The dependence of the characteristics of the brightness variability of Herbig Ae/Be stars on the orientation of their star-disk systems

We analyze the brightness variability of six Herbig Ae/Be stars: V1331 Cyg, LkHα198=V633 Cas, AS 442, XY Per, V517 Cyg, and WW Vul. The last two objects are UX Ori stars showing Algol-like brightness dips with amplitudes of . AS 442 and XY Per also exhibit brightness dips but with considerably lower...

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Bibliographic Details
Published inAstronomy reports Vol. 45; no. 9; pp. 686 - 691
Main Author Mel'nikov, S Yu
Format Journal Article
LanguageEnglish
Published Heidelberg Springer Nature B.V 01.09.2001
Subjects
Accretion
Accretion disks
Amplitudes
Astronomy
Astrophysics
B stars
Brightness
Deposition
Light curve
Luminosity
Star brightness
Stars
Stars & galaxies
Variability
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Summary:We analyze the brightness variability of six Herbig Ae/Be stars: V1331 Cyg, LkHα198=V633 Cas, AS 442, XY Per, V517 Cyg, and WW Vul. The last two objects are UX Ori stars showing Algol-like brightness dips with amplitudes of . AS 442 and XY Per also exhibit brightness dips but with considerably lower amplitudes, . On the contrary, such dips are not present in the light curves of V1331 Cyg and LkHα198, where stochastic variability with amplitudes of on timescales of about a day can be seen. AS 442 and XY Per also show stochastic variability, but with lower amplitudes . These different types of variability could be related to the orientations of the star-disk systems. We suggest that the brightness variations in young stars whose disks are viewed edge-on are mainly due to non-uniform absorption, whereas the character of the variability in stars with pole-on disks is determined by non-stationary accretion.
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ISSN:1063-7729
1562-6881
DOI:10.1134/1.1398917