High Resolution 30 micro m Imaging of the Homunculus Nebula of Eta Carinae

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Description

SPICA Science Conference from Exoplanets to Distant Galaxies: SPICA's New Window on the Cool Universe (June 18-21, 2013. Ito Hall, the University of Tokyo), Bunkyou-ku, Tokyo, Japan

We present a result of high-resolution 30 μm imaging observations of the Homunculus Nebula of Eta Carinae (η Car). The Homunculus Nebula is known to contain a large amount of cool dust (approximately 100 K) at polar lobes and a equatorial torus. While the distribution of the cool dust shows the past dust formation events on Car such as giant eruptions and binary interactions, no spatially resolved images at long mid-infrared wavelengths (30-50 μm) have been obtained. We observed Car with a mid-infrared camera MAX38 on the University of Tokyo Atacama 1.0-m telescope, and successfully obtained spatially resolved images of the Homunculus Nebula at 18.7, 31.7 and 37.3 μm. The observations revealed the structure of the massive equatorial torus which contains the dust of 0.09 solar mass. This amount is equal to approximately 80% of the total dust mass 0.12 solar mass in the Homunculus Nebula. It is also found that the dust of 0.012 solar mass exists inside the polar lobes. Assuming that the dust was constantly formed after the giant eruption occurred in 1843, the dust formation rate is estimated as 7 × 10(exp -5)solar mass yr(exp -1). This indicates that the binary interaction plays a significant role in the dust formation on Car.

著者人数: 29名

形態: カラー図版あり

Number of authors: 29

Physical characteristics: Original contains color illustrations

資料番号: AA1730027053

レポート番号: JAXA-SP-17-010E

Journal

Details 詳細情報について

  • CRID
    1050574036225177856
  • NII Article ID
    120006827260
  • ISSN
    24332232
  • Web Site
    http://id.nii.ac.jp/1696/00003024/
  • Text Lang
    en
  • Article Type
    conference paper
  • Data Source
    • IRDB
    • CiNii Articles

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