2008A&A...488..643B


C.D.S. - SIMBAD4 rel 1.7 - 2021.03.01CET21:47:22

2008A&A...488..643B - Astronomy and Astrophysics, volume 488, 643-651 (2008/9-3)

Amplitude variability and multiple frequencies in 44 Tauri: 2000-2006.

BREGER M. and LENZ P.

Abstract (from CDS):

This study has three principal aims: (i) to increase the number of detected pulsation modes of 44 Tauri, especially outside the previously known frequency ranges; (ii) to study the amplitude variability and its systematics; and (iii) to examine the combination frequencies. During the 2004/5 and 2005/6 observing seasons, high-precision photometry was obtained with the Vienna Automatic Photoelectric Telescope in Arizona during 52 nights. Together with previous campaigns, a data base from 2000 to 2006 was available for multifrequency analyses. Forty-nine pulsation frequencies are detected, of which 15 are independent pulsation modes and 34 combination frequencies or harmonics. The newly found gravity mode at 5.30/cd extends the known frequency range of instability. Strong amplitude variability from year to year is found for the l=1 modes, while the two radial modes have essentially constant amplitudes. Possible origins of the amplitude variability of the l=1 modes, such as precession of the pulsation axis, beating and resonance effects are considered. The amplitudes of the combination frequencies, fi+fj, mirror the variations in the parent modes. The combination parameter, which relates the amplitudes of the combination frequencies to those of the parent modes, is found to be different for different parents.

Abstract Copyright:

Journal keyword(s): techniques: photometric - stars: variables: δ Sct - stars: oscillations - stars: general

Simbad objects: 8

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Number of rows : 8

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 HD 23626 SB* 03 47 49.0212728600 +32 11 43.489948864   6.718 6.252     G0 40 0
2 HD 24301 PM* 03 52 59.3538365563 +26 40 42.730379778       7.6   G0IV 31 0
3 HD 25768 SB* 04 06 04.5550052083 +26 12 42.442883643 8.100 8.080 7.580     F8 27 0
4 * psi Tau PM* 04 07 00.4569690568 +29 00 04.708418391   5.57 5.2     F0 86 0
5 * p Tau dS* 04 10 49.8603883663 +26 28 51.433802246   5.715 5.387     F2IV-V 194 0
6 * nu. Eri bC* 04 36 19.1414419 -03 21 08.856678 2.82 3.737 3.928     B2III 373 0
7 V* FG Vir dS* 12 14 15.4567370777 -05 42 59.750421714   6.807 6.558     A8/9V 209 0
8 * 12 Lac bC* 22 41 28.6491950195 +40 13 31.619242453 4.24 5.080 5.229     B2III 347 0

    Equat.    Gal    SGal    Ecl

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2021.03.01-21:47:22

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