# Radial Velocity Survey of Nearby OB Stars

## TL;DR

This study monitors nearby OB stars' radial velocities to identify binaries with small mass ratios, confirming some short-term variations and emphasizing the need for more data to determine precise orbital parameters.

## Contribution

It presents ongoing radial velocity observations of OB stars aiming to detect low-mass ratio binaries, with initial findings of short-term velocity variations.

## Key findings

- Radial velocity variations observed in some targets within weeks.
- Initial evidence of potential binary systems with small mass ratios.
- Further data required for accurate orbital period and mass distribution estimates.

## Abstract

We report on the current status of the radial velocity monitoring of nearby OB stars to look for binaries with small mass ratios. The combined data of radial velocities using the domestic 1-2 m-class telescopes seems to confirm the variations of radial velocities in a few weeks for four out of ten target single-lined spectroscopic binaries. More data are needed to estimate the exact periods and mass distributions.