Spitzer Observations of NGC 2547: The Disk Population at 25 Million Years

Author(s)

E. T. Young, C. J. Lada, P. Teixeira, J. Muzerolle, A. Muench, J. Stauffer, C. A. Beichman, G. H. Rieke, D. C. Hines, K. Y. L. Su, C. W. Engelbracht, K. D. Gordon, K. Misselt, J. Morrison, J. Stansberry, D. Kelly

Abstract

We present Spitzer observations of the young cluster NGC 2547, obtaining

photometry at 3.6, 4.5, 5.8, 8.0, and 24 μm, reaching significantly

fainter infrared sensitivities than previous studies. With these

observations, we investigate the disk frequency in this cluster. A total

of 3770, 2408, 1988, 1238, and 1123 sources were detected in the common

region of the five respective bands. The detection limits were 14.9,

14.0, 13.5, 13.3, and 12.0 mag, respectively. The large majority of

sources are associated with 2MASS objects. From this large ensemble, we

utilize the criteria of Naylor et al. to identify 184 likely members of

the cluster. The analyses in this paper are focused on these likely

members. Of the 184 candidates, 162 were detected in at least one

Infrared Array Camera (IRAC) band. These objects form a well-defined

family in the J-K,K-[3.6] color-color diagram. There is no evidence for

excess emission at 3.6 μm for cluster candidates with J-K

Organisation(s)

Department of Astrophysics

External organisation(s)

University of Arizona, California Institute of Technology (Caltech), Harvard-Smithsonian Center for Astrophysics

Journal

The Astrophysical Journal Supplement Series

Volume

154

Pages

428-432

ISSN

0067-0049

DOI

https://doi.org/10.1086/422688

Publication date

09-2004

Peer reviewed

Yes

Keywords

Portal url

https://ucrisportal.univie.ac.at/en/publications/7daca253-0d83-4e5f-81bd-379a8ae5b698