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Masses of the components of SB2 binaries observed with Gaia. II. Masses derived from PIONIER interferometric observations for Gaia validation
J. -L. Halbwachs, H. M. J. Boffin, J. -B. Le Bouquin +15
In anticipation of the Gaia astrometric mission, a sample of spectroscopic binaries is being observed since 2010 with the Sophie spectrograph at the Haute--Provence Observatory. Ou…
The mass of the very massive binary WR21a
F. Tramper, H. Sana, N. E. Fitzsimons +4
We present multi-epoch spectroscopic observations of the massive binary system WR21a, which include the January 2011 periastron passage. Our spectra reveal multiple SB2 lines and f…
Broad Balmer Wings in BA Hyper/Supergiants Distorted by Diffuse Interstellar Bands: Five Examples in the 30 Doradus Region from the VLT-FLAMES Tarantula Survey
Nolan R. Walborn, Hugues Sana, Christopher J. Evans +11
Extremely broad emission wings at H and H have been found in VFTS data for five very luminous BA supergiants in or near 30 Doradus in the Large Magellanic Cloud. The profiles…
HST astrometry in the 30 Doradus region: measuring proper motions of individual stars in the Large Magellanic Cloud
I. Platais, R. P. van der Marel, D. J. Lennon +5
We present measurements of positions and relative proper motions in the 30 Doradus region of the Large Magellanic Cloud (LMC). We detail the construction of a single-epoch astromet…
Molecfit: A general tool for telluric absorption correction II. Quantitative evaluation on ESO-VLT X-Shooter spectra
W. Kausch, S. Noll. A. Smette, S. Kimeswenger +6
Context: Absorption by molecules in the Earth's atmosphere strongly affects ground-based astronomical observations. The resulting absorption line strength and shape depend on the h…
Molecfit: A general tool for telluric absorption correction. I. Method and application to ESO instruments
A. Smette, H. Sana, S. Noll +10
Context: The interaction of the light from astronomical objects with the constituents of the Earth's atmosphere leads to the formation of telluric absorption lines in ground-based…