University of Surrey

Test tubes in the lab Research in the ATI Dance Research

A MAD view of Trumpler 14

Sana, H, Momany, Y, Gieles, M, Carraro, G, Beletsky, Y, Ivanov, VD, Silva, GD and James, G (2010) A MAD view of Trumpler 14 Astronomy and Astrophysics.

Full text not available from this repository.

Abstract

We present adaptive optics (AO) near-infrared observations of the core of the Tr 14 cluster in the Carina region obtained with the ESO multi-conjugate AO demonstrator, MAD. Our campaign yields AO-corrected observations with an image quality of about 0.2 arcsec across the 2 arcmin field of view, which is the widest AO mosaic ever obtained. We detected almost 2000 sources spanning a dynamic range of 10 mag. The pre-main sequence (PMS) locus in the colour-magnitude diagram is well reproduced by Palla & Stahler isochrones with an age of 3 to 5 1E+05 yr, confirming the very young age of the cluster. We derive a very high (deprojected) central density n0~4.5(+/-0.5) \times 10^4 pc^-3 and estimate the total mass of the cluster to be about ~4.3^{+3.3}_{-1.5} \times 10^3 Msun, although contamination of the field of view might have a significant impact on the derived mass. We show that the pairing process is largely dominated by chance alignment so that physical pairs are difficult to disentangle from spurious ones based on our single epoch observation. Yet, we identify 150 likely bound pairs, 30% of these with a separation smaller than 0.5 arcsec (~1300AU). We further show that at the 2-sigma level massive stars have more companions than lower-mass stars and that those companions are respectively brighter on average, thus more massive. Finally, we find some hints of mass segregation for stars heavier than about 10 Msun. If confirmed, the observed degree of mass segregation could be explained by dynamical evolution, despite the young age of the cluster.

Item Type: Article
Authors :
NameEmailORCID
Sana, HUNSPECIFIEDUNSPECIFIED
Momany, YUNSPECIFIEDUNSPECIFIED
Gieles, Mm.gieles@surrey.ac.ukUNSPECIFIED
Carraro, GUNSPECIFIEDUNSPECIFIED
Beletsky, YUNSPECIFIEDUNSPECIFIED
Ivanov, VDUNSPECIFIEDUNSPECIFIED
Silva, GDUNSPECIFIEDUNSPECIFIED
James, GUNSPECIFIEDUNSPECIFIED
Date : 10 March 2010
Identification Number : https://doi.org/10.1051/0004-6361/200913688
Related URLs :
Depositing User : Symplectic Elements
Date Deposited : 17 May 2017 12:40
Last Modified : 17 May 2017 15:05
URI: http://epubs.surrey.ac.uk/id/eprint/836272

Actions (login required)

View Item View Item

Downloads

Downloads per month over past year


Information about this web site

© The University of Surrey, Guildford, Surrey, GU2 7XH, United Kingdom.
+44 (0)1483 300800