Search for Exozodiacal Dust: Are Vega-like Stars Common ?

• Takanori HIRAO

  Graduate School of Science, Nagoya University

• Hiroshi MATSUO

  National Astrononomical Observatory

• Shinji MATSUURA

  The Institute of Space and Astronautical Science

• Hiroshi MURAKAMI

  The Institute of Space and Astronautical Science

• Manabu NODA

  Nagoya City Science Museum

• Takafumi OOTSUBO

  Graduate School of Science, The University of Tokyo

• Munetaka UENO

  Graduate School of Arts and Science, The Univesity of Tokyo

Abstract

Possible observations of Vega-like stars by the ASTRO-F and the HII/L2 3.5m space telescope are proposed. Vega-like stars are main sequence stars with mid-infrared and/or far-infrared excess. A few of these stars have been observed precisely at various wavelengths and it was found out that they tend to have hot (〜300K) circumstellar dust like the zodiacal dust in our solar system and warm (〜50K) dust ring around 30{50 AU from the central star. In spite of thesediscoveries, one question still remains; How many Vega-like stars are there? Mid- and far-infrared surveys by the ASTRO-F and the HII/L2 telescope will be the best ones to get the answer to this question. The ASTRO-F/FIS survey could detect `α Lyr' located at a distance of <50pc, within which roughly 150 of A-type main sequence stars exist. The HII/L2 3.5m telescope survey has the capability to detect much farther, up to 100pc. Thus, the total number of candidates will increase to as many as 〜1000.

Journal

• The Institute of Space and Astronautical Science report. S.P.

  The Institute of Space and Astronautical Science report. S.P. 14 19-25, 2000-12

  Japan Aerospace Exploration Agency

Details

• CRID: 1570291227339618816
• NII Article ID: 110006265091
• NII Book ID: AA10455137
• ISSN: 0288433X
• Text Lang: en
• Data Source:
  • CiNii Articles