Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001arep...45..686m&link_type=abstract
Astronomy Reports, vol. 45, Issue 9, p.686-691
Astronomy and Astrophysics
Astronomy
Scientific paper
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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