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A&A 428, 209--214 (2004) DOI: 10.1051/00046361:20041266

Summary: A&A 428, 209--214 (2004)
DOI: 10.1051/0004­6361:20041266
# ESO 2004
Astronomy &
Synthetic photometry for non­radial pulsations
in subdwarf B stars
B. Ramachandran 1 , C. S. Je#ery 1 , and R. H. D. Townsend 2,3
1 Armagh Observatory, College Hill, Armagh BT61 9DG, Northern Ireland, UK
e­mail: brc@arm.ac.uk
2 Bartol Research Institute, University of Delaware, Newark, DE 19716, USA
3 Department of Physics & Astronomy, University College London, Gower Street, London WC1E 6BT, UK
Received 10 May 2004 / Accepted 12 August 2004
Abstract. We describe a method for computing theoretical photometric amplitude ratios for a number of modes of nonradially
pulsating subdwarf B stars in both SDSS and UBVR systems. In order to avoid costly solutions of the non­adiabatic non­
radial pulsation equations, we have adopted the adiabatic approximation. We argue that this is a valid approach, at least for
the V361 Hya stars, because observations show that the temperature perturbations dominate the radius perturbations in the
flux variation. We find that for V361 Hya stars, low­degree (# = 0, 1, 2) modes may be di#cult to distinguish using optical
photometry. However, the high degree modes (# = 3, 4) are relatively well separated and may be distinguished more easily. We


Source: Armagh Observatory


Collections: Physics