博士論文 - 学術データベース

OROSZ Gabor - 鹿児島大学 博士(理学) - 末期恒星進化研究のための水酸基及び水メーザー源に対する超長基線電波干渉法による高精度天体位置計測

  1. 鹿児島大学 (4781)
  2. 博士(理学) (139)
  3. OROSZ Gabor

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書誌事項

タイトル

Exploring high precision VLBI astrometry of hydroxyl and water masers to study late stellar evolution

タイトル別名

Exploring high precision VLBI astrometry of hydroxyl and water masers to study late stellar evolution

タイトル別名

末期恒星進化研究のための水酸基及び水メーザー源に対する超長基線電波干渉法による高精度天体位置計測

著者名

OROSZ Gabor

学位授与大学

鹿児島大学

取得学位

博士(理学)

学位授与番号

甲理工研第446号

学位授与年月日

2017-03-24

注記・抄録

This PhD thesis has two main topics: technical studies of VLBI astrometry at L-band and astrometric measurements of OH and H2O masers to study late stellar evolution. The technical studies focus on mitigating spatial systematic errors caused by the ionosphere, the bane of VLBI measurements at low-frequencies, which hinder the astrometric applicability of one of the best stellar tracers, 1.6 GHzOH masers. We need to figure out how to do precise astrometry of OH masers; doing this would make it possible to measure accurate distances to evolved stars with heavy dust shells and high mass loss rates, the lack of which impeded on the better understanding of stellar evolution for far too long. This work provides an overview of relative VLBI astrometry from the point of view of error analysis, then goes on to demonstrate new calibration and analysis methods to achieve high precision astrometry at L-band. Some OH maser parallaxes are also measured in the process, but their application to study stellar evolution is ongoing. Additionally, the first results related to H2O masers in the fast outflows of water fountain stars are also presented, with a focus on better understanding the evolutionary process between evolved stars and planetary nebulae.

各種コード

NII論文ID(NAID)
500001033594
NII著者ID(NRID)
  • 8000001141131
本文言語コード
  • eng
大学ID

0077

CAT機関ID

KI000935

データ提供元
  • 機関リポジトリ
  • NDLデジタルコレクション

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