Molecular environment of the yellow hypergiant star HD 269953

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A_____%2F22%3A00562137" target="_blank" >RIV/67985815:_____/22:00562137 - isvavai.cz</a>

Výsledek na webu

<a href="http://www.astronomiaargentina.org.ar/b63/2022BAAA...63...65K.pdf" target="_blank" >http://www.astronomiaargentina.org.ar/b63/2022BAAA...63...65K.pdf</a>

DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Molecular environment of the yellow hypergiant star HD 269953

Popis výsledku v původním jazyce

Yellow hypergiants are massive stars, most likely in post-red supergiant evolutionary state. Stars in this phase can undergo multiple outbursts, and the ejected material might enshroud the stars in gaseous and dusty shells or envelopes. The object HD 269953 has been suggested to be a candidate yellow hypergiant. Although no historic outburst has been reported for that object, its environment hosts a substantial amount of warm CO gas. To unveil the dynamics within the molecular gas we obtained a high-resolution (R∼ 45,000) K-band spectrum of HD 269953 with IGRINS at GEMINI-South. We find that the spectrum is rich in emission features. In particular, we detect emission from the 12CO and 13CO molecular bands. The latter is strongly enriched, in agreement with the hypothesis that the environment contains processed matter that has been released from an evolved object. Moreover, we identified emission of hot water vapor, which is, to our knowledge, the first detection of water in the vicinity of an evolved massive star. The results from our analysis suggest that the CO gas is confined in a ring that rotates with a velocity of 9± 0.5 km s-1, projected to the line of sight. No rotational broadening is seen in the lines of water vapor, and their temperature is about 400 K cooler than that of the CO bands implying that the line-formation region of water vapor is located slightly farther away from the star than the CO ring.

Název v anglickém jazyce

Molecular environment of the yellow hypergiant star HD 269953

Popis výsledku anglicky

Yellow hypergiants are massive stars, most likely in post-red supergiant evolutionary state. Stars in this phase can undergo multiple outbursts, and the ejected material might enshroud the stars in gaseous and dusty shells or envelopes. The object HD 269953 has been suggested to be a candidate yellow hypergiant. Although no historic outburst has been reported for that object, its environment hosts a substantial amount of warm CO gas. To unveil the dynamics within the molecular gas we obtained a high-resolution (R∼ 45,000) K-band spectrum of HD 269953 with IGRINS at GEMINI-South. We find that the spectrum is rich in emission features. In particular, we detect emission from the 12CO and 13CO molecular bands. The latter is strongly enriched, in agreement with the hypothesis that the environment contains processed matter that has been released from an evolved object. Moreover, we identified emission of hot water vapor, which is, to our knowledge, the first detection of water in the vicinity of an evolved massive star. The results from our analysis suggest that the CO gas is confined in a ring that rotates with a velocity of 9± 0.5 km s-1, projected to the line of sight. No rotational broadening is seen in the lines of water vapor, and their temperature is about 400 K cooler than that of the CO bands implying that the line-formation region of water vapor is located slightly farther away from the star than the CO ring.

Druh

J_ost - Ostatní články v recenzovaných periodicích

CEP obor

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OECD FORD obor

10308 - Astronomy (including astrophysics,space science)

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2022

Kód důvěrnosti údajů

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

Název periodika

Boletín de la Asociación Argentina de Astronomía

ISSN

1669-9521

e-ISSN

1669-9521

Svazek periodika

63

Číslo periodika v rámci svazku

July

Stát vydavatele periodika

AR - Argentinská republika

Počet stran výsledku

3

Strana od-do

65-67

Kód UT WoS článku

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EID výsledku v databázi Scopus

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