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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents



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ID: 447977.0, MPI für Astronomie / Publikationen_mpia
HD 100453: an evolutionary link between protoplanetary disks and debris disks
Authors:Collins, K. A.; Grady, C. A.; Hamaguchi, K.; Wisniewski, J. P.; Brittain, S.; Sitko, M.; Carpenter, W. J.; Williams, J. P.; Mathews, G. S.; Williger, G. M.; van Boekel, R.; Carmona, A.; van den Ancker, M. E.; Meeus, G.; Chen, X. P.; Petre, R.; Woodgate, B. E.; Henning, Th
Language:English
Publisher:AIP, Springer
Date of Publication (YYYY-MM-DD):2009
Title of Proceedings:Cool Stars, Stellar Systems and the Sun
Start Page:409
End Page:411
Title of Series:AIP Conference Proceedings
Volume (in Series):1094
Name of Conference/Meeting:15th Cambridge Workshop on Cool Stars
Review Status:not specified
Audience:Experts Only
Abstract / Description:We present a multi-wavelength examination of the disk and environment of the near-ZAMS Herbig Ae star HD 100453 A. Chandra ACIS-S imagery shows that the Herbig Ae star has Lx/Lbol and a pulse height spectrum similar to beta Pic Moving Group early F stars, suggesting a similar magnetic field configuration and X-ray production in winds. The disk lacks the conspicuous Fe II emission and continuum seen in FUV spectra of actively accreting Herbig Ae stars, and FUSE, HST ACS FUV, and FEROS data suggest a 3sigma upper limit on accretion rate of 4.0×10-10 Msolar yr-1. Weak, variable Halpha and Brgamma emission suggest low levels of intermittent accretion or contamination by stellar activity. We confirm that HD 100453 B is a common proper motion companion to HD 100453 A, with a spectral type of M4.0V-M4.5V, and derive an age of 14+/-4 Myr. It is likely the companion has truncated the circumprimary disk radius at less than ~50 AU, and we estimate the dust mass to be ~0.1 MJ. A sensitive upper limit to the CO J = 3-2 intensity indicates that the gas in the outer disk is likely optically thin. Assuming a [CO]/[H2] abundance of 1×10-4 and a depletion factor of 103, we find that the mass of cold molecular gas is less than ~0.33 MJ and that the gas-to-dust ratio is no more than ~4:1 in the outer disk.
Free Keywords:circumstellar matter; stars; accretion disks
Comment of the Author/Creator:Date: 2009, February 1, 2009
External Publication Status:published
Document Type:Conference-Paper
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:ISBN:978-0735406278 %R 10.1063/1.3099134 [ID No:1]
URL:http://adsabs.harvard.edu/abs/2009AIPC.1094..409C [ID No:2]
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