Please use this identifier to cite or link to this item: https://www.um.edu.mt/library/oar/handle/123456789/86509
Title: Spectroscopic and photometric observations of dwarf nova superoutbursts by the 3.8 m telescope Seimei and the Variable Star Network
Authors: Tampo, Yusuke
Isogai, Keisuke
Kojiguchi, Naoto
Maehara, Hiroyuki
Taguchi, Kenta
Kato, Taichi
Kimura, Mariko
Wakamatsu, Yasuyuki
Shibata, Masaaki
Nogami, Daisaku
Kawabata, Miho
Maeda, Keiichi
Namekata, Kosuke
Okamoto, Soshi
Otsuka, Masaaki
Burgaz, Umut
Nagoshi, Shumpei
Itoh, Hiroshi
Vanmunster, Tonny
Tordai, Tamás
Stone, Geoffrey
Matsumoto, Katsura
Fujii, Daiti
Matsumura, Ryota
Nakagawa, Momoka
Takeuchi, Nodoka
Zenkou, Yuki
Pavlenko, Elena P.
Antonyuk, Kirill A.
Pit, Nikolaj V.
Antonyuk, Oksana I.
Babina, Julia V.
Baklanov, Aleksei V.
Sosnovskij, Aleksei A.
Shugarov, Sergey Yu
Katysheva, Nataly
Chochol, Drahomír
Dvorak, Shawn
Dubovsky, Pavol A.
Medulka, Tomáš
Kudzej, Igor
Kiyota, Seiichiro
Zubareva, Alexandra M.
Belinski, Alexandr A.
Ikonnikova, Natalia P.
Burlak, Marina A.
Sano, Yasuo
Mizutani, Masanori
Ruiz, Javier
Pickard, Roger D.
Hambsch, Franz-Josef
Dufoer, Sjoerd
Brincat, Stephen M.
Galdies, Charles
Menzies, Kenneth
Moriyama, Masayuki
Hiraga, Mitsutaka
Maeda, Yutaka
Hirosawa, Kenji
Funada, Masao
Yamamoto, Minoru
Keywords: Accretion (Astrophysics)
Stars, New
Dwarf novae
Dwarf stars
Issue Date: 2021
Publisher: Oxford University Press
Citation: Tampo, Y., Isogai, K., Kojiguchi, N., Maehara, H., Taguchi, K., Kato, T.,…Yamamoto, M. (2021). Spectroscopic and photometric observations of dwarf nova superoutbursts by the 3.8 m telescope Seimei and the Variable Star Network. Publications of the Astronomical Society of Japan, 73 (3), 753-771.
Abstract: We present spectroscopic and photometric observations of 17 dwarf-nova superoutbursts obtained by KOOLS-IFU mounted on the 3.8 m telescope Seimei at the Okayama Observatory of Kyoto University and through the Variable Star Network collaboration (VSNET). Our spectroscopic observations for six outbursts were performed within 1 d of their optical peak. 11 objects (TCP J00590972+3438357, ASASSN-19ado, TCP J06073081−0101501, ZTF20aavnpug, ASASSN-19ady, MASTER OT J061642.05+435617.9, TCP J20034647+1335125, ASASSN-20kv, ASASSN- 20kw, MASTER OT J213908.79+161240.2, and ASASSN-20mf) were previously unknown systems, and our observations enabled quick classification of their transient type. These results illustrate that the Seimei telescope has the capability to conduct quick follow-up observations of unknown transients. Our photometric observations yielded that 11 of the objects are WZ Sge-type dwarf novae and their candidates, and the other six are SU UMa-type dwarf novae and their candidates. The He II 4686A° emission line was clearly detected among ASASSN-19ado, TCP J06073081−0101501 and MASTER OT J213908.79+161240.2, the association of which with a spiral arm structure in an accretion disk has been suggested in previous studies. Our result suggests that a higher-inclination system shows a stronger emission line of He II 4686A° , as well as larger-amplitude early superhumps.
URI: https://www.um.edu.mt/library/oar/handle/123456789/86509
Appears in Collections:Scholarly Works - InsESEMP



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