[vsnet-alert 25635] ASASSN-21eo: AM CVn star candidate?

反保雄介 tampo at kusastro.kyoto-u.ac.jp
Fri Apr 2 21:31:46 JST 2021

ASASSN-21eo: AM CVn star candidate?

Kyoto Univ. Obs., Sano-san, and Itoh-san have reported the observation of
ASASSN-21eo (= TCP J06161010+1243200). This outburst was detected on 31st
March by ASAS-SN at 13.8 mag (see vsnet-alert 25620, 25625). The quiescence
counterpart is ~21 mag in ZTF DR5 data, therefore the outburst amplitude is
~7 mag.
This object has already faded by ~2 mag in 2 days, suggesting ASASSN-21eo
can be an AM CVn star, or less likely double superoutburst WZ Sge-type
dwarf nova.

Daily snapshots are highly recommended to catch the onset of its second

ASASSN-21eo 20210331.232 13.794g ASASSN
ASASSN-21eo 20210401.418 15.368C Sano
ASASSN-21eo 20210401.455 15.604CV KU
ASASSN-21eo 20210401.483 >14.0C Itoh
ASASSN-21eo 20210402.207 16.887zr ZTFLasair
ASASSN-21eo 20210402.236 15.457g ASASSN <- can be contaminated
ASASSN-21eo 20210402.469 >15.4C KU



京都大学大学院理学研究科宇宙物理学教室 D1
Kyoto University, Graduate School of Department of Astronomy, PhD candidate
反保 雄介 Yusuke TAMPO
MAIL: tampo at kusastro.kyoto-u.ac.jp


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