Classification certificate for object 2019tlu
TNS Classification Report No. 5382 [ 2019TNSCR2214....1T ]

Date Received (UTC): 2019-10-28 11:22:32
Sender: Dr. Lina Tomasella
Group: Padova-Asiago

L. Tomasella, S. Benetti, E. Cappellaro, M. Turatto (INAF Osservatorio Astronomico di Padova) report/s a classification of object: AT 2019tlu

Type: CV

Remarks: The spectrum shows a blue continuum with narrow Halpha, Hbeta and Hgamma in emission at the rest wavelength. The transient is therefore a cataclysmic variable (CV). The Balmer decrement from the emission components, with the presence of a fairly strong Halpha and higher members of the series showing progressively stronger absorptions, confirms the classification as a dwarf nova. Also the He I emission at 587.6 nm is clearly visible

The following Classification spectrum was provided:

Obsdate: 2019-10-27 21:36:00
Instrument: AFOSC
Telescope: Asiago Ekar Telescope

Details of the object and its spectra can be viewed here: https://wis-tns.weizmann.ac.il/object/2019tlu