SIMBAD4 rel 1.7 - 2021.04.12CEST02:23:36

2006A&A...460..799G - Astronomy and Astrophysics, volume 460, 799-810 (2006/12-4)

A search for substellar members in the Praesepe and σ Orionis clusters.

GONZALEZ-GARCIA B.M., ZAPATERO OSORIO M.R., BEJAR V.J.S., BIHAIN G., BARRADO Y NAVASCUES D., CABALLERO J.A. and MORALES-CALDERON M.

Abstract (from CDS):

We have conducted deep photometric searches for substellar members of the Praesepe (0.5-1Gyr) and σ Orionis (3Myr) star clusters using the Sloan i' and z' broad-band filters, with the 3.5-m and the 5-m Hale telescopes on the Calar Alto and Palomar Observatories. The total area surveyed was 1177arcmin2 and 1122arcmin2 towards the central regions of Praesepe and σ Orionis, respectively. The 5-σ detection limit of our survey is measured at i'=24.5 and z'=24mag, which according to state-of-the-art evolutionary models corresponds to masses of 50-55MJup (Praesepe) and 6MJup (σ Orionis), i.e., well within the substellar regime. Besides recovering previously known cluster members reported in the literature, we have identified new photometric candidates in both clusters whose masses expand the full range covered by our study. In σ Orionis, follow-up near-infrared photometry has allowed us to confirm the likely cluster membership of three newly discovered planetary-mass objects. The substellar mass function of σ Orionis, which is complete from the star-brown dwarf borderline down to 7MJup, rises smoothly with a slope of α=0.6+0.5–0.1 (dN/dM∼M–α). One of the faintest Praesepe candidates for which we have obtained follow-up near-infrared JHKs photometry closely fits the expected optical and infrared photometric sequence of the cluster. From its colors, we have estimated its spectral type to be between L4 and L6. If confirmed as a true Praesepe member, it would become the first L-type brown dwarf (50-60MJup) identified in an intermediate-age star cluster. Our derivation of the Praesepe mass function, which is based on state-of-the-art evolutionary models, depends strongly on the cluster age. For the youngest possible ages (500-700Myr), our results suggest that there is a deficit of Praesepe brown dwarfs in the central regions of the cluster, while the similarity between the Praesepe and σ Orionis mass functions increases qualitatively for models older than 800Myr.

Abstract Copyright:

Journal keyword(s): stars: late-type - stars: low-mass, brown dwarfs - stars: luminosity function, mass function - stars: pre-main sequence - open clusters and associations: individual: A|"CDS/simbad/smb.query.id "@827804" "Name=@827804" submit=submit null|σ Ori cluster">{σ Orionis} - open clusters and associations: individual: Praesepe

Nomenclature: Table 5: [GZB2006] Prae JHHMMSS.s+DDMMSS N=20. Table 6: [BMZ2001] S Ori JHHMMSS.s+DDMMSS N=18 added.

