2006A&A...453.1041J


C.D.S. - SIMBAD4 rel 1.7 - 2021.02.26CET17:44:59

2006A&A...453.1041J - Astronomy and Astrophysics, volume 453, 1041-1050 (2006/7-3)

Non-radial pulsations in the γ Doradus star HD 195068.

JANKOV S., MATHIAS P., CHAPELLIER E., LE CONTEL J.-M. and SAREYAN J.-P.

Abstract (from CDS):

We present high resolution spectroscopic observations of the γ Doradus star HD195068. About 230 spectra were collected over 2 years. Time series analysis performed on radial velocity data shows a main peak at 1.61d–1, a frequency not yet detected in photometry. The Hipparcos photometric 1.25d–1 frequency is easily recovered as is 1.30d–1 while the third photometric frequency, 0.97d–1, is only marginally present. The good quality of our data, which includes 196 spectra collected over seven consecutive nights, shows that both the 1.61d–1 and intermediate 1.27d–1 (mixture of 1.25 and 1.30d–1) frequencies are present in the line profile variations. Using the Fourier-Doppler Imaging (FDI) method, the variability associated with 1.61d–1 can be successfully modeled by a non-radial pulsation mode l=5±1, |m|=4±1. For the intermediate frequency 1.27d–1 we deduce l=4±1, |m|=3±1. Evidence that the star is not pulsating in the radial mode (l=0) rules out a previous classification as an RR Lyrae type star. We investigate the time variability of FDI power spectra concluding that the observed temporal variability of modes can be explained by a beating phenomenon between closely spaced frequencies of two non-radial modes. The distribution of the oscillation power within the line profile indicates that there is a significant tangential velocity component of oscillations characteristic of high radial order gravity modes which are predicted to be observed in γ Doradus type stars.

Abstract Copyright:

Journal keyword(s): line: profiles - stars: variables: general - stars: oscillations

Simbad objects: 11

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Number of rows : 11

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 V* FO Cet gD* 02 06 10.7295548331 -10 16 34.378661464   7.03 6.73     F0V 45 0
2 * gam Dor gD* 04 16 01.5882311191 -51 29 11.919063290   4.55 4.20     F1V 294 0
3 * tet02 Tau dS* 04 28 39.7445471109 +15 52 15.122606898 3.690 3.600 3.410 5.43   A7III 423 0
4 V* V350 CMa gD* 06 42 46.0439873451 -22 26 54.933639357   6.56 6.23     F2V 59 0
5 HD 49434 gD* 06 48 19.0657567870 -01 19 08.128922715   6.015 5.731     F0V+ 86 0
6 V* DD CVn gD* 12 24 56.9361558206 +42 51 17.109539057   7.51 7.14     F2V 61 0
7 V* V2118 Oph gD* 18 01 33.2034743748 +11 17 08.736474287   7.37 7.01     F2IV-V 63 0
8 * 43 Cyg gD* 20 27 02.2677205309 +49 23 00.097973075   6.024 5.715     F0V: 53 0
9 V* V372 Peg gD* 21 47 04.7603284954 +17 11 38.540792675   6.507 6.174     F3V 60 0
10 V* CK Ind gD* 22 04 38.4299738040 -64 43 42.007848070   7.57 7.32     A9/F0V-IV 81 0
11 HD 218396 El* 23 07 28.7156905667 +21 08 03.302133882   6.21 5.953     F0+VkA5mA5 935 0

    Equat.    Gal    SGal    Ecl

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2021.02.26-17:44:59

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