Evidence of an evolved nature of MWC349A
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A_____%2F20%3A00534346" target="_blank" >RIV/67985815:_____/20:00534346 - isvavai.cz</a>
Result on the web
<a href="https://doi.org/10.1093/mnras/staa519" target="_blank" >https://doi.org/10.1093/mnras/staa519</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1093/mnras/staa519" target="_blank" >10.1093/mnras/staa519</a>
Alternative languages
Result language
angličtina
Original language name
Evidence of an evolved nature of MWC349A
Original language description
We collected new high-resolution near-infrared spectra in the K and L bands using the GNIRS spectrograph at Gemini-North to study the molecular disc of MWC349A, and in particular to search for other molecular species such as SiO and the isotope (CO)-C-13. The amount of (CO)-C-13, obtained from the (CO)-C-12/(CO)-C-13 ratio, is recognized as an excellent tool to discriminate between pre-main-sequence and evolved massive stars. We find no signatures of SiO band emission, but detect CO band emission with considerably lower intensity and CO gas temperature compared to previous observations. Moreover, from detailed modelling of the emission spectrum, we derive an isotope ratio of (CO)-C-12/(CO)-C-13 = 4 +/- 1. Based on this significant enrichment of the circumstellar environment in (CO)-C-13, we conclude that MWC349A belongs to the group of B[e] supergiants, and we discuss possible reasons for the drop in CO intensity.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10308 - Astronomy (including astrophysics,space science)
Result continuities
Project
<a href="/en/project/GA17-02337S" target="_blank" >GA17-02337S: Molecules in the environments of evolved massive stars</a><br>
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2020
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Monthly Notices of the Royal Astronomical Society
ISSN
1365-2966
e-ISSN
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Volume of the periodical
493
Issue of the periodical within the volume
3
Country of publishing house
GB - UNITED KINGDOM
Number of pages
7
Pages from-to
4308-4314
UT code for WoS article
000526035600087
EID of the result in the Scopus database
2-s2.0-85085397215