The infrared view of dust and molecules around V4334 Sgr (Sakurai's object): a 20-yr retrospective

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A_____%2F20%3A00533953" target="_blank" >RIV/67985815:_____/20:00533953 - isvavai.cz</a>

Result on the web

<a href="https://doi.org/10.1093/mnras/staa343" target="_blank" >https://doi.org/10.1093/mnras/staa343</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1093/mnras/staa343" target="_blank" >10.1093/mnras/staa343</a>

Result language

angličtina

Original language name

The infrared view of dust and molecules around V4334 Sgr (Sakurai's object): a 20-yr retrospective

Original language description

We present an analysis of the evolution of circumstellar dust and molecules in the environment of the very late thermal pulse object V4334 Sgr (Sakurai's object) over an similar to 20-yr period, drawing on ground-, airborne-, and space-based infrared photometry and spectroscopy. The dust emission, which started in 1997, resembles a blackbody that cooled from similar to 1200 K in 1998 August to similar to 180 K in 2016 July, The dust mass, assuming amorphous carbon, was similar to 5 x 10(-10) M-circle dot in 1998 August, and we estimate that the total dust mass was similar to 2 x 10(-5) M-circle dot by similar to 2016, The appearance of a near-infrared excess in 2008 suggests that a new episode of (or renewed) mass-loss began then, We infer lower limits on the bolometric luminosity of the embedded star from that of the dust shell, which rose to similar to 16 000 L-circle dot before declining to similar to 3000 L-circle dot. There is evidence for weak 6-7 mu m absorption, which we attribute to hydrogenated amorphous carbon formed in material ejected by Sakurai's object during a mass ejection phase that preceded the 1997 event, We detect small hydrocarbon and other molecules in the spectra, and trace the column densities in hydrogen cyanide (HCN) and acetylene (C2H2). We use the former to determine the C-12/C-13 ratio to be 6.4 +/- 0.7, 14 times smaller than the Solar system value.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10308 - Astronomy (including astrophysics,space science)

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

Publication year

2020

Confidentiality

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

Name of the periodical

Monthly Notices of the Royal Astronomical Society

ISSN

1365-2966

e-ISSN

—

Volume of the periodical

493

Issue of the periodical within the volume

1

Country of publishing house

GB - UNITED KINGDOM

Number of pages

15

Pages from-to

1277-1291

UT code for WoS article

000518156100092

EID of the result in the Scopus database

2-s2.0-85091601193