Volume 524, December 2010
|Number of page(s)||7|
|Section||Stellar structure and evolution|
|Published online||19 November 2010|
A Renaissance study of Am stars
I. The mass ratio distribution
ESO, Alonso de Córdova 3107, Casilla 19001,
Accepted: 20 August 2010
Aims. Triggered by the study of Carquillat & Prieur (2007, MNRAS, 380, 1064) of Am binaries, I reanalyse their sample of 60 orbits to derive the mass ratio distribution (MRD), assuming as they did a priori functional forms, i.e. a power law or a Gaussian. The sample is then extended using orbits published by several groups and a full analysis of the MRD is made, without any assumption on the functional form.
Methods. I derive the MRD using a Richardson-Lucy inversion method, assuming a fixed mass of the Am primary and randomly distributed orbital inclinations. Using the large sub-sample of double-lined spectroscopic binaries, I show that this methodology is indeed perfectly adequate.
Results. I first derive new parameters of the functional form for the Carquillat & Prieur sample. Using the inversion method, applied to my extended sample of 162 systems, I find that the final MRD can be approximated by a uniform distribution.
Key words: stars: chemically peculiar / binaries: spectroscopic / methods: statistical
© ESO, 2010
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