Optimised use of interferometry, spectroscopy, and stellar atmosphere models for determining the fundamental parameters of stars Article Swipe
Nayeem Ebrahimkutty
,
Matthew Raymond Gent
,
D. Mourard
,
A. Domiciano de Souza
,
M. Bergemann
,
T. Morel
,
Giuseppe Morello
,
N. Nardetto
,
B. Plez
·
YOU?
·
· 2024
· Open Access
·
· DOI: https://doi.org/10.1051/0004-6361/202450105
YOU?
·
· 2024
· Open Access
·
· DOI: https://doi.org/10.1051/0004-6361/202450105
Context . Thanks to recent progress in the field of optical interferometry, instrument sensitivities have now reached the level achieved in the domain of new space missions dedicated to exoplanet and stellar studies. Combining interferometry with other observational approaches enables the determination of stellar parameters and helps improve our understanding of stellar physics. Aims . In this paper, we aim to demonstrate a new way of using stellar atmosphere models for a joint interpretation of spectroscopic and interferometric observations. Methods . Starting from a discrete grid of one-dimensional (1D) stellar atmosphere models, we developed a training algorithm, based on an artificial neural network, capable of estimating the spectrum and intensity profile of a star over a range of wavelengths and viewing angles. A minimisation algorithm based on the trained function allowed for the simultaneous fitting of the observational spectrum and interferometric complex visibilities. As a result, coherent and precise stellar parameters can be extracted. Results . We show the ability of the trained function to match the modelled intensity profiles of stars in the effective temperature range of 4500–7000 K and surface gravity range of 3 to 5 dex, with a relative precision to the model that is better than 0.05%. Using simulated interferometric data and actual spectroscopic measurements, we demonstrated the performance of our algorithm on a sample of five benchmark stars. Using this method, we achieved an accuracy within 0.5% for the angular diameter, radius, and surface gravity, and within 20 K for the effective temperature. Conclusions . This paper demonstrates a new method of using interferometric data combined with spectroscopic observations. This approach offers an improved determination of the radius, effective temperature, and surface gravity of stars.
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- Type
- article
- Language
- en
- Landing Page
- https://doi.org/10.1051/0004-6361/202450105
- OA Status
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- References
- 51
- Related Works
- 10
- OpenAlex ID
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All OpenAlex metadata
Raw OpenAlex JSON
- OpenAlex ID
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https://openalex.org/W4403464499Canonical identifier for this work in OpenAlex
- DOI
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https://doi.org/10.1051/0004-6361/202450105Digital Object Identifier
- Title
-
Optimised use of interferometry, spectroscopy, and stellar atmosphere models for determining the fundamental parameters of starsWork title
- Type
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articleOpenAlex work type
- Language
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enPrimary language
- Publication year
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2024Year of publication
- Publication date
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2024-10-16Full publication date if available
- Authors
-
Nayeem Ebrahimkutty, Matthew Raymond Gent, D. Mourard, A. Domiciano de Souza, M. Bergemann, T. Morel, Giuseppe Morello, N. Nardetto, B. PlezList of authors in order
- Landing page
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https://doi.org/10.1051/0004-6361/202450105Publisher landing page
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YesWhether a free full text is available
- OA status
-
hybridOpen access status per OpenAlex
- OA URL
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https://doi.org/10.1051/0004-6361/202450105Direct OA link when available
- Concepts
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Physics, Stellar atmosphere, Astrophysics, Stars, Interferometry, Atmosphere (unit), Spectroscopy, Astronomy, MeteorologyTop concepts (fields/topics) attached by OpenAlex
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0Total citation count in OpenAlex
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51Number of works referenced by this work
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10Other works algorithmically related by OpenAlex
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