The G305 Star-forming Region. I. Newly Classified Hot Stars

The relatively nearby star-forming complex G305 is one of the most luminous H ii regions in the Galaxy, and it contains several sites and epochs of star formation. Using a combination of near-infrared photometry from “Vista Variables in Via Lactea” ESO Large Public Survey, SDSS-IV APOGEE-2 spectra,...

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Bibliographic Details
Published in:The Astronomical journal 2019-07, Vol.158 (1), p.46
Main Authors: Borissova, Jura, Roman-Lopes, Alexandre, Covey, Kevin, Medina, Nicolas, Kurtev, Radostin, Roman-Zuniga, Carlos, Kuhn, M. A., Contreras Peña, Carlos, Lucas, Philip, Ramirez Alegria, Sebastian, Minniti, Dante, Kounkel, Marina, Stringfellow, Guy, Barbá, Rodolfo H., Suárez, Genaro
Format: Article
Language:English
Subjects:
Astrometry
Astronomy
Emission lines
Galaxies
H II regions
Hot stars
Infrared photometry
Infrared telescopes
Photometry
Radial velocity
Space telescopes
Star & galaxy formation
Star formation
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Summary:The relatively nearby star-forming complex G305 is one of the most luminous H ii regions in the Galaxy, and it contains several sites and epochs of star formation. Using a combination of near-infrared photometry from “Vista Variables in Via Lactea” ESO Large Public Survey, SDSS-IV APOGEE-2 spectra, and Gaia DR2 photometry and astrometry, we report on 29 OB type, Wolf–Rayet, and emission-line stars, 18 of which are newly classified. Most of these hot stars belongs to the main sequence, although some stars of class I are also proposed. The mean radial velocity is RV = −41.8 . The average spectroscopic distance is 3.2 ± 1.6 kpc, while the Gaia DR2 average distance is 3.7 ± 1.8 kpc. Eight objects show light-curve variations with amplitudes greater than 0.5 mag in the K S band.
ISSN:0004-6256
1538-3881
DOI:10.3847/1538-3881/ab276b