University of Massachusetts Amherst ScholarWorks@UMass Amherst Astronomy Department Faculty Publication Series Astronomy 2009 Spitzer Observations of the Lambda Orionis cluster I: the frequency of young debris disks at 5 Myr Jesus Hernandez Nuria Calvet L. Hartmann J. Muzerolle R. Gutermuth University of Massachusetts - Amherst See next page for additional authors Follow this and additional works at: https://scholarworks.umass.edu/astro_faculty_pubs Part of the Astrophysics and Astronomy Commons Recommended Citation Hernandez, Jesus; Calvet, Nuria; Hartmann, L.; Muzerolle, J.; Gutermuth, R.; and Stauffer, J., "Spitzer Observations of the Lambda Orionis cluster I: the frequency of young debris disks at 5 Myr" (2009). The Astrophysical Journal. 123. 10.1088/0004-637X/707/1/705 This Article is brought to you for free and open access by the Astronomy at ScholarWorks@UMass Amherst. It has been accepted for inclusion in Astronomy Department Faculty Publication Series by an authorized administrator of ScholarWorks@UMass Amherst. For more information, please contact
[email protected]. Authors Jesus Hernandez, Nuria Calvet, L. Hartmann, J. Muzerolle, R. Gutermuth, and J. Stauffer This article is available at ScholarWorks@UMass Amherst: https://scholarworks.umass.edu/astro_faculty_pubs/123 Spitzer Observations of the λ Orionis cluster I: the frequency of young debris disks at 5 Myr Jes´us Hern´andez1, Nuria Calvet 2, L. Hartmann2, J. Muzerolle3, R. Gutermuth 4,5, J. Stauffer6
[email protected] ABSTRACT We present IRAC/MIPS Spitzer observations of intermediate-mass stars in the 5 Myr old λ Orionis cluster. In a representative sample of stars earlier than F5 (29 stars), we find a population of 9 stars with a varying degree of moderate 24µm excess comparable to those produced by debris disks in older stellar groups.