Spectral study of V565 Mon: Probable FU Ori-like or chemically peculiar star

TL;DR

This study provides a detailed spectroscopic analysis of V565 Mon, a young star with unique spectral features, estimating its parameters and suggesting it belongs to an intermediate class between T Tauri and Herbig Ae/Be stars.

Contribution

The paper offers the first detailed spectroscopic characterization of V565 Mon, highlighting its unusual Ba II lines and proposing its classification as an intermediate young star.

Findings

V565 Mon has a bolometric luminosity of approximately 130 L_sun.

It exhibits strong Ba II absorption lines uncommon in young stars.

The star may belong to an intermediate class between T Tauri and HAeBe stars.

Abstract

We present the detailed spectroscopic study of V565 Mon pre-main-sequence star, which is the illuminating star of Parsamian 17 cometary nebula. Observations were performed with 2.6 m telescope in Byurakan Astrophysical Observatory in 15 February 2018. Radial velocities and equivalent widths of the most prominent lines of V565 Mon are presented. We built the spectral energy distribution and estimated the main parameters of the star, for example obtained bolometric luminosity of V565 Mon is $L_{V565}\approx 130L_{\odot} $ . Considering all features of V565 Mon we came to conclusion that this young intermediate-mass star can belongs to some intermediate class between T Tau and HAeBe stars. Very unusual for a young star is the presence of strong absorption Ba II lines in the spectrum. Possible explanations on this issue are discussed. Hence, we think that V565 Mon is a unique example, which can help to understand some open questions in nucleosynthesis problem in young stars.