The p-mode spectrum of γ Equ (HR 8097)

Autor(en)

Peter Martinez, Werner Wolfgang Weiss, Matthew J. Nelson, Tobias J N Kreidl, Greg R. Roberts, David E. Mkrtichian, N I Dorokhov, Tatyana N Dorokhova, Peter V. Birch

Abstrakt

We present new high-speed photometric observations of the rapidly oscillating Ap (roAp) star ? Equ acquired on 26 nights during 1992. A frequency analysis of these observations reveals the presence of four p modes with frequencies of 1339, 1366, 1397 and 1427 œHz. These frequencies are all roughly equally spaced by about 30 œHz, which we interpret as the spacing of alternating even and odd l modes for a slightly evolved A-type star. This interpretation leads to an asteroseismological luminosity estimate for ? Equ of MV(?v) = 1.8, which is in good agreement with the parallax luminosity MV(p) = 1.9.

Organisation(en)

Institut für Astrophysik

Externe Organisation(en)

Northern Arizona University, Odessa Astronomical Observatory, Perth Observatory, University of Cape Town, University of Wisconsin, Madison, South African Astronomical Observatory (SAAO)

Journal

Monthly Notices of the Royal Astronomical Society

Band

282

Seiten

243-251

Anzahl der Seiten

9

ISSN

0035-8711

DOI

https://doi.org/10.1093/mnras/282.1.243

Publikationsdatum

1996

Peer-reviewed

Ja

ÖFOS 2012

103003 Astronomie

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/the-pmode-spectrum-of--equ-hr-8097(50c22278-3185-4836-afa2-3167b37c025c).html