Spectroscopic observations of novae V1065 CEN and V1280 SCO using 45 cm cassegrain telescope at Arthur C Clarke Institute

Abstract

The spectroscopic observations of two novae namely V1065 CEN and V1280 SCO were made by 45 cm Cassegrain telescope in high resolution ($\lambda/\delta\lambda$=22000) at H$\alpha$ (6563 \r{A}) region. V1065 CEN is He/N-type spectra which characterize a broad (Gaussian FWHM 49 \r{A}), saddle shaped and asymmetric H$\alpha$ emission line without prominent P-Cyg absorption component. Completely different H$\alpha$ profile of V1280 SCO shows prominent P-Cyg absorption and narrow emission line (Gaussian FWHM 26 \r{A}) which can be classified as Fe II type nova. The expansion velocities of these two systems measured from the minima of the P-Cyg profiles are close to 2300 km/s for V1065 CEN, and 716 km/s for V1280 SCO. Based on the photometric analysis, the Nova V1065 CEN can be classified as fast (11$<$t${_2}$$<$25) nova. The derived absolute magnitudes at maximum for nova V1065 CEN to be M$_{o,V}$ = -7.58$\pm$0.18 and M$_{o,B}$= -7.75$\pm$0.25 correspond to a distance 8.51$\pm$0.33 kpc. The parameters t$_{2V}$=12 days and t$_{3V}$=14 days of nova V1280 SCO determine that the nova is in between very fast and fast nova. The mean absolute magnitude at maximum is calculated to be M$_{o,V}$=-8.7$\pm$0.1 and the estimated distance to the nova V1280 SCO is 3.2$\pm$0.2 kpc.