| Issue |
A&A
Volume 686, June 2024
|
|
|---|---|---|
| Article Number | A222 | |
| Number of page(s) | 17 | |
| Section | Interstellar and circumstellar matter | |
| DOI | https://doi.org/10.1051/0004-6361/202347661 | |
| Published online | 14 June 2024 | |
Infrared colours and bolometric corrections of SiO masing stars in the inner Milky Way
1
Dipartimento di Fisica e Astronomia “Augusto Righi”, Alma Mater Studiorum, Università di Bologna,
Via Gobetti 93/2,
40129
Bologna,
Italy
e-mail: maria.messineo2@unibo.it
2
INAF – Osservatorio di Astrofisica e Scienza dello Spazio di Bologna,
Via Gobetti 93/3,
40129
Bologna,
Italy
Received:
5
August
2023
Accepted:
20
March
2024
Aims. We analysed a sample of SiO-masing late-type stars located in the inner Galaxy with the goal of setting better constraints on their obscuration.
Methods. This reference sample has allowed us to define mathematical relations between their dereddened infrared colours and the observed colours (e.g. Ks-[8], Ks-[24]).
Results. The derived equations define a property (the locus) of these late-type stars. Therefore, they enable us to derive the interstellar extinction. With estimated spectral types, it is possible to decompose the total extinction in the two components (interstellar and envelope extinction).
Conclusions. These relations are useful for classifying extremely obscured late-type stars located in the inner Galaxy. Estimating the two extinction components can be performed on an individual late-type star, independently of its surroundings and even when few mid-infrared measurements are available.
Key words: methods: data analysis / circumstellar matter / stars: late-type / Galaxy: stellar content / infrared: stars
© The Authors 2024
Open Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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