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

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 Hγ and He λλ 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.

Accepted to AAS Journals (29 pages, 6 figures)

References in corpus (9)

• A Grid of NLTE Line-Blanketed Model Atmospheres of Early B-type Stars
• Age Gradients in the Stellar Populations of Massive Star Forming Regions Based on a New Stellar Chronometer
• The Carina Nebula and Gum 31 molecular complex: I. Molecular gas distribution, column densities and dust temperatures
• The deep OB star population in Carina from the VST Photometric H$\alpha$ Survey (VPHAS+)
• A Catalog of New Spectroscopically Confirmed Massive OB Stars in Carina
• Gaia-ESO Survey: global properties of clusters Trumpler 14 and 16 in the Carina Nebula
• A radial velocity survey of the Carina Nebula's O-type stars
• Extended Red Objects and Stellar Wind Bow Shocks in the Carina Nebula
• Gaia-ESO Survey: Gas dynamics in the Carina Nebula through optical emission lines

Cited by in corpus (6)

• A Gaia view of the two OB associations Cygnus OB2 and Carina OB1: The signature of their formation process
• Carina's Pillars of Destruction: the view from ALMA
• Trumpler 16-26: A New Centrifugal Magnetosphere Discovered via SDSS/APOGEE H-band Spectroscopy
• Detection of new O-type stars in the obscured stellar cluster Tr 16-SE in the Carina Nebula with KMOS
• GG Carinae: orbital parameters and accretion indicators from phase-resolved spectroscopy and photometry
• Gaia-ESO Survey: massive stars in the Carina Nebula. II. The spectroscopic analysis of the O-star population