Spectroscopy and photometry of transient ASASSN-21nv
ATel #14817; U. Munari (INAF Padova), A. Maitan (ANS Collaboration)
on 29 Jul 2021; 22:08 UT
Credential Certification: U. Munari (ulisse.munari@oapd.inaf.it)
Subjects: Optical, Cataclysmic Variable, Nova
The transient ASASSN-21nv has been discovered by ASAS-SN survey on Jul 28.56
at g=14.3 mag and reported as a possible nova to the Transient Name Server
(TNS) by K.Z. Stanek and Z. Way (on behalf of the ASAS-SN team) where it
received the designation AT 2021ufe.
We have obtained a photometric observation of ASASS-21nv on July 29.105 UT
with ANS Collaboration telescope ID 2202. PSF-fitting photometry has been
applied because the transient is located close to a field star, about
10arcsec away and quite red in color. We have measured B=14.807, V=14.366,
R=14.031, I=13.749 for ASASS-21nv and B=18.00, V=16.44, R=15.238, I=14.261
for the field star.
A low resolution spectrum (range 3200-8000 Ang, dispersion 2.31 Ang/pix) of
ASASSN-21nv has been recorded on July 29.896 UT with the Asiago 1.22m + B&C
spectrograph. The spectrum is characterized by a smooth and hot continuum,
with Halpha in moderate and narrow emission, and Hbeta and Hgamma as
emission cores within a larger absorption. The spectrum suggests that
ASASSN-21nv is a cataclysmic variable in outburst.
