Searching for solar-like oscillations in the δ scuti star ρ puppis

V. Antoci*, G. Handler, F. Grundahl, F. Carrier, E. J. Brugamyer, P. Robertson, H. Kjeldsen, Y. Kok, M. Ireland, J. M. Matthews

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)
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Abstract

Despite the shallow convective envelopes of δ Scuti pulsators, solar-like oscillations are theoretically predicted to be excited in those stars as well. To search for such stochastic oscillations, we organized a spectroscopic multisite campaign for the bright, metal-rich δ Sct star ρ Puppis. We obtained a total of 2763 high-resolution spectra using four telescopes. We discuss the reduction and analysis with the iodine cell technique, developed for searching lowamplitude radial velocity variations, in the presence of high-amplitude variability. Furthermore, we have determined the angular diameter of ρ Puppis to be 1.68 ± 0.03 mas, translating into a radius of 3.52 ± 0.07 R·. Using this value, the frequency of maximum power of possible solar-like oscillations is expected at ~43±2 c d-1 (498 ± 23 μHz). The dominant δ Scuti-type pulsation mode of ρ Puppis is known to be the radial fundamental mode which allows us to determine the mean density of the star, and therefore an expected large frequency separation of 2.73 c d-1 (31.6 μHz). We conclude that (1) the radial velocity amplitudes of the δ Scuti pulsations are different for different spectral lines; (2) we can exclude solar-like oscillations to be present in ρ Puppis with an amplitude per radial mode larger than 0.5ms-1.

Original languageEnglish
Pages (from-to)1563-1575
Number of pages13
JournalMonthly Notices of the Royal Astronomical Society
Volume435
Issue number2
DOIs
Publication statusPublished - Oct 2013

Bibliographical note

This article has been accepted for publication in Monthly notices of the Royal Astronomical Society. Copyright 2013 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

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