HUSCAP logo Hokkaido Univ. logo

Hokkaido University Collection of Scholarly and Academic Papers >
Institute of Low Temperature Science >
Peer-reviewed Journal Articles, etc >

Thermal desorption of Na in meteoroids Dependence on perihelion distance of meteor showers

Files in This Item:
aa5330-06.pdf91.49 kBPDFView/Open
Please use this identifier to cite or link to this item:

Title: Thermal desorption of Na in meteoroids Dependence on perihelion distance of meteor showers
Authors: Kasuga, T. Browse this author
Yamamoto, T.2 Browse this author →KAKEN DB
Kimura, H. Browse this author
Watanabe, J. Browse this author
Authors(alt): 山本, 哲生2
Keywords: meteors
Issue Date: Jul-2006
Journal Title: Astronomy & Astrophysics
Volume: 453
Issue: 2
Start Page: L17
End Page: L20
Publisher DOI: 10.1051/0004-6361:20065330
Abstract: Context.The observed sodium abundance of meteoroids in meteor showers might differ from the original abundance because of processing in interplanetary space after ejections from their parent bodies. Among various processes, thermal alteration of alkali silicate is most likely the major process of Na depletion. Aims.We clarify at which perihelion distances the thermal desorption alters the Na content of meteoroids that are observed as meteor showers. Methods.We compile Na abundances of meteoroids in meteor showers at each perihelion distance and compare them to the sublimation temperatures of alkali silicates. Results.Na abundances of meteoroids do not depend on their perihelion distances at AU. No Na depletion in these distances constrains the temperature of meteoroids at q=0.14 AU to be lower than the sublimation temperature of alkali silicates K. Conclusions.Meteoroid particles are characterized as large, compact, blackbody- like particles. On orbit with perihelion distances q < 0.1 AU, meteoroids would show evidence of thermal desorption of metals, in particular, Na.
Rights: Copyright(c)ESO2006
Type: article
Appears in Collections:低温科学研究所 (Institute of Low Temperature Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 山本 哲生

Export metadata:

OAI-PMH ( junii2 , jpcoar_1.0 )

MathJax is now OFF:


 - Hokkaido University