2006A&A...456..261R


Query : 2006A&A...456..261R

2006A&A...456..261R - Astronomy and Astrophysics, volume 456, 261-268 (2006/9-2)

Asteroseismology of the new multiperiodic γ Dor variable HD239276.

RODRIGUEZ E., COSTA V., ZHOU A.-Y., GRIGAHCENE A., DUPRET M.A., SUAREZ J.C., MOYA A., LOPEZ-GONZALEZ M.J., WEI J.-Y. and FAN Y.

Abstract (from CDS):

The variability of HD239276 was suspected photometrically nearly twenty years ago, but was confirmed with new observations obtained in 2001 during a two-site photometric campaign carried out from Spain, in uvbyβ Stroemgren-Crawford photometry, and China, using the Johnson V filter. Two low-dispersion spectra were also collected. The results establish this star as a new multiperiodic γ Dor-type pulsator with deficiency in metallicity. Its possible λ Boo nature is discussed. The frequency analysis shows three pulsational frequencies as significant, but some more are probably present among the residuals. The method based on phase shifts and amplitude ratios in multicolour photometry is used to identify the excited modes with non-adiabatic time-dependent convection models. A very good agreement between the theoretical and observed amplitude ratios is obtained and the two main modes are identified as l=1 modes. Nevertheless, our results do not allow us to discriminate between a solar abundance and a metal deficient nature for this star. The frequency ratio method is further used for the identification of the modes. The results suggest low metallicity for this star, but a λ Boo nature may be not ruled out.

Abstract Copyright:

Journal keyword(s): stars: variables: general - stars: individual: HD239276 - stars: oscillations - techniques: photometric

VizieR on-line data: <Available at CDS (J/A+A/456/261): table2.dat table3.dat table4.dat>

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 - 2023
#notes
1 HD 186760 PM* 19 43 14.4186159816 +58 00 59.821870032   6.871 6.295     G0V 68 0
2 HD 189296 * 19 56 19.0501404480 +56 41 13.232870844 6.320 6.250 6.160     A4Vn 30 0
3 HD 239265 * 19 57 11.0069844384 +58 36 11.476442952   9.66 9.57     A0 5 0
4 HD 239276 gD* 19 59 25.3112723304 +58 33 20.000117520   9.36 9.10     A3 12 0
5 V* XX Cyg SX* 20 03 15.6420308880 +58 57 16.525249632   11.99 11.86     A5-F5 117 0
6 HD 191096 PM* 20 05 21.4927152288 +56 20 29.108659416 6.600 6.590 6.180     F4V 54 0
7 HD 218396 El* 23 07 28.7157209544 +21 08 03.310767492   6.21 5.953     F0+VkA5mA5 1058 0
8 HD 218427 gD* 23 07 28.9502553624 +49 02 37.102223868   8.47 8.16     F0 25 0

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2023.02.04-10:49:24

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