Spectroscopy of 9 eruptive young variables using TANSPEC

TL;DR

This study uses the TANSPEC spectrograph on the 3.6m Devasthal Telescope to analyze the spectral features of nine eruptive young variable stars, providing insights into their accretion processes and disc evolution.

Contribution

First-time spectroscopic analysis of nine FUors and EXors using TANSPEC, linking spectral features with physical accretion mechanisms and disc evolution.

Findings

Spectral line profiles vary among the sources.

Comparison with theoretical models suggests diverse accretion dynamics.

Highlights the importance of time-resolved spectroscopy for young star evolution.

Abstract

In recent times, 3.6m Devasthal Optical Telescope (DOT) has installed an optical to near infra-red spectrograph, TANSPEC, which provides spectral coverage from 0.55-2.5 microns. Using TANSPEC, we have obtained a single epoch spectrum of a set 9 FUors and EXors. We have analysed line profiles of the sources and compared with the previously published spectra of these objects. Comparing the line profile shapes with the existing theoretical predictions, we have tried to interpret the physical processes that are responsible for the current disc evolution and the present accretion dynamics. Our study has shown the importance for time evolved spectroscopic studies for better understanding the evolution of the accretion mechanisms. This in turn can help in better categorisation of the young stars displaying episodic accretion behaviour.