About: Ultraviolet and visual flux and line variations of one of the least variable Bp stars HD 64740

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About: Ultraviolet and visual flux and line variations of one of the least variable Bp stars HD 64740 Goto Sponge NotDistinct Permalink

An Entity of Type : http://linked.opendata.cz/ontology/domain/vavai/Vysledek, within Data Space : linked.opendata.cz associated with source document(s)

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rdf:type	skos:Concept http://linked.opendata.cz/ontology/domain/vavai/Vysledek
Description	The light variability of hot magnetic chemically peculiar stars is typically caused by the flux redistribution in spots with peculiar abundance. This raises the question why some stars with surface abundance spots show significant rotational light variability, while others do not. Aims: We study the Bp star HD 64740 to investigate how its remarkable inhomogeneities in the surface distribution of helium and silicon, and the corresponding strong variability of many spectral lines, can result in one of the faintest photometric variabilities among the Bp stars. Methods: We used model atmospheres and synthetic spectra calculated for the silicon and helium abundances from surface abundance maps to predict the ultraviolet and visual light and line variability of HD 64740. The predicted fluxes and line profiles were compared with the observed ones derived with the IUE, HST, and Hipparcos satellites and with spectra acquired using the FEROS spectrograph at the 2.2 m MPG/ESO telescope in La Silla. The light variability of hot magnetic chemically peculiar stars is typically caused by the flux redistribution in spots with peculiar abundance. This raises the question why some stars with surface abundance spots show significant rotational light variability, while others do not. Aims: We study the Bp star HD 64740 to investigate how its remarkable inhomogeneities in the surface distribution of helium and silicon, and the corresponding strong variability of many spectral lines, can result in one of the faintest photometric variabilities among the Bp stars. Methods: We used model atmospheres and synthetic spectra calculated for the silicon and helium abundances from surface abundance maps to predict the ultraviolet and visual light and line variability of HD 64740. The predicted fluxes and line profiles were compared with the observed ones derived with the IUE, HST, and Hipparcos satellites and with spectra acquired using the FEROS spectrograph at the 2.2 m MPG/ESO telescope in La Silla. (en)
Title	Ultraviolet and visual flux and line variations of one of the least variable Bp stars HD 64740 Ultraviolet and visual flux and line variations of one of the least variable Bp stars HD 64740 (en)
skos:prefLabel	Ultraviolet and visual flux and line variations of one of the least variable Bp stars HD 64740 Ultraviolet and visual flux and line variations of one of the least variable Bp stars HD 64740 (en)
skos:notation	RIV/00216224:14310/13:00066262!RIV14-MSM-14310___
http://linked.open...avai/riv/aktivita	P S
http://linked.open...avai/riv/aktivity	P(GAP209/12/0217), S
http://linked.open...iv/cisloPeriodika	léto
http://linked.open...vai/riv/dodaniDat	2014
http://linked.open...aciTvurceVysledku	Prvák, Milan Janík, Jan Skarka, Marek Mikulášek, Zdeněk Krtička, Jiří Marková, Hana
http://linked.open.../riv/druhVysledku	J - Článek v odborném periodiku
http://linked.open...iv/duvernostUdaju	S - Úplné a pravdivé údaje nepodléhající ochraně podle zvláštních právních předpisů
http://linked.open...titaPredkladatele	Masarykova univerzita / Přírodovědecká fakulta
http://linked.open...dnocenehoVysledku	112479
http://linked.open...ai/riv/idVysledku	RIV/00216224:14310/13:00066262
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	stars: chemically peculiar; stars: early-type; stars: variables: general; stars: winds; outflows; ultraviolet: stars; stars: individual: HD 64740 (en)
http://linked.open.../riv/klicoveSlovo	outflows stars: early-type stars: chemically peculiar stars: individual: HD 64740 stars: winds ultraviolet: stars stars: variables: general
http://linked.open...odStatuVydavatele	FR - Francouzská republika
http://linked.open...ontrolniKodProRIV	[434C4C881EB7]
http://linked.open...i/riv/nazevZdroje	Astronomy and Astrophysics
http://linked.open...in/vavai/riv/obor	BN
http://linked.open...ichTvurcuVysledku	6 (xsd:int)
http://linked.open...cetTvurcuVysledku	7 (xsd:int)
http://linked.open...vavai/riv/projekt	Multispectral variability of hot stars and its nature
http://linked.open...UplatneniVysledku	2013
http://linked.open...v/svazekPeriodika	556
http://linked.open...iv/tvurceVysledku	Janík, Jan Marková, Hana Mikulášek, Zdeněk Krtička, Jiří Zverko, Juraj Skarka, Marek Prvák, Milan
http://linked.open...ain/vavai/riv/wos	000323893500018
issn	0004-6361
number of pages	11 (xsd:int)
http://bibframe.org/vocab/doi	10.1051/0004-6361/201221018
http://localhost/t...ganizacniJednotka	14310

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