Spectral Classification and Properties of the OVz Stars in the Galactic O Star Spectroscopic Survey (GOSSS)

DOI: 
10.3847/0004-6256/152/2/31
Publication date: 
01/08/2016
Main author: 
Arias, Julia I.
IAA authors: 
Sota, Alfredo;Alfaro, Emilio J.
Authors: 
Arias, Julia I.;Walborn, Nolan R.;Simón Díaz, Sergio;Barbá, Rodolfo H.;Maíz Apellániz, Jesús;Sabín-Sanjulián, Carolina;Gamen, Roberto C.;Morrell, Nidia I.;Sota, Alfredo;Marco, Amparo;Negueruela, Ignacio;Leão, João R. S.;Herrero, Artemio;Alfaro, Emilio J.
Journal: 
The Astronomical Journal
Refereed: 
Yes
Publication type: 
Article
Volume: 
152
Pages: 
31
Abstract: 
On the basis of the Galactic O Star Spectroscopic Survey (GOSSS), we present a detailed systematic investigation of the O Vz stars. The currently used spectral classification criteria are rediscussed, and the Vz phenomenon is recalibrated through the addition of a quantitative criterion based on the equivalent widths of the He i λ4471, He ii λ4542, and He ii λ4686 spectral lines. The GOSSS O Vz and O V populations resulting from the newly adopted spectral classification criteria are comparatively analyzed. The locations of the O Vz stars are probed, showing a concentration of the most extreme cases toward the youngest star-forming regions. The occurrence of the Vz spectral peculiarity in a solar-metallicity environment, as predicted by the fastwind code, is also investigated, confirming the importance of taking into account several processes for the correct interpretation of the phenomenon.
Database: 
ADS
SCOPUS
WOK
URL: 
https://ui.adsabs.harvard.edu/#abs/2016AJ....152...31A/abstract
ADS Bibcode: 
2016AJ....152...31A
Keywords: 
stars: early-type;stars: fundamental parameters;surveys;Astrophysics - Solar and Stellar Astrophysics