About: The nature of the light variability of the silicon star HR 7224

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rdf:type	skos:Concept http://linked.opendata.cz/ontology/domain/vavai/Vysledek
Description	Although photometric variations of CP stars are frequently used to determine their rotational periods, the detailed mechanism of their light variability remains poorly understood. We simulate the light variability of HR 7224 using the observed surface distribution of Si and Fe. We calculated for the appropriate Si and Fe abundances to obtain the emergent flux and to predict the rotationally modulated light curve of the star. We also obtained additional photometric measurements. We show that the silicon b-f transitions and iron b-b transitions provide the main contribution to the flux redistribution, although an additional source of opacity is needed. We confirm that numerous iron lines significantly contribute to the well-known depression at 5200 A and discuss the connection between iron abundance and the value of peculiarity index a. The uneven surface distribution of silicon and iron is able to explain most of the rotationally modulated light variation in the star HR 7224. Although photometric variations of CP stars are frequently used to determine their rotational periods, the detailed mechanism of their light variability remains poorly understood. We simulate the light variability of HR 7224 using the observed surface distribution of Si and Fe. We calculated for the appropriate Si and Fe abundances to obtain the emergent flux and to predict the rotationally modulated light curve of the star. We also obtained additional photometric measurements. We show that the silicon b-f transitions and iron b-b transitions provide the main contribution to the flux redistribution, although an additional source of opacity is needed. We confirm that numerous iron lines significantly contribute to the well-known depression at 5200 A and discuss the connection between iron abundance and the value of peculiarity index a. The uneven surface distribution of silicon and iron is able to explain most of the rotationally modulated light variation in the star HR 7224. (en)
Title	The nature of the light variability of the silicon star HR 7224 The nature of the light variability of the silicon star HR 7224 (en)
skos:prefLabel	The nature of the light variability of the silicon star HR 7224 The nature of the light variability of the silicon star HR 7224 (en)
skos:notation	RIV/00216224:14310/09:00029306!RIV10-MSM-14310___
http://linked.open...avai/riv/aktivita	P S
http://linked.open...avai/riv/aktivity	P(GA205/06/0217), P(GA205/07/0031), P(GD205/08/H005), P(MEB060807), P(MEB080832), S
http://linked.open...iv/cisloPeriodika	499
http://linked.open...vai/riv/dodaniDat	2010
http://linked.open...aciTvurceVysledku	Skalický, Jan Zvěřina, Pavel Mikulášek, Zdeněk Krtička, Jiří
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	328634
http://linked.open...ai/riv/idVysledku	RIV/00216224:14310/09:00029306
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	stars: chemically peculiar -- stars: early type -- stars: variables: general -- stars: individual: HR 7224 (en)
http://linked.open.../riv/klicoveSlovo	stars: chemically peculiar -- stars: early type -- stars: variables: general -- stars: individual: HR 7224
http://linked.open...odStatuVydavatele	FR - Francouzská republika
http://linked.open...ontrolniKodProRIV	[5FD3D3031978]
http://linked.open...i/riv/nazevZdroje	Astronomy and Astrophysics
http://linked.open...in/vavai/riv/obor	BN
http://linked.open...ichTvurcuVysledku	4 (xsd:int)
http://linked.open...cetTvurcuVysledku	7 (xsd:int)
http://linked.open...vavai/riv/projekt	Magnetic stars - laboratories of stellar physics Physics of Sun, stars, and stellar systems New approaches to variable stars data processing and interpretation Spectral energy distribution in chemically peculiar stars and its variability Stellar winds of first stars in the Universe
http://linked.open...UplatneniVysledku	2009
http://linked.open...v/svazekPeriodika	37
http://linked.open...iv/tvurceVysledku	Mikulášek, Zdeněk Zvěřina, Pavel Krtička, Jiří Zverko, Juraj Henry, Gregory W. Skalický, Jan Ziznovsky, Jozef
http://linked.open...ain/vavai/riv/wos	000266730500021
issn	0004-6361
number of pages	11 (xsd:int)
http://localhost/t...ganizacniJednotka	14310
is http://linked.open...avai/riv/vysledek of	The nature of the light variability of the silicon star HR 7224 The nature of the light variability of the silicon star HR 7224 The nature of the light variability of the silicon star HR 7224 The nature of the light variability of the silicon star HR 7224

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