Hot stars are the main source of ionization of the interstellar medium and its enrichment due to heavy elements. Constraining the physical conditions of their environments is crucial to understand how these stars evolve and their impact on the evolution of galaxies.Spectroscopy allows to access the physics, the chemistry, and the dynamics of...
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November 23, 2020 (v1)PublicationUploaded on: December 4, 2022
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October 3, 2016 (v1)Conference paper
We analysed O giants through UV and optical spectroscopy using the code CMFGEN. We conclude that these stars show weak winds and are at the transition region in luminosity for such issue.
Uploaded on: December 3, 2022 -
August 1, 2019 (v1)Journal article
Aims. Analyses of Galactic late O dwarfs (O8-O9.5V stars) raised the "weak wind problem": spectroscopic mass loss rates (˙ M) are up to two orders of magnitude lower than the theoretical values. We investigated the stellar and wind properties of Galactic late O giants (O8-O9.5III stars). These stars have luminosities log(L /L) ≈ 5.2, this is...
Uploaded on: December 4, 2022 -
February 27, 2020 (v1)Journal article
We present intensity interferometry of the luminous blue variable P Cyg in the light of its H$\alpha$ emission performed with 1 m-class telescopes. We compare the measured visibility points to synthesized interferometric data based on the CMFGEN physical modeling of a high-resolution spectrum of P Cyg recorded almost simultaneously with our...
Uploaded on: December 4, 2022 -
January 17, 2022 (v1)Journal article
Differential Interferometry allows to obtain the differential visibility and phase, in addition to the spectrum. The differential phase contains important information about the structure and motion of stellar photosphere such as stellar spots and non-radial pulsations, and particularly the rotation. Thus, this interferometric observable...
Uploaded on: December 3, 2022 -
September 1, 2022 (v1)Journal article
In this paper we report on spatial intensity interferometry measurements within the H$\alpha$ line on two stars: the Luminous Blue Variable supergiant P Cygni, and the late-type B supergiant Rigel. The experimental setup was upgraded to allow simultaneous measurement of two polarization channels, instead of one in our previous setup, and the...
Uploaded on: December 3, 2022 -
April 28, 2020 (v1)Journal article
Aims. We present a detailed visible and near-infrared spectro-interferometric analysis of the Be-shell star o Aquarii from quasi-contemporaneous CHARA/VEGA and VLTI/AMBER observations.Methods. We analyzed spectro-interferometric data in the Hα (VEGA) and Brγ (AMBER) lines using models of increasing complexity: simple geometric models, kinematic...
Uploaded on: December 4, 2022 -
June 7, 2021 (v1)Conference paper
We present our project on the revival of intensity interferometry with modern photonic technologies, and more specifically with conventional optical telescopes. This original approach is complementary to the work currently done aiming at applying intensity interferometry to Cherenkov telescopes. We briefly summarize the results obtained so far.
Uploaded on: December 3, 2022