Stellar Parameters and Radial Velocities of Hot Stars in the Carina Nebula

TL;DR

This study provides detailed spectroscopic parameters and radial velocities for 115 hot stars in the Carina Nebula, revealing a young, dynamically unrelaxed stellar population with numerous binary candidates.

Contribution

First comprehensive spectroscopic analysis of hot stars in the Carina Nebula, including stellar parameters, radial velocities, and binary candidate identification.

Findings

High radial velocity dispersion indicates a young, unrelaxed stellar population.

Identification of 31 single-lined spectroscopic binary candidates.

Derived stellar parameters such as masses, ages, and luminosities for the sample.

Abstract

The Carina Nebula is an active star forming region in the southern sky that is of particular interest due to the presence of a large number of massive stars in a wide array of evolutionary stages. Here we present the results of the spectroscopic analysis of 82 B-type stars and 33 O-type stars that were observed in 2013 and 2014. For 82 B-type stars without line blending, we fit model spectra from the Tlusty BSTAR2006 grid to the observed profiles of H{\gamma} and He {\lambda}{\lambda} 4026, 4388, and 4471 to measure the effective temperatures, surface gravities, and projected rotational velocities. We also measure the masses, ages, radii, bolometric luminosities, and distances of these stars. From the radial velocities measured in our sample, we find 31 single lined spectroscopic binary candidates. We find a high dispersion of radial velocities among our sample stars, and we argue that the Carina Nebula stellar population has not yet relaxed and become virialized.