Query : 2003A&A...399L..11A

2003A&A...399L..11A - Astronomy and Astrophysics, volume 399, L11-14 (2003/2-3)

Why does the spotted UX Ari system get bluer as it gets darker?


Abstract (from CDS):

We present simplified calculations of UX Ari B-V colour index and V magnitude for a range of parameter values. The results of our calculations are compared to previously published measurements. We find that our calculations reproduce the well established colour-brightness relation (UX Ari gets bluer as it gets darker) only if the dark spots on the surface of the K star are accompanied by bright facular areas. There is currently an ambiguity between the temperature of the facular areas and the portion of the stellar surface occupied by them.

Abstract Copyright:

Journal keyword(s): stars: activity - binaries: spectroscopic - stars: individual: UX Ari - stars: late-type - starspots

Simbad objects: 2

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Number of rows : 2
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
1 V* UX Ari RS* 03 26 35.3756804760 +28 42 54.226408428 7.76 7.28 6.37     K0IV 678 0
2 V* RS CVn RS* 13 10 36.9077924448 +35 56 05.584994412 8.57 8.51 7.93 7.7   F6IV+G8IV 701 0

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