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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 607208.0, MPI für Astronomie / Publikationen_mpia
Disk evolution in OB associations: deep Spitzer/IRAC observations of IC 1795
Authors:Roccatagliata, V.; Bouwman, J.; Henning, T.; Gennaro, M.; Feigelson, E.; Kim, J. S.; Sicilia-Aguilar, A.; Lawson, W. A.
Date of Publication (YYYY-MM-DD):2011
Journal Abbrev.:The Astrophysical Journal
Issue / Number:2
Audience:Not Specified
Abstract / Description:We present a deep Spitzer/Infrared Array Camera (IRAC) survey of the OB association IC 1795 carried out to investigate the evolution of protoplanetary disks in regions of massive star formation. Combining Spitzer/IRAC data with Chandra/Advanced CCD Imaging Spectrometer observations, we find 289 cluster members. An additional 340 sources with an infrared excess, but without X-ray counterpart, are classified as cluster member candidates. Both surveys are complete down to stellar masses of about 1 M sun. We present pre-main-sequence isochrones computed for the first time in the Spitzer/IRAC colors. The age of the cluster, determined via the location of the Class III sources in the [3.6]-[4.5]/[3.6] color-magnitude diagram, is in the range of 3-5 Myr. As theoretically expected, we do not find any systematic variation in the spatial distribution of disks within 0.6 pc of either O-type star in the association. However, the disk fraction in IC 1795 does depend on the stellar mass: sources with masses >2 M sun have a disk fraction of ~20%, while lower mass objects (2-0.8 M sun) have a disk fraction of ~50%. This implies that disks around massive stars have a shorter dissipation timescale.
Free Keywords:ISM: individual objects: W3; open clusters and associations: individual: W3 IC1795; protoplanetary disks; stars: formation; stars: pre-main sequence; X-rays: stars
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
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