Examination of the Relationship Between Spectral Type and Stellar Rotational Velocity in $\sim$50,000 Single Stars

Summary

This study examines the relationship between spectral type (ST) and stellar rotational velocity (vsini) in approximately 50,000 single stars across various evolutionary stages. The results show a notable decline in vsini as the spectral type progresses from early to late types.

Highlights

• The study uses a large sample of single stars to investigate the relationship between ST and vsini.
• The results demonstrate a significant decrease in vsini values between hot stars (STs O0 to F2) and cool stars (STs F2 to M9).
• The study also explores the relationship between vsini and luminosity class (LC).
• The Gaussian modeling method is used to derive fitting variables for vsini and ST.
• The study finds that late-A type stars exhibit a notable decline in velocity compared to early-A type stars.
• The results show that the granulation boundary shifts to the hotter region as stars evolve.
• The study suggests that magnetic braking and stellar winds contribute to the slowdown of vsini in cool and hot stars, respectively.

Key Insights

• The relationship between ST and vsini is complex and influenced by various factors, including the convective and radiative layers of the stars.
• The study's findings are consistent with previous research, which suggests that magnetic braking plays a significant role in reducing vsini in late-type stars.
• The results demonstrate that the vsini-ST distribution is not uniform and exhibits distinct peaks for different ST ranges.
• The study highlights the importance of considering the evolutionary status of stars when investigating the relationship between ST and vsini.
• The findings suggest that the granulation boundary plays a crucial role in shaping the vsini-ST relationship, particularly in the later stages of stellar evolution.
• The study's use of a large sample of single stars and Gaussian modeling provides a robust and reliable analysis of the vsini-ST relationship.
• The results have implications for our understanding of stellar rotation and its impact on stellar evolution and structure.

Mindmap

Citation

Mert, B., Ahmet, U., & Cenk, K. (2024). Examination of the Relationship Between Spectral Type and Stellar Rotational Velocity in $\sim$50,000 Single Stars (Version 1). arXiv. https://doi.org/10.48550/ARXIV.2412.18412