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

Jura Borissova, Alexandre Roman-Lopes, Kevin R. Covey, Nicolas Medina, Radostin Kurtev, Carlos Roman-Zuniga, M. A. Kuhn, Carlos Contreras Peña, Philip Lucas, Sebastian Ramirez Alegria, Dante Minniti, Marina Kounkel, Guy Stringfellow, Rodolfo H. Barbá, Genaro Suárez

Research output: Contribution to journalArticlepeer-review


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 {km} {{{s}}}-1. 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.

Based on Vista Variables in the Vía Láctea (VVV); SDSS-IV APOGEE-2 and Gaia DR2 data.
Original languageEnglish
Article number46
JournalThe Astronomical Journal
Publication statusPublished - 1 Jul 2019


  • Galaxy: stellar content
  • infrared: stars
  • stars: massive
  • stars: Wolf–Rayet
  • stars: variables: general


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