Line profile variations in $\gamma$ Doradus
Line profile variations in $\gamma$ Doradus
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DOI：
10.1093/mnras/281.4.1315
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发表时间：
1996-03
影响因子：
4.8
通讯作者：
L. Balona;T. Bohm;B. Foing;K. Ghosh;E. Janot-Pacheco;K. Krisciunas;A. Lagrange;W. Lawson;S. D. James;J. Baudrand;C. Català;M. Dreux;P. Felenbok;J. Hearnshaw
中科院分区：
文献类型：
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作者：
L. Balona;T. Bohm;B. Foing;K. Ghosh;E. Janot-Pacheco;K. Krisciunas;A. Lagrange;W. Lawson;S. D. James;J. Baudrand;C. Català;M. Dreux;P. Felenbok;J. Hearnshaw
我们目前的数据，从高色散阶梯光谱和同时$uvby$测光$\gamma$~剑鱼。这些数据是1994年11月作为MUSICOS-94运动的一部分从几个地点获得的。这颗星星有两个间隔很近的周期，周期约为0.75 d，是一类新的早期F型变星中最亮的成员。一个先前怀疑的第三个时期，非常接近其他两个，得到证实。以前的观测表明，可以预期光谱会发生突然变化，但在运动期间没有发现。径向速度排除了近伴星的可能性。最强周期分量的径向速度和光变曲线之间的相位排除了星点模型。唯一可行的机制来理解的变化是非径向脉动。我们用矩量法来识别三个周期分量的脉动模式。这些似乎是具有球谐度（$\ell，m$）的扇形逆行模式，如下：$f_1$ =（3，3），$f_2$ =（1，1）和$f_4$ =（1，1）。我们发现这颗星星的倾斜角为$i \approximat 70 ^\circ $。
We present data from high-dispersion echelle spectra and simultaneous $uvby$ photometry for $\gamma$~Doradus. These data were obtained from several sites during 1994 November as part of the MUSICOS-94 campaign. The star has two closely-spaced periods of about 0.75 d and is the brightest member of a new class of variable early F-type stars. A previously suspected third period, very close to the other two, is confirmed. Previous observations indicated that sudden changes could be expected in the spectrum, but none were found during the campaign. The radial velocities rule out the possibility of a close companion. The phasing between the radial velocity and light curve of the strongest periodic component rules out the starspot model. The only viable mechanism for understanding the variability is nonradial pulsation. We used the method of moments to identify the modes of pulsation of the three periodic components. These appear to be sectorial retrograde modes with spherical harmonic degrees, ($\ell, m$), as follows: $f_1$ = (3,3), $f_2$ = (1,1) and $f_4$ = (1,1). The angle of inclination of the star is found to be $i \approx 70^\circ$.