Evidence of an evolved nature of MWC349A

Kód výsledku v 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>

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

Evidence of an evolved nature of MWC349A

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

Evidence of an evolved nature of MWC349A

Popis výsledku anglicky

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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10308 - Astronomy (including astrophysics,space science)

Projekt

<a href="/cs/project/GA17-02337S" target="_blank" >GA17-02337S: Molekuly v prostředí vyvinutých masivních hvězd</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2020

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Monthly Notices of the Royal Astronomical Society

ISSN

1365-2966

e-ISSN

—

Svazek periodika

493

Číslo periodika v rámci svazku

3

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

7

Strana od-do

4308-4314

Kód UT WoS článku

000526035600087

EID výsledku v databázi Scopus

2-s2.0-85085397215