Discovery of hybrid ? Dor and ? Sct pulsations in BD+18 4914 through MOST spacebased photometry

Autor(en)

Jason F. Rowe, Jaymie M. Matthews, Rainer Kuschnig, Werner Wolfgang Weiss

Abstrakt

We present a total of 57 days of contiguous, high-cadence photometry (14 days in 2004 and 43 in 2005) of the star BD+18 4914 obtained with the MOST1 satellite. We detect 16 frequencies down to a signal-to-noise of 3.6 (amplitude 0.5 mmag). Six of these are less than 3 cycles/day, and the other ten are between 7 and 16 cycles/day. We intrepret the low frequencies as g-mode ? Doradus-type pulsations and the others as ? Scuti-type p-modes, making BD+18 4914 one of the few known hybrid pulsators of its class. If the g-mode pulsations are high-overtone non-radial modes with identical low degree, we can assign a unique mode classification of n={12, 20, 21, 22, 31, 38} based on the frequency ratio method.

Organisation(en)

Institut für Astrophysik

Externe Organisation(en)

University of British Columbia (UBC)

Journal

Communications in Asteroseismology

Band

148

Seiten

34-43

Anzahl der Seiten

10

ISSN

1021-2043

DOI

https://doi.org/10.1553/cia148s34

Publikationsdatum

2006

Peer-reviewed

Ja

ÖFOS 2012

103003 Astronomie

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/3852a23d-9c63-4cb3-9705-a3303a837334