2013A&A...555A.137D


Query : 2013A&A...555A.137D

2013A&A...555A.137D - Astronomy and Astrophysics, volume 555A, 137-137 (2013/7-1)

Substellar multiplicity in the Hyades cluster.

DUCHENE G., BOUVIER J., MORAUX E., BOUY H., KONOPACKY Q. and GHEZ A.M.

Abstract (from CDS):

We present the first high-angular resolution survey for multiple systems among very low-mass stars and brown dwarfs in the Hyades open cluster. Using the KeckII adaptive optics system, we observed a complete sample of 16 objects with estimated masses ≲0.1M. We have identified three close binaries with projected separation ≲0.11," or ≲5AU. A number of wide, mostly faint candidate companions are also detected in our images, most of which are revealed as unrelated background sources based on astrometric and/or photometric considerations. The derived multiplicity frequency, 19+13–6% over the 2-350AU range, and the rarity of systems wider than 10AU are both consistent with observations of field very low-mass objects. In the limited 3-50AU separation range, the companion frequency is essentially constant from brown dwarfs to solar-type stars in the Hyades cluster, which is also in line with our current knowledge for field stars. Combining the binaries discovered in this surveys with those already known in the Pleiades cluster reveals that very low-mass binaries in open clusters, as well as in star-forming regions, are skewed toward lower mass ratios (0.6≲q≲0.8) than are their field counterparts, a result that cannot be accounted for by selection effects. Although the possibility of severe systematic errors in model-based mass estimates for very low-mass stars cannot be completely excluded, it is unlikely to explain this difference. We speculate that this trend indicates that surveys among very low-mass field stars may have missed a substantial population of intermediate mass ratio systems, implying that these systems are more common and more diverse than previously thought.

Abstract Copyright:

Journal keyword(s): binaries: visual - brown dwarfs - stars: low-mass - open clusters and associations: individual: Hyades (Melotte 25)

CDS comments: Table 1 : UKIDSS Numerotation comes from Hogan et al. 2008MNRAS.388..495H Table 2.

Simbad objects: 33

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Number of rows : 33
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 LP 349-25 LM* 00 27 56.0057038615 +22 19 32.635434516   18.6   16.0   M8Ve 72 0
2 Cl Melotte 22 OpC 03 46 24.2 +24 06 50           ~ 3354 0
3 2MASS J03524627+2112332 BD* 03 52 46.27488 +21 12 33.2964           L1.5 7 0
4 2MASS J03554191+2257016 BD* 03 55 41.91504 +22 57 01.6776           L3V 19 0
5 2MASS J03584293+1039396 BD* 03 58 42.93408 +10 39 39.6936           L3.0 4 0
6 LP 414-50 PM* 04 04 27.01944 +20 24 30.5028   17.62 15.81 13.05 13.5 ~ 16 0
7 LP 414-1100 Er* 04 06 20.6306224920 +19 01 38.906704632   17.76 16.13     ~ 28 0
8 2MASS J04102390+1459104 BD* 04 10 23.9122101672 +14 59 10.346509824           L0.5 10 0
9 LP 414-1895 LM* 04 16 13.5366987720 +16 47 48.067652688   19.47 17.35     M4.75 12 0
10 LP 414-148 PM* 04 16 43.296 +16 49 20.33   17.69 15.90 13.68   ~ 24 0
11 Cl* Melotte 25 CFHT 19 LM* 04 17 24.7986704208 +16 34 36.324122988         17.49 M8 9 0
12 2MASS J04173384+1430156 BD* 04 17 33.84624 +14 30 15.6816           L1.0 6 0
13 Cl* Melotte 25 CFHT 13 LM? 04 19 05.7820117080 +17 34 23.295526068         14.52 ~ 8 0
14 2MASS J04202441+2356134 LM* 04 20 24.4362372288 +23 56 13.118558136       20.6 18.4 M8.5 8 0
15 LP 415-19 BD? 04 21 44.3704046400 +20 24 10.453768992           ~ 18 0
16 2MASS J04220512+1358474 LM* 04 22 05.1317334936 +13 58 47.303125212           M9.5 12 0
17 LP 415-35 PM* 04 23 12.4838685264 +15 42 46.368017496       15.70 12.87 ~ 31 0
18 LP 415-71 ** 04 25 47.021880 +17 32 40.58016   17.39 15.85 15.82   M5V 33 0
19 LP 415-875 LM* 04 26 21.7071758688 +18 00 01.027417104   17.69 15.89     M5V 34 0
20 Cl* Melotte 25 CFHT 21 BD* 04 29 22.82736 +15 35 29.9292         22.16 T1 5 0
21 Cl Melotte 25 OpC 04 29 47.3 +16 56 53           ~ 2992 0
22 Cl* Melotte 25 CFHT 20 BD* 04 30 38.77272 +13 09 56.9772         21.58 T2 9 0
23 LP 475-176 PM* 04 35 24.657408 +10 44 52.61928   17.93 15.97     ~ 11 0
24 2MASS J04354290+1323449 BD* 04 35 42.90264 +13 23 44.9916           L3.5 7 0
25 LP 415-1692 Er* 04 38 10.5554005464 +15 49 17.406776604   17.62 15.74     ~ 21 0
26 2MASS J04392907+1957351 LM* 04 39 29.07552 +19 57 35.1180           M3 3 0
27 NAME Taurus Complex SFR 04 41.0 +25 52           ~ 4248 0
28 2MASS J04421852+1754378 LM* 04 42 18.5323137936 +17 54 37.794602376           M9.5 6 0
29 2MASS J04463535+1451261 BD* 04 46 35.35200 +14 51 26.1864           L2.0 7 0
30 2MASS J04584566+1212343 BD* 04 58 45.6712228512 +12 12 34.302175884           L0.5 9 0
31 NAME Orion Nebula Cluster OpC 05 35.0 -05 29           ~ 2268 0
32 2MASS J12095613-1004008 BD* 12 09 56.13096 -10 04 00.8076           T2+T7.5 58 0
33 BD+16 2708B SB* 14 54 29.4185719182 +16 06 08.616294953           M8.5 136 0

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2023.09.23-06:27:33

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