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*2011年度・東京大学・天文学教育研究センター・談話会 [#hb2baa1f] #contents **次回以降の談話会 [#oe253ea5] ***第183回: 2011/10/06(木) 15:30-16:30 [#pd8f2669] 眞山 聡 氏 (総研大) 「すばる+ALMA及びコンピュータシミュレーションで探る連星系原始惑星系円盤」 "Subaru + ALMA Observations and numerical simulations of Protoplanetary Disks in a Young Multiple star" Protoplanetary disks afford a key to an understanding of the formation of our Solar System and other planetary systems. They are the ingredients of planets and play important roles in early stellar evolution. If a forming star with a protoplanetary disk has close companions, the disk may be seriously influenced. This effect should not be ovelooked because most stars form as multiples. Studies of protoplanetary disks in multiple systems are thus important to unravel the general process of star and planet formation. From this point of view, we conducted Subaru direct observations of protoplanetary disks in multiple systems. High angular resolution near-infrared adaptive optics images of young binaries were obtained with the infrared camera Coronagraphic Imager with Adaptive Optics mounted on the 8.2m Subaru Telescope. Our 0."1 resolution images resolve complex circumstellar structures around binary systems. We present our observational result as well as 2D and 3D numerical simulations which reproduce accretion onto the binary system. Additionally, our observational future plans of multiple protoplanetary disks using ALMA will be introduced. ***第184回: 2011/10/13(木) 15:30-16:30 [#s7ff9232] Gaston Folatelli 氏 (東京大学・IPMU) "What spectra reveal of Type Ia Supernovae" I will address the importance of Type Ia supernovae (SNe Ia) as astrophysical objects, and also as distance indicators for cosmology. Based on data from the Carnegie Supernova Project (CSP), I will describe how precision distances are obtained, with a detailed characterization of reddening. The role of optical spectroscopy in improving our understanding of the physical nature of these events will be addressed. In particular, I will show a recent finding of unburned material in a significant fraction of SNe Ia, and its implications on explosion physics. ***第185回: 2011/10/17(月) 15:30-16:30 [#ae49ec35] Wolfgang Gieren 氏 (Universidad de Concepcion) "Improving the extragalactic distance scale with stellar distance indicators: The Araucaria Project" I will review recent progress made in our project towards calibrating the classical Cepheid period-luminosity (PL) relation, both from observing Cepheid samples in nearby galaxies in optical and near-infrared bands, and by applying the Infrared Surface Brightness Technique to Cepheids in the Milky Way and the Magellanic Clouds. Evidence is presented that the K-band PL relation is universal (e.g. independent of the metallicity of the calibrating or target Cepheid samples), and a best absolute PL relation is presented which can be readily used to measure a precision distance to any galaxy containg classical Cepheids. I will also review recent progress in using late-type eclipsing binary systems in the Magellanic Clouds for deriving distances of exquisite (3%) accuracy to the Clouds, setting a very accurate zero point for the distance scale. I will further present our recent determination of the first accurate dynamical masses of two classical Cepheids in the LMC which settle the Cepheid mass