TNS Classification Report No. 16366 [ 2024TNSCR..78....1V ]
Date Received (UTC): 2024-01-08 16:33:25 Sender: Vittorio Andreoli
Group: None
Castellani.F, Cazzola.R report/s a classification of object: AT 2023ylu
Type: CV
Remarks: Low resolution spectra was obteined by 1.22-m tlescope + B&C spectrograph (with dispersion 2.25 Ang/pix) located in Asiago (Italy) on 2023-11-12.788 and with 0.25-m telescope + Alpy600 spectrograph (with dispersion 4.9 Ang/pix) located in Novezzina (Italy) on 2023-11-12.823, the spectra show emission of Halpha (6562.8 Ang) and 5573 Ang (sky background), absorption of Hbeta, Hdelta, Hgamma, Hepsilon and He I (4471 Ang) and has a blue continuum. Considered d=0.406 kpc from the 3D dust mapping (Green et al 2019) get E(B-V)≈0.00 B,V,R photometry was also collected with 0.4m telescope + Moravian G4 CCD full frame located in Novezzina (Italy) at 2023/11/12.788 with results B=13.961, V=13.466, R= 13.036 , (B-V)0 =0.495 . Gaia DR2 1857057959447151616 is also present in ZTF database at magnitude 17.9 (filter zg) that’s means Δmag ≈ 5 mag (referring to the magnitude of discovery) All this feature are typically of a dwarf nova outburst, we propose to classified TCP J20315286+2740166 (Gaia DR3 1857057959447151616) as a dwarf nova.
The following Classification spectrum was provided:
Obsdate: 2023-11-12 18:54:43
Instrument: BC-Asi
Telescope: Asiago Galileo Telescope
Details of the object and its spectra can be viewed here: https://www.wis-tns.org/object/2023ylu
Date Received (UTC): 2024-01-08 16:33:25 Sender: Vittorio Andreoli
Group: None
Castellani.F, Cazzola.R report/s a classification of object: AT 2023ylu
Type: CV
Remarks: Low resolution spectra was obteined by 1.22-m tlescope + B&C spectrograph (with dispersion 2.25 Ang/pix) located in Asiago (Italy) on 2023-11-12.788 and with 0.25-m telescope + Alpy600 spectrograph (with dispersion 4.9 Ang/pix) located in Novezzina (Italy) on 2023-11-12.823, the spectra show emission of Halpha (6562.8 Ang) and 5573 Ang (sky background), absorption of Hbeta, Hdelta, Hgamma, Hepsilon and He I (4471 Ang) and has a blue continuum. Considered d=0.406 kpc from the 3D dust mapping (Green et al 2019) get E(B-V)≈0.00 B,V,R photometry was also collected with 0.4m telescope + Moravian G4 CCD full frame located in Novezzina (Italy) at 2023/11/12.788 with results B=13.961, V=13.466, R= 13.036 , (B-V)0 =0.495 . Gaia DR2 1857057959447151616 is also present in ZTF database at magnitude 17.9 (filter zg) that’s means Δmag ≈ 5 mag (referring to the magnitude of discovery) All this feature are typically of a dwarf nova outburst, we propose to classified TCP J20315286+2740166 (Gaia DR3 1857057959447151616) as a dwarf nova.
The following Classification spectrum was provided:
Obsdate: 2023-11-12 18:54:43
Instrument: BC-Asi
Telescope: Asiago Galileo Telescope
Details of the object and its spectra can be viewed here: https://www.wis-tns.org/object/2023ylu