Stars with discrepant v sin i as derived from Ca II 3933 A and Mg II 4481 A lines. III. Stars with v sin i (3933 A) < v sin i (4481 A)

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216224%3A14310%2F13%3A00067865" target="_blank" >RIV/00216224:14310/13:00067865 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1134/S1990341313010069" target="_blank" >http://dx.doi.org/10.1134/S1990341313010069</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1134/S1990341313010069" target="_blank" >10.1134/S1990341313010069</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Stars with discrepant v sin i as derived from Ca II 3933 A and Mg II 4481 A lines. III. Stars with v sin i (3933 A) < v sin i (4481 A)

Popis výsledku v původním jazyce

Axial rotation of a star plays an important role in its evolution, physical conditions in its atmosphere and the appearance of its spectrum. We analyzed CCD spectra of nine stars for which the projected rotational velocity derived from the Ca II line at3933 A was remarkably lower than the one derived from the MgII line at 4481 A. We derived effective temperatures and surface gravities using published uvbybeta photometries, and computed synthetic spectra. Comparing the observed line profiles of the twolines with the computed ones, we estimated the values of v sin i. One of the stars, HD 44783, is a Be-star which, besides the narrow absorptions in the spectrum originating in its circumstellar envelope, also has lines of interstellar origin. We also found indications of circumstellar matter in the spectrum of HD 25152. In the spectra of the remaining seven stars the narrow components in the Ca II 3933 A line as well as narrow absorptions in the Na I 5889.951 A (D1) and 5895.

Název v anglickém jazyce

Stars with discrepant v sin i as derived from Ca II 3933 A and Mg II 4481 A lines. III. Stars with v sin i (3933 A) < v sin i (4481 A)

Popis výsledku anglicky

Axial rotation of a star plays an important role in its evolution, physical conditions in its atmosphere and the appearance of its spectrum. We analyzed CCD spectra of nine stars for which the projected rotational velocity derived from the Ca II line at3933 A was remarkably lower than the one derived from the MgII line at 4481 A. We derived effective temperatures and surface gravities using published uvbybeta photometries, and computed synthetic spectra. Comparing the observed line profiles of the twolines with the computed ones, we estimated the values of v sin i. One of the stars, HD 44783, is a Be-star which, besides the narrow absorptions in the spectrum originating in its circumstellar envelope, also has lines of interstellar origin. We also found indications of circumstellar matter in the spectrum of HD 25152. In the spectra of the remaining seven stars the narrow components in the Ca II 3933 A line as well as narrow absorptions in the Na I 5889.951 A (D1) and 5895.

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

BN - Astronomie a nebeská mechanika, astrofyzika

OECD FORD obor

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Projekt

—

Návaznosti

S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2013

Kód důvěrnosti údajů

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

Název periodika

Astrophysical Bulletin

ISSN

1990-3413

e-ISSN

—

Svazek periodika

68

Číslo periodika v rámci svazku

1

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

21

Strana od-do

57-77

Kód UT WoS článku

000315445200006

EID výsledku v databázi Scopus

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