368 citations · 1.3k across the 44 of their papers we have counts for
44 papers
Seimei KOOLS-IFU mapping of the gas and dust distributions in Galactic PNe: Unveiling the origin and evolution of Galactic halo PN H4-1
Masaaki Otsuka, Toshiya Ueta, Akito Tajitsu
H4-1 is a planetary nebula (PN) located in the Galactic halo, and is notably carbon-rich and one of the most metal-deficient PNe in the Milky Way. To unveil its progenitor evolutio…
Probing the origin of the two-component structure of broad line region by reverberation mapping of an extremely variable quasar
Shumpei Nagoshi, Fumihide Iwamuro, Satoshi Yamada +5
The physical origins of quasar components, such as the broad line region (BLR) and dust torus, remain under debate. To gain insights into them, we focused on Changing-State Quasars…
The messy death of a multiple star system and the resulting planetary nebula as observed by JWST
Orsola De Marco, Muhammad Akashi, Stavros Akras +66
Planetary nebulae (PNe), the ejected envelopes of red giant stars, provide us with a history of the last, mass-losing phases of 90 percent of stars initially more massive than the…
The [S II] Spectral Images of the Planetary Nebula NGC 7009: II. Major Axis
Siek Hyung, Seong-Jae Lee, Masaaki Otsuka
We derived position-velocity density distribution diagrams along the major (PA = 77) axis of the elliptical planetary nebula NGC 7009 with the Keck HIRES [SII] 6716/6731…
Time-Variable Jet Ejections from RW Aur A, RY Tau and DG Tau
Michihiro Takami, Hans Moritz Guenther, P. Christian Schneider +17
We present Gemini-NIFS, VLT-SINFONI and Keck-OSIRIS observations of near-infrared [Fe II] emission associated with the well-studied jets from three active T Tauri stars; RW Aur A,…
On the N/O abundance ratio and the progenitor mass for the most luminous planetary nebulae of M 31
Toshiya Ueta, Masaaki Otsuka
Plasma diagnostics are the bases of investigation into the physical and chemical properties of line-emitting gaseous systems. To perform plasma diagnostics properly, it is essentia…