discrepancy problem and improve the physical knowledge of Cepheid stars as primary distance indicators. Finally, I will highlight a new spectroscopic method to measure accurate distances to spiral galaxies from their blue supergiant population, and demonstrate that this new technique yields distance results in very good agreement with Cepheids. Quantitative spectroscopy of blue supergiants is also an excellent means to establish correct, unbiased metallicity gradients in the disks of spiral galaxies which are an essential input for galaxy formation and evolution scenarios. **趣旨 [#f6bd15bf] 東京大学・天文学教育研究センターでは2003年4月から, [[院生コロキウム:http://www.ioa.s.u-tokyo.ac.jp/colloquium/wiki/]]に引き続き, 談話会を開いています. ~ 第一線で活躍されている研究者の方々を講師にお招きし, 最先端の研究成果をお話しいただきます. ~ 講師の方には, 大学院生の参加者のことも考慮し, レビュー的な側面も含めた上で, ご自身の研究紹介をお願いしています. **日時 [#r4f01fb8] -木曜日 -15:30-16:30 **場所 [#df07ab0e] -天文センター講義室 **タイムテーブル [#zc14143a] |13:30-14:30|[[院生コロキウム:http://www.ioa.s.u-tokyo.ac.jp/colloquium/wiki/]]|講義室| |15:30-16:30|談話会|講義室| |16:30-|お茶の時間|講義室横のお茶部屋~講師の方を交えて~| **世話人 [#g92e3aea] -田中 培生 -諸隈 智貴: tmorokuma_at_ioa.s.u-tokyo.ac.jp (_at_を@に置き換えてください) **予定 [#nf178987] |BGCOLOR(cyan):#|BGCOLOR(cyan):日付|BGCOLOR(cyan):講演者 (所属)|BGCOLOR(cyan):タイトル| |183|2011/10/06(木)|眞山 聡 氏 (総研大)|「すばる+ALMA及びコンピュータシミュレーションで探る連星系原始惑星系円盤」"Subaru + ALMA Observations and numerical simulations of Protoplanetary Disks in a Young Multiple star"| |184|2011/10/13(木)|Gaston Folatelli 氏 (東京大学・IPMU)|"What spectra reveal of Type Ia Supernovae"| |185|2011/10/17(月)|Wolfgang Gieren 氏 (Universidad de Concepcion)|"Improving the extragalactic distance scale with stellar distance indicators: The Araucaria Project"| |-|2011/11/10(木)|松永 典之 氏 (東京大学・天文センター・木曽観測所)|未定| |-|2011/11/24(木)|高橋 英則 氏 (東京大学・天文センター)|未定| |-|2011/xx/xx(x)|西澤 淳 氏 (東京大学・IPMU)|未定| **終了した談話会 [#p637505a] 詳細はこちら: [[平成23 (2011) 年度談話会]] |BGCOLOR(cyan):#|BGCOLOR(cyan):日付|BGCOLOR(cyan):講演者 (所属)|BGCOLOR(cyan):タイトル| |177|2011/05/19(木)|田村 陽一 氏 (東京大学・天文センター)|「ASTE搭載用超伝導転移端センサ型ボロメータカメラとALMA初期科学運用」| |178|2011/06/16(木)|Michael Richmond 氏 (Rochester Institute of Technology)|"Looking for eclipsing RR Lyr stars in the MACHO database"| |179|2011/06/30(木)|田中 賢幸 氏 (東京大学・IPMU)|"A new method to identify AGNs and the nature of low-luminosity AGNs"| |180|2011/07/07(木)|橋本 哲也 氏 (国立天文台)|"A hint of AGN feedback: Shock heating of ISM induced by a jet in NGC 1068"| |181|2011/07/21(木)|柏川 伸成 氏 (国立天文台)|「AKB48 vs. NMB48 vs. SKE48, そして LAE45vs.LAE54」」, "Completing the Census of Lyα Emitters at the Reionization Epoch"| |182|2011/07/28(木)|上塚 貴史 氏 (東京大学・天文センター)|Mid-infrared spectral monitoring toward AGB stars - Probing the formation of circumstellar dust - | **過去の談話会 [#qdda8e76] -[[平成23 (2011) 年度談話会]] -[[平成22 (2010) 年度談話会:http://www.ioa.s.u-tokyo.ac.jp/danwakai//past/danwakai_H22.html]] -[[平成21 (2009) 年度談話会:http://www.ioa.s.u-tokyo.ac.jp/danwakai//past/danwakai_H21.html]] -[[平成20 (2008) 年度談話会:http://www.ioa.s.u-tokyo.ac.jp/danwakai//past/danwakai_H10.html]] -[[平成19 (2007) 年度談話会:http://www.ioa.s.u-tokyo.ac.jp/danwakai//past/danwakai_H19.html]] -[[平成18 (2006) 年度談話会:http://www.ioa.s.u-tokyo.ac.jp/danwakai//past/danwakai_H18.html]] -[[平成17 (2005) 年度談話会:http://www.ioa.s.u-tokyo.ac.jp/danwakai//past/danwakai_H17.html]] -[[平成16 (2004) 年度談話会:http://www.ioa.s.u-tokyo.ac.jp/danwakai//past/danwakai_H16.html]] -[[平成15 (2003) 年度談話会:http://www.ioa.s.u-tokyo.ac.jp/danwakai//past/danwakai_H15.html]]
