Molecular environment of the yellow hypergiant star HD 269953

Result code in 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>

Result on the web

<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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Result language

angličtina

Original language name

Molecular environment of the yellow hypergiant star HD 269953

Original language description

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.

Czech name

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Czech description

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Type

J_ost - Miscellaneous article in a specialist periodical

CEP classification

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OECD FORD branch

10308 - Astronomy (including astrophysics,space science)

Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2022

Confidentiality

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

Name of the periodical

Boletín de la Asociación Argentina de Astronomía

ISSN

1669-9521

e-ISSN

1669-9521

Volume of the periodical

63

Issue of the periodical within the volume

July

Country of publishing house

AR - ARGENTINA

Number of pages

3

Pages from-to

65-67

UT code for WoS article

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EID of the result in the Scopus database

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