Line profile variability in B supergiants

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A_____%2F17%3A00485367" target="_blank" >RIV/67985815:_____/17:00485367 - isvavai.cz</a>

Result on the web

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DOI - Digital Object Identifier

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Result language

angličtina

Original language name

Line profile variability in B supergiants

Original language description

Many B-type supergiants are reported to show both spectroscopic and photometric variability. In addition, their line profiles show an excess broadening, typically referred to as macroturbulence. While the cause for these variabilities and the macroturbulence are not clear yet, pulsations seem to play an important role. They influence the measured radial velocity, width and shape of photospheric lines. We study a sample of Galactic B-type supergiants based on high-quality spectroscopic data. Applying the moment method to selected atmospheric absorption lines, we find that the line profile variability in our objects is caused by pulsations. In addition, H.alpha. displays strong, often night-to-night variability, suggesting time-variable stellar winds. The photospheric lines show large contributions of macroturbulent broadening, which render it difficult to determine proper values of the projected rotational velocities.

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

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2017

Confidentiality

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

Name of the periodical

Publications of the Astronomical Observatory of Belgrade

ISSN

0373-3742

e-ISSN

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Volume of the periodical

96

Issue of the periodical within the volume

1

Country of publishing house

RS - THE REPUBLIC OF SERBIA

Number of pages

6

Pages from-to

161-166

UT code for WoS article

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EID of the result in the Scopus database

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