An ultraviolet study of B[e] stars: evidence for pulsations,
luminous blue variable type variations and processes in
envelopes

J 2018

An ultraviolet study of B[e] stars: evidence for pulsations, luminous blue variable type variations and processes in envelopes

KRTIČKOVÁ, Iva a Jiří KRTIČKA

Základní údaje

Originální název

An ultraviolet study of B[e] stars: evidence for pulsations, luminous blue variable type variations and processes in envelopes

Autoři

KRTIČKOVÁ, Iva a Jiří KRTIČKA

Vydání

Monthly Notices of the Royal Astronomical Society, MALDEN, WILEY, 2018, 0035-8711

Další údaje

Jazyk

angličtina

Typ výsledku

Článek v odborném periodiku

Obor

10308 Astronomy

Stát vydavatele

Velká Británie a Severní Irsko

Utajení

není předmětem státního či obchodního tajemství

Odkazy

URL

Impakt faktor

Impact factor: 5.231

Označené pro přenos do RIV

Ano

Kód RIV

RIV/00216224:14310/18:00101126

Organizační jednotka

Přírodovědecká fakulta

Klíčová slova anglicky

stars: early-type stars: emission-line; Be; stars: oscillations; stars: variables: general; stars: winds; outflows

Příznaky

Mezinárodní význam, Recenzováno

Změněno: 23. 4. 2024 12:25, Mgr. Michal Petr

Anotace

V originále

Stars that exhibit a B[e] phenomenon comprise a very diverse group of objects in a different evolutionary status. These objects show common spectral characteristics, including the presence of Balmer lines in emission, forbidden lines and strong infrared excess due to dust. Observations of emission lines indicate illumination by an ultraviolet ionizing source, which is key to understanding the elusive nature of these objects. We study the ultraviolet variability of many B[e] stars to specify the geometry of the circumstellar environment and its variability. We analyse massive hot B[e] stars from our Galaxy and from the Magellanic Clouds. We study the ultraviolet broad-band variability derived from the flux-calibrated data. We determine variations of individual lines and the correlation with the total flux variability. We detected variability of the spectral energy distribution and of the line profiles. The variability has several sources of origin, including light absorption by the disc, pulsations, luminous blue variable type variations, and eclipses in the case of binaries. The stellar radiation of most of B[e] stars is heavily obscured by circumstellar material. This suggests that the circumstellar material is present not only in the disc but also above its plane. The flux and line variability is consistent with a two-component model of a circumstellar environment composed of a dense disc and an ionized envelope. Observations of B[e] supergiants show that many of these stars have nearly the same luminosity, about 1.9 x 10^5 Lo, and similar effective temperatures.

Návaznosti

GA16-01116S, projekt VaV

Název: Atmosféry a okolohvězdné prostředí magnetických horkých hvězd

Investor: Grantová agentura ČR, Atmosféry a okolohvězdné prostředí magnetických horkých hvězd

Citovat

KRTIČKOVÁ, Iva a Jiří KRTIČKA. An ultraviolet study of B[e] stars: evidence for pulsations, luminous blue variable type variations and processes in envelopes. Monthly Notices of the Royal Astronomical Society. MALDEN: WILEY, 2018, roč. 477, č. 1, s. 236-253. ISSN 0035-8711. Dostupné z: https://doi.org/10.1093/mnras/sty749.

@article{1431379,
   author = {Krtičková, Iva and Krtička, Jiří},
   article_location = {MALDEN},
   article_number = {1},
   doi = {https://doi.org/10.1093/mnras/sty749},
   keywords = {stars: early-type stars: emission-line; Be; stars: oscillations; stars: variables: general; stars: winds; outflows},
   language = {eng},
   issn = {0035-8711},
   journal = {Monthly Notices of the Royal Astronomical Society},
   title = {An ultraviolet study of B[e] stars: evidence for pulsations, luminous blue variable type variations and processes in envelopes},
   url = {http://dx.doi.org/10.1093/mnras/sty749},
   volume = {477},
   year = {2018}
}

TY  - JOUR
ID  - 1431379
AU  - Krtičková, Iva - Krtička, Jiří
PY  - 2018
TI  - An ultraviolet study of B[e] stars: evidence for pulsations, luminous blue variable type variations and processes in envelopes
JF  - Monthly Notices of the Royal Astronomical Society
VL  - 477
IS  - 1
SP  - 236-253
EP  - 236-253
PB  - WILEY
SN  - 00358711
KW  - stars: early-type stars: emission-line
KW  - Be
KW  - stars: oscillations
KW  - stars: variables: general
KW  - stars: winds
KW  - outflows
UR  - http://dx.doi.org/10.1093/mnras/sty749
N2  - Stars that exhibit a B[e] phenomenon comprise a very diverse group of objects in a different evolutionary status. These objects show common spectral characteristics, including the presence of Balmer lines in emission, forbidden lines and strong infrared excess due to dust. Observations of emission lines indicate illumination by an ultraviolet ionizing source, which is key to understanding the elusive nature of these objects. We study the ultraviolet variability of many B[e] stars to specify the geometry of the circumstellar environment and its variability. We analyse massive hot B[e] stars from our Galaxy and from the Magellanic Clouds. We study the ultraviolet broad-band variability derived from the flux-calibrated data. We determine variations of individual lines and the correlation with the total flux variability. We detected variability of the spectral energy distribution and of the line profiles. The variability has several sources of origin, including light absorption by the disc, pulsations, luminous blue variable type variations, and eclipses in the case of binaries. The stellar radiation of most of B[e] stars is heavily obscured by circumstellar material. This suggests that the circumstellar material is present not only in the disc but also above its plane. The flux and line variability is consistent with a two-component model of a circumstellar environment composed of a dense disc and an ionized envelope. Observations of B[e] supergiants show that many of these stars have nearly the same luminosity, about 1.9 x 10^5 Lo, and similar effective temperatures.
ER  -

KRTIČKOVÁ, Iva a Jiří KRTIČKA. An ultraviolet study of B[e] stars: evidence for pulsations, luminous blue variable type variations and processes in envelopes. \textit{Monthly Notices of the Royal Astronomical Society}. MALDEN: WILEY, 2018, roč.~477, č.~1, s.~236-253. ISSN~0035-8711. Dostupné z: https://doi.org/10.1093/mnras/sty749.

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