| Autor: |
Koumpia, Evgenia, Koutoulaki, M, de Wit, W-J, Oudmaijer, R D, Frost, A J, Lumsden, S L, Pittard, J M |
| Předmět: |
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| Zdroj: |
Monthly Notices of the Royal Astronomical Society: Letters; Feb2023, Vol. 519 Issue 1, pL51-L56, 6p |
| Abstrakt: |
With steady observational advances, the formation of massive stars is being understood in more detail. Numerical models are converging on a scenario where accretion discs play a key role. Direct observational evidence of such discs at a few au scales is scarce, due to the rarity of such objects and the observational challenges, including the lack of adequate diagnostic lines in the near-IR. We present the analysis of K -band spectro-interferometric observations toward the Massive Young Stellar Object IRAS 13481-6124, which is known to host an accreting dusty disc. Using GRAVITY on the VLTI, we trace the crucial au-scales of the warm inner interface between the star and the accretion dusty disc. We detect and spatially resolve the Na i doublet and He i transitions towards an object of this class for the first time. The new observations in combination with our geometric models allowed us to probe the smallest au-scales of accretion/ejection around a MYSO. We find that Na i originates in the disc at smaller radii than the dust disc and is more compact than any of the other spatially resolved diagnostics (Brγ, He i , and CO). Our findings suggest that Na i can be a new powerful diagnostic line in tracing the warm star/disc accreting interface of forming (massive) stars, while the similarities between He i and Brγ point towards an accretion/ejection origin of He i. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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