BM UMa: a middle shallow contact binary at pre-transition stage of evolution from W-type to A-type

TL;DR

This study analyzes photometric data of BM UMa, revealing its pre-transition evolutionary stage from W-type to A-type contact binary, characterized by period decrease, mass transfer, and increasing contact degree.

Contribution

It provides new observational evidence of BM UMa's evolutionary status, including period analysis and contact degree changes, highlighting its transition phase.

Findings

Period decreasing at -3.36×10^{-8} d/yr

Contact degree increased from 8.8% to 23.2% between 2007 and 2020

Binary is at pre-transition stage from W-type to A-type

Abstract

In this study, all unpublished time series photometric data of BM UMa ($q \sim$ 2.0, P = 0.2712\,d) from available archives were re-investigated together with new data taken from the TNT-2.4m of the Thai National Observatory (TNO). Based on period analysis, there is a short-term variation superimposed on the long-term period decrease. The trend of period change can be fitted with a downward parabolic curve indicating a period decrease at a rate of $\mathrm{d}P/\mathrm{d}t = -3.36(\pm 0.02)\times10^{-8}$ d $\textrm{yr}^{-1}$. This long-term period decrease can be explained by mass transfer from the more massive component ($M_2 \sim 0.79 M_{\odot}$) to the less massive one ($M_1 \sim 0.39 M_{\odot}$), combination with AML. For photometric study, we found that the binary consists of K0\,V stars and at the middle shallow contact phase with evolution of fill-out factor from 8.8\,\% (in 2007) to 23.2\,\% (in 2020). Those results suggest that the binary is at pre-transition stage of evolution from W-type to A-type, agreeing to the results of statistical study of W-type contact binaries. The mass of $M_2$ will be decreased close to or below $M_1$ and the mass ratio will be decreased ($q < 1.0$). By this way, the binary will evolve into A-type as a deeper normal over-contact system with period increase. Finally the binary will end as a merger or a rapid-rotating single star when the mass ratio meet the critical value ($q < 0.094$), as well as produce a red nova.