11月13日（火）13：30～15：00 太陽系小天体セミナー 南棟２階会議室
Nov 13 Tue Solar System Minor Body Seminar Conference Room, South Bldg.2F
11月13日（火）16：00～17：00 国立天文台談話会 大セミナー室
Nov 13 Tue NAOJ Seminar Large Seminar Room
11月16日（金）13：30～15：00 太陽天体プラズマセミナー 院生セミナー室
Nov 16 Fri Solar and Space Plasma Seminar Student Seminar Room, Subaru Bldg.
詳細は以下をご覧下さい。
11月13日（火）
- キャンパス
- 三鷹
- セミナー名
- 太陽系小天体セミナー
- 定例・臨時の別
- 定例
- 日時
- 11月13日（火曜日）13時30分～15時
- 場所
- 南棟２階会議室
- 講演者
- 佐藤幹哉
- タイトル
- アイスランド遠征観測の報告
- Abstract
- 10月きりん座流星群と10月りゅう座流星群の両方を観測するためアイ
スランドに遠征した。観測データ自体はまだ集計中であるが、珍しい場所での遠
征観測の状況を報告する。 - 連絡先
- 名前：渡部潤一
- 備考
- テレビ会議またはスカイプによる参加も可
11月13日（火）
- Campus
- Mitaka
- Seminar
- NAOJ seminar
- Regularly Scheduled/Sporadic
- Scheduled
- Date and time
- Tuesday, Nov 13 16:00-17:00
- Place
- Large Seminar Room
- Speaker
- Sylvain Bontemps
- Affiliation
- Bordeaux University
- Title
- “High-mass star and cluster formation – What do recent ALMA observations tell us?”
- Abstract
-
High-mass stars are rare and their collapsing precursors (high-mass protostars) are therefore
usually observed at kpc distances and in cluster forming conditions. To resolve individual collapsing
high-mass cores, only interferometers can be used. I will review the results of our group on
the hunt(s) for high-mass precursors using IRAM NOEMA and ALMA in the recent years.
These works clearly show that high-mass class 0 YSOs exist with envelope masses and outflows
in the expected ranges to reach at least the O-star regime (above 20 Msun) but the pre-collapse
phases (so called high-mass pre-stellar cores) are still difficult to track down with only a couple of
convincing examples known so far. This extreme rare occurrence of high-mass pre-stelalr cores
clearly point to a fast formation process which will be discussed in the context of the dynamical view
for star and cluster formation and in relationship with the new filament paradigm for low mass star formation. - Facilitator
- -Name： Narukage, Noriyuki
11月16日（金）
- Campus
- Mitaka
- Seminar
- Solar and Space Plasma Seminar
- Regularly Scheduled/Sporadic
- Regular
- Date and time
- 16 November (Fri), 13:30-15:00
- Place
- Student Seminar Room, Subaru Bldg.
- Speaker
- Joten Okamoto
- Affiliation
- National Astronomical Observatory of Japan
- Title
- The strongest magnetic fields in sunspots and their statistical properties
- Abstract
-
Sunspots are concentrations of magnetic fields on the solar surface.
Then, where is the strongest field in each sunspot? It is generally located in an umbra, but sometimes stronger fields are found outside umbrae, such as a penumbra and a light bridge. The formation mechanism of such strong fields outside umbrae is still puzzling. Now we have numerous high-quality datasets taken with the Hinode/Spectro-Polarimeter over 10 years, which motivate us to address this question via a statistical analysis of strongest fields in sunspots. Hence, we complied a ranking list of active regions by their largest field strengths and investigated conditions for appearance or formation of strong magnetic fields. In this seminar, we will introduce a sunspot with a field strength of 6250 G as a case study, and then discuss the key features to produce strong fields in a statistical sample. - Facilitator
- -Name：Shin Toriumi
- Comment