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Mon. Not. R. Astron. Soc. 000, 000{000 (0000) Printed 31 July 1999 (MN L A T E X style le v1.4) Photometric modelling of starspots. II. The
 

Summary: Mon. Not. R. Astron. Soc. 000, 000{000 (0000) Printed 31 July 1999 (MN L A T E X style le v1.4)
Photometric modelling of starspots. II. The
FORTRAN code SPOTPIC
P.J. Amado 1? , J. G. Doyle 1 and P.B. Byrne y
1 Armagh Observatory, College Hill, Armagh BT61 9DG, N. Ireland
31 July 1999
ABSTRACT
A FORTRAN code which computes synthetic light and colour curves of
active, spotted stars has been developed. The main feature of this code is its
ability to model simultaneously the V light curve and the (V {R) c , (V {I) c and
(V {K) colour data. It also uses new e ective temperature-colour and Barnes-
Evans-like calibrations, temperature and gravity-dependent limb-darkening
coe∆cients and di erent e ective surface gravities for the spotted and unspot-
ted photosphere. The code allows for two-component spots, i.e., spots with
umbral and penumbral components. Various problematic spot con gurations
were investigated, taking us to the conclusion that, in order to be able to dif-
ferentiate spots with various thermal structures (umbrae, penumbrae, faculae)
or polar spots from equatorial bands, the modelling of the infrared colours,
especially (V {I) c and (V {K), is needed.
Key words: starspots { stars: late-type

  

Source: Armagh Observatory

 

Collections: Physics