2007A&A...470.1089K


Query : 2007A&A...470.1089K

2007A&A...470.1089K - Astronomy and Astrophysics, volume 470, 1089-1098 (2007/8-2)

The light variability of the helium strong star HD 37776 as a result of its inhomogeneous elemental surface distribution.

KRTICKA J., MIKULASEK Z., ZVERKO J. and ZIZNOVSKY J.

Abstract (from CDS):

We simulate light curves of the helium strong chemically peculiar star HD 37776 assuming that the observed periodic light variations originate as a result of inhomogeneous horizontal distribution of chemical elements on the surface of a rotating star. We show that chemical peculiarity influences the monochromatic radiative flux, mainly due to bound-free processes. Using the model of the distribution of silicon and helium on HD 37776 surface, derived from spectroscopy, we calculate a photometric map of the surface and consequently the uvby light curves of this star. Basically, the predicted light curves agree in shape and amplitude with the observed ones. We conclude that the basic properties of variability of this helium strong chemically peculiar star can be understood in terms of the model of spots with peculiar chemical composition.

Abstract Copyright:

Journal keyword(s): stars: chemically peculiar - stars: early-type - stars: variables: general - stars: atmospheres

Simbad objects: 5

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Number of rows : 5
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 * 56 Ari a2* 03 12 14.2461137352 +27 15 25.085668788 5.22 5.64 5.76     B6IV-V 264 0
2 * sig Ori E Y*O 05 38 47.2050040320 -02 35 40.521424812 5.66 6.38 6.46 6.84 7.08 B2IV-Vp_He 451 0
3 V* V901 Ori Ro* 05 40 56.3704617744 -01 30 25.856677224 5.96 6.82 6.96     B2V 330 2
4 IC 431 RNe 05 41 -01.6           ~ 9 0
5 V* CU Vir a2* 14 12 15.8054758 +02 24 33.953395 4.46 4.90 5.02 5.10 5.23 ApSi 386 0

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2023.09.30-18:35:58

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