On the nature of small amplitude peaks in $δ$ Scuti oscillation spectra

Details On the nature of small amplitude peaks in $δ$ Scuti oscillation spectra On the nature of small amplitude peaks in $δ$ Scuti oscillation spectra

2005-09-15

arxiv.org/abs/astro-ph/0509449v1

Mem.Soc.Ast.It.77:113-116,2006

Astronomy and Astrophysics

Astrophysics

4 pages, 6 figures, to appear in the proceedings of the Workshop "Stellar pulsation and evolution", 2005. Monte Porzio Catone,

Scientific paper

The standard assumption in interpretation of stellar oscillation spectra from photometry is that the excited mode have low angular degrees, typically $\ell< 3$. Considering the case of FG Vir, the $\delta$ Scuti star with the richest known oscillation spectrum, we show that this assumption is not justified for low amplitude peaks. The $\ell<3$ identifications have been found for 12 dominant peaks from pulsation amplitudes and phases. However, we show that for the rest of the peaks (55), whose amplitudes are typically below 1 mmag, much higher $\ell$'s are most likely. We argue that improving amplitude resolution to the micromagnitude level, as expected from space observations, is not likely to be rewarded with a credible mode identifications because the spectra will be dominated by high-$\ell$ modes of unknown azimuthal order, $m$.

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