2004MNRAS.351.1401J


Query : 2004MNRAS.351.1401J

2004MNRAS.351.1401J - Mon. Not. R. Astron. Soc., 351, 1401-1422 (2004/July-2)

Low mass stars, brown dwarf candidates and the mass function of the young open cluster NGC 2547.

JEFFRIES R.D., NAYLOR T., DEVEY C.R. and TOTTEN E.J.

Abstract (from CDS):

We present a catalogue of RcIcZ photometry over an area of 0.855 square degrees, centred on the young open cluster NGC 2547. The survey is substantially complete to limits of Rc= 21.5, Ic= 19.5, Z= 19.5. We use the catalogue to define a sample of NGC 2547 candidates with model-dependent masses of about 0.05 -1.0 M. After correcting for incompleteness and estimating contamination by foreground field dwarfs, we investigate the mass function of the cluster, its binary content, and search for evidence of mass segregation among the lower mass stars. There is ample evidence for mass segregation between high (>3 M) and lower mass stars, but over the range 0.1 < M < 0.7 M, the data are consistent with no further mass segregation. By fitting King profiles we conclude that at least 60 per cent of the low-mass stellar population are contained within our survey. The cluster mass function is remarkably similar to the Pleiades for 0.075 < M < 0.7 M. Because of its age (≃ 30 Myr), we demonstrate that this mass function is robust to a number of systematic uncertainties likely to affect older and younger clusters and is therefore one of the best available estimates for the initial mass function in young disc populations. For 0.05 < M < 0.075 Mthere is some evidence for a deficit of brown dwarfs in NGC 2547 compared with other clusters. This deficit may extend to lower masses or may only be a dip, perhaps caused by an imperfect understanding of the mass-magnitude relationship at temperatures of around 2800 K. Incompleteness in both our survey and the luminosity functions from which we estimate contamination by foreground objects leave this question open. The binary fraction for systems with mass ratios greater than about 0.5 is 20-35 per cent for M dwarfs in NGC 2547, quite consistent with that found in the field and other young clusters. The full photometric catalogue and our lists of candidate cluster members are made available in electronic format.

Abstract Copyright: 2004 RAS

Journal keyword(s): methods: data analysis - techniques: photometric - stars: formation - stars: pre-main-sequence - open clusters and associations: individual: NGC 2547

VizieR on-line data: <Available at CDS (J/MNRAS/351/1401): tablea1.dat>

Nomenclature: Tables A1: Cl* NGC 2547 JND FF-NNNN N=109470.

Status at CDS : All or part of tables of objects will not be ingested in SIMBAD.

Simbad objects: 9

goto Full paper

goto View the references in ADS

Number of rows : 9
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 Cl Melotte 20 OpC 03 26 28 +48 58.5           ~ 812 0
2 IC 348 OpC 03 44 32 +32 09.5           ~ 1327 1
3 Cl Melotte 22 OpC 03 46 24 +24 06.8           ~ 3260 0
4 NAME Orion Nebula Cluster OpC 05 35.0 -05 29           ~ 2192 1
5 NAME Ori Trapezium OpC 05 35 16.5 -05 23 14           ~ 1565 1
6 NAME sigma Orionis Cluster MGr 05 38 42 -02 36.0           ~ 532 0
7 NGC 2168 OpC 06 09 05 +24 20.2           ~ 519 0
8 NGC 2516 OpC 07 58 06 -60 48.0           ~ 661 0
9 NGC 2547 OpC 08 09 52.360 -49 10 35.01           ~ 371 0

To bookmark this query, right click on this link: simbad:objects in 2004MNRAS.351.1401J and select 'bookmark this link' or equivalent in the popup menu


2022.12.04-19:14:04

© Université de Strasbourg/CNRS

    • Contact