Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-03-27
Astrophys.J.644:525-542,2006
Astronomy and Astrophysics
Astrophysics
47 pages, 6 figures, AASTeX preprint (accepted for publication in the Astrophysical Journal); refined the text parts of table
Scientific paper
10.1086/503381
By searching the IRAS and ISO databases we compiled a list of 60 debris disks which exhibit the highest fractional luminosity values (fd>10^-4) in the vicinity of the Sun (d<120pc). Eleven out of these 60 systems are new discoveries. Special care was taken to exclude bogus disks from the sample. We computed the fractional luminosity values using available IRAS, ISO, and Spitzer data, and analysed the galactic space velocities of the objects. The results revealed that stars with disks of high fractional luminosity often belong to young stellar kinematic groups, providing an opportunity to obtain improved age estimates for these systems. We found that practically all disks with fd>5x10^-4 are younger than 100Myr. The distribution of the disks in the fractional luminosity versus age diagram indicates that (1) the number of old systems with high fd is lower than was claimed before; (2) there exist many relatively young disks of moderate fractional luminosity; and (3) comparing the observations with a current theoretical model of debris disk evolution a general good agreement could be found.
Ábrahám Peter
Apai Daniel
Derekas Aliz
Grady Carol
Henning Th
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