Simbad objects: 77

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Number of rows : 77

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 Cl Melotte 22 OpC 03 47 00 +24 07.0           ~ 3073 0
2 Cl Melotte 25 OpC 04 26 54.00 +15 52 00.0           ~ 2752 0
3 [BZR99] S Ori 19 * 05 37 21.0604504691 -02 25 40.042673605         16.62 ~ 6 0
4 Mayrit 1580310 * 05 37 24.4757705680 -02 18 56.518407057   23.92 20.71 19.06 17.19 ~ 4 0
5 UGCS J053731.89-021634.6 * 05 37 31.89 -02 16 34.6         19.63 ~ 2 0
6 [BMZ2001] S Ori J053732.3-022842 * 05 37 32.32 -02 28 42.1         23.09 ~ 1 0
7 2MASS J05373456-0255588 * 05 37 34.5706498559 -02 55 58.840322644   23.95   20.56 18.42 ~ 3 0
8 Mayrit 1436317 * 05 37 39.6584266808 -02 18 26.879145896   22.47   19.79 17.76 ~ 11 0
9 2MASS J05374248-0256358 Y*? 05 37 42.4807642911 -02 56 35.827169108   21.08 21.22 19.68 17.81 ~ 6 0
10 [BZR99] S Ori 23 Y*O 05 37 51.1104866700 -02 26 07.495213781   20.6   19.4 16.88 M6.5 14 0
11 [BZR99] S Ori 24 Y*O 05 37 55.7464920455 -02 24 33.700672939   23.05 20.54 18.89 17.04 M5.0 10 0
12 [BMZ2001] S Ori J053758.0-025146 * 05 37 57.98 -02 51 46.1         21.38 ~ 1 0
13 [BZR99] S Ori 44 * 05 38 07.126 -02 43 21.05   22.29 23.54 21.54 19.64 M7 7 0
14 Mayrit 1095334 Y*? 05 38 12.3978529890 -02 19 38.853119411   21.22   19.97 17.84 ~ 12 0
15 [BZR99] S Ori 67 BD* 05 38 12.61464 -02 21 36.7956         23.40 L5:e 9 0
16 [BZR99] S Ori 13 Y*O 05 38 13.2092361094 -02 24 07.550933226   21.07 19.68 18.06 16.13 M5.5 14 0
17 UGCS J053813.56-021934.6 * 05 38 13.56 -02 19 34.7         20.77 ~ 2 0
18 [BMZ2001] S Ori J053816.3-022727 * 05 38 16.38 -02 27 27.1         23.20 ~ 1 0
19 [BZR99] S Ori 53 LM* 05 38 25.11744 -02 48 02.7720         20.99 M9V 13 0
20 V* V2729 Ori Or* 05 38 25.57752 -02 48 37.0224   21.09 24.40 22.07 19.54 M8.5 31 0
21 NAME sigma Orionis Cluster MGr 05 38 42 -02 36.0           ~ 500 0
22 [BMZ2001] S Ori J053844.5-025512 Y*? 05 38 44.54 -02 55 14.3         22.77 ~ 5 0
23 * sig Ori Y*O 05 38 44.7665260139 -02 36 00.284709290 2.54 3.58 3.79 3.87 4.11 O9.5V 758 0
24 2MASS J05385492-0240337 Y*? 05 38 54.9250956239 -02 40 33.805810455     23.22 20.88 18.64 ~ 7 0
25 [BMZ2001] S Ori J053858.6-025228 BD* 05 38 58.55 -02 52 26.6         22.17 L2 7 0
26 2MASS J05390845-0239012 * 05 39 08.4464397947 -02 39 01.467389379         18.60 ~ 1 0
27 [BMZ2001] S Ori J053912.6-025724 * 05 39 12.60 -02 57 23.9         19.29 ~ 1 0
28 UGCS J053913.94-021621.8 * 05 39 13.95 -02 16 21.8         20.54 ~ 3 0
29 [BZR99] S Ori 38 Y*O 05 39 15.2626568055 -02 21 50.705185382   22.96   20.02 17.97 M7 13 0
30 [BMZ2001] S Ori J053918.1-025257 Y*? 05 39 18.1313272557 -02 52 56.504354682   21.56   21.03 18.89 ~ 7 0
31 [BMZ2001] S Ori J053919.2-025910 * 05 39 19.23 -02 59 10.4         22.50 ~ 1 0
32 [HHM2007] 1013 Y*O 05 39 22.2517713667 -02 45 52.454147942         17.15 ~ 10 0
33 [BZR99] S Ori 28 Y*? 05 39 23.1930476028 -02 46 55.769581456   22.63 21.06 19.41 17.23 M5.5 21 0
34 [BZR99] S Ori 42 Y*? 05 39 23.411 -02 40 57.55         19.18 M7.5 10 0
35 [BMZ2001] S Ori J053926.8-022614 * 05 39 26.7732966675 -02 26 14.323004373   21.76     18.26 ~ 9 0
36 [BMZ2001] S Ori J053929.4-024636 Y*? 05 39 29.37 -02 46 36.7         19.81 ~ 6 0
