Forum Springer Astron. Astrophys.
Forum Whats New Search Orders

Astron. Astrophys. 323, 844-852 (1997)

Table of Contents
Available formats: HTML | PDF | (gzipped) PostScript

High azimuthal number pulsation modes in fast rotating [FORMULA] Scuti stars: the case of HD 101158 [FORMULA] V837 Cen *

L. Mantegazza 1, 2

1 Dipartimento di Fisica Nucleare e Teorica, Università di Pavia, Via Bassi 6, I-27100 Pavia, Italy
2 Osservatorio Astronomico di Brera, Via E. Bianchi 46, I-22055 Merate, Italy

Received 18 March 1996 / Accepted 13 September 1996


The frequency analysis of the line profile variations of the fast rotating [FORMULA] Scuti star HD 101158, observed for three consecutive nights, shows the presence of two high azimuthal number non radial pulsation modes. The star is probably seen almost equator-on and both modes [FORMULA] c/d and [FORMULA] c/d) are prograde with [FORMULA] and [FORMULA] or -15 respectively; their frequencies are different with respect to the three frequencies identified in photometric data (Poretti 1991), which probably owe due to low [FORMULA] modes. Indications of the presence of these photometric modes have been found from the frequency analysis of the first two line moments. The line profile variations also show the possible presence of further modes with frequencies of 16.2, 20.3 and 21.1 c/d and small amplitudes.

Key words: data analysis – spectroscopy – stars: ffi Sct – stars: individual: HD 101158 – stars: oscillation of

* Based on observations made at the European Southern Observatory (ESO), La Silla, Chile

Send offprint requests to: L. Mantegazza

© European Southern Observatory (ESO) 1997

Online publication: May 26, 1998