Query : 2001A&A...366..547M

2001A&A...366..547M - Astronomy and Astrophysics, volume 366, 547-557 (2001/2-1)

Simultaneous intensive photometry and high resolution spectroscopy of δ Scuti stars. V. The high-degree modes in the pulsational content of BV Circini.


Abstract (from CDS):

We discuss here the pulsation properties of the δ Scuti star BV Circini on the basis of data obtained during a simultaneous photometric and spectroscopic campaign in 1996 and a spectroscopic one in 1998, and taking also advantage of the previous photometric observations by Kurtz (1981MNRAS.196...53K). Nine pulsation modes were detected from photometry and thirteen from spectroscopy; five of them are in common to both techniques. The spectroscopic data give ample evidence of dramatic amplitude variations in some modes, in particular the strongest spectroscopic mode in 1998 was not detectable in 1996 data. The two dominant photometric modes (6.33 and 7.89c/d) are observed on both seasons. The typing of the modes was performed by means of a simultaneous model fit of line profile and light variations. The 6.33c/d photometric term is probably the fundamental radial mode, while the 7.89c/d is a nonradial mode with m!=0. There are six high-degree prograde modes with an azimuthal order m ranging from -12 to -14, and also a retrograde mode with m∼7. These modes combined with the identification of the 6.33c/d mode allowed us to estimate i∼60° for the value of the inclination of the rotation axis. An accurate evaluation of the main stellar physical parameters is also proposed as a result of the pulsational analysis.

Abstract Copyright:

Journal keyword(s): methods: data analysis - techniques: spectroscopic - techniques: photometric - stars: individual: BV Cir - stars: oscillations - stars: variables: δ Sct

Simbad objects: 5

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Number of rows : 5
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
1 V* BB Phe dS* 00 30 27.8252358240 -40 56 22.504091136   6.490 6.172     F0/2III 48 0
2 * gam02 Cae dS* 05 04 26.1570986024 -35 42 18.382481569   6.61 6.31     F2IV/V 75 0
3 V* FG Vir dS* 12 14 15.4565381808 -05 42 59.750820036   6.807 6.558     A8/9V 211 0
4 HD 132249 PM* 15 00 44.9285317560 -59 48 42.406801020   7.79 7.31     F5V 29 0
5 V* BV Cir dS* 15 01 02.2368609096 -64 34 33.788995824   6.85 6.56     A9/F0IV/V 42 0

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