Spectroscopy of the roAp star α Cir -: I.: Velocities of Hα and metal lines

被引：48

作者：

Baldry, IK ^{[1
]}

Bedding, TR

Viskum, M

Kjeldsen, H

Frandsen, S

机构：

[1] Univ Sydney, Sch Phys, Chatterton Astron Dept, Sydney, NSW 2006, Australia

[2] Univ Aarhus, Inst Phys & Astron, DK-8000 Aarhus C, Denmark

[3] Univ Aarhus, Theoret Astrophys Ctr, DK-8000 Aarhus C, Denmark

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 1998年 / 295卷 / 01期

关键词：

techniques; radial velocities; stars; chemically peculiar; individual; alpha Cir; oscillations;

D O I：

10.1046/j.1365-8711.1998.29511167.x

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present radial velocity measurements of the rapidly oscillating Ap (roAp) star alpha Cir, obtained from dual-site observations with medium-dispersion spectrographs. The amplitude and phase of the principal pulsation mode vary significantly, depending on which line is being measured. The amplitude is observed to be as high as 1000 m s(-1) in some wavelength bands, despite a previous upper limit of 36 m s(-1). Furthermore, some lines are apparently pulsating in anti-phase with others. We suggest this indicates a high-overtone standing wave with a velocity node in the atmosphere of the star.

引用

页码：33 / 42

页数：10

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