37 [BMZ2001] S Ori J053932.4-025220 Y*? 05 39 32.43 -02 52 20.2         22.87 ~ 5 0
38 [BZR99] S Ori 14 Y*O 05 39 37.5948022271 -02 44 30.501133772   22.39 20.39 18.69 16.71 ~ 15 0
39 [BZR99] S Ori 32 Y*? 05 39 43.5830871341 -02 47 31.811439136   21.35   19.75 17.59 M6.0 17 0
40 [BMZ2001] S Ori J053946.3-022631 * 05 39 46.33 -02 26 31.3         20.36 ~ 1 0
41 [BMZ2001] S Ori J053946.5-022423 Y*? 05 39 46.453 -02 24 23.06   21.84 23.60   19.74 ~ 7 0
42 [SE2004] 108 * 05 39 48.2654548848 -02 29 14.295949989   25.91   20.78 18.68 M7 12 0
43 [BMZ2001] S Ori J053956.8-025315 Y*? 05 39 56.83 -02 53 14.6         21.35 M8 8 0
44 UGCS J053957.39-025006.1 * 05 39 57.40 -02 50 06.2         22.10 ~ 3 0
45 [BMZ2001] S Ori J054007.8-022234 * 05 40 07.75 -02 22 34.3         22.56 ~ 2 0
46 [BMZ2001] S Ori J054008.5-024551 * 05 40 08.51 -02 45 50.6         22.80 ~ 4 0
47 UGCS J054009.31-022632.6 BD* 05 40 09.32 -02 26 32.6         20.55 L0 9 0
48 * zet Ori ** 05 40 45.52666 -01 56 33.2649 0.50 1.56 1.77 1.85 2.05 O9.7Ib+B0III 334 0
49 2MASS J08385059+1923164 PM* 08 38 50.5867550937 +19 23 16.388495916           ~ 2 0
50 [GZB2006] Prae J083904.7+194959 * 08 39 04.72 +19 49 58.6           ~ 1 0
51 [GZB2006] Prae J083905.4+192032 * 08 39 05.38 +19 20 31.5           ~ 1 0
52 [GZB2006] Prae J083910.2+195610 * 08 39 10.20 +19 56 10.1           ~ 1 0
53 NGC 2632 OpC 08 40 24 +19 40.0           ~ 1296 0
54 UGCS J084039.29+192839.5 * 08 40 39.29 +19 28 39.5           ~ 5 0
55 [GZB2006] Prae J084044.9+200025 * 08 40 44.975 +20 00 24.80           ~ 2 0
56 [GZB2006] Prae J084045.2+192532 * 08 40 45.24 +19 25 32.3           ~ 1 0
57 [GZB2006] Prae J084049.1+195913 * 08 40 49.194 +19 59 12.88           ~ 2 0
58 2MASS J08405122+1910106 * 08 40 51.2306427963 +19 10 10.599777370           ~ 1 0
59 [GZB2006] Prae J084052.5+190504 * 08 40 52.52 +19 05 03.5           ~ 1 0
60 Cl* NGC 2632 RP r1 * 08 40 54.6 +19 15 05         21.01 ~ 8 0
61 [GZB2006] Prae J084057.3+190258 * 08 40 57.37 +19 02 57.7           ~ 1 0
62 [GZB2006] Prae J084108.0+191401 * 08 41 08.00 +19 14 00.6           ~ 2 0
63 [GZB2006] Prae J084108.1+191111 * 08 41 08.13 +19 11 10.8           ~ 1 0
64 2MASS J08410852+1954018 BD? 08 41 08.5120245701 +19 54 01.769327675         19.63 ~ 8 0
65 [GZB2006] Prae J084111.2+191349 * 08 41 11.15 +19 13 49.1           ~ 1 0
66 [GZB2006] Prae J084111.9+192043 * 08 41 11.90 +19 20 43.3           ~ 1 0
67 [GZB2006] Prae J084114.5+191110 * 08 41 14.46 +19 11 10.1           ~ 1 0
68 [GZB2006] Prae J084115.8+191743 * 08 41 15.79 +19 17 43.0           ~ 1 0
69 [GZB2006] Prae J084122.6+192419 * 08 41 22.58 +19 24 19.0           ~ 1 0
70 Cl* NGC 2632 PHJ 20 * 08 41 24.8600368872 +19 57 26.987351862         18.48 M7V 9 0
71 [GZB2006] Prae J084126.5+195200 * 08 41 26.483 +19 51 59.73           ~ 2 0
72 [GZB2006] Prae J084130.4+190449 * 08 41 30.43 +19 04 48.5           ~ 2 0
73 Cl* NGC 2632 WFC 193 * ~ ~         18.21 ~ 1 0
74 Cl* NGC 2632 WFC 88 * ~ ~         19.83 ~ 1 0
75 Cl* NGC 2632 WFC 210 * ~ ~         18.02 ~ 1 0
76 Cl* NGC 2632 WFC 60 * ~ ~         20.79 ~ 1 0
77 Cl* NGC 2632 WFC 24 * ~ ~         21.19 ~ 1 0

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2021.04.12-02:23:36

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