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53 papers
A Detailed Spectroscopic Study of the WN6ha + O5 Colliding-wind Binary WR 25
Eric Gosset, Roberto Gamen, Laurent Mahy +3
Massive stars have a major impact on their environment in their host galaxy. Observational determinations of their physical parameters are required to better constrain evolutionary…
The YMDB catalog: Young massive detached binaries for the determination of high-precision absolute stellar parameters
Pablo Martín-Ravelo, Roberto Gamen, Julia I. Arias +2
Massive stars play a crucial role in the cosmic dynamics and chemical evolution of galaxies, however our understanding of their evolution and properties remains limited. An accurat…
Probing the early Milky Way with GHOST spectra of an extremely metal-poor star in the Galactic disk
Anya Dovgal, Kim A. Venn, Federico Sestito +31
Pristine_183.6849+04.8619 (P1836849) is an extremely metal-poor ([Fe/H]) star on a prograde orbit confined to the Galactic disk. Such stars are rare and may have their…
Time series photometry and multi-wavelength characterisation of the young stellar cluster Mon R2
Santiago Orcajo, Lucas A. Cieza, Roberto Gamen
Using the Las Cumbres Observatory Global Telescope Network (LCOGT), we have obtained multi-epoch photometry of the young cluster Mon R2. We have monitored over 6000 sources with $i…
Fundamental parameters of the massive eclipsing binary HM1 8
Cinthya N. Rodríguez, Gabriel A. Ferrero, Omar G. Benvenuto +5
We present a comprehensive study of the massive binary system HM1~8, based on multi-epoch high resolution spectroscopy, -band photometry and archival X-ray data. Spectra from th…
The winking eye of a very massive star: WR 21a revealed as an eclipsing binary by TESS
Rodolfo H. Barbá, Roberto C. Gamen, Pablo Martín-Ravelo +2
WR~21a was known as a massive spectroscopic binary composed of an O2.5 If*/WN6ha primary and an O3 V((f*))z secondary. Although a minimum value, the mass estimated for the primary…