A SEARCH FOR SOLAR-LIKE OSCILLATIONS IN ALPHA-CENTAURI-A

被引：27

作者：

BROWN, TM

GILLILAND, RL

机构：

[1] High Altitude Observatory, Boulder, CO 80307

[2] Space Telescope Science Institute, Homewood Campus, Johns Hopkins University, Baltimore

来源：

ASTROPHYSICAL JOURNAL | 1990年 / 350卷 / 02期

关键词：

Stars: individual (α Cen); Stars: pulsation; Sun: oscillations;

D O I：

10.1086/168435

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We describe spectrographic observations made in the course of a search for solar-like acoustic oscillations in α Cen A. The observational method was to search for periodical Doppler-shift variations in all of the spectrum lines within the wavelength range accessible to a high-dispersion echelle spectrograph - about 30 nm centered on 427.5 nm, in our case. We also searched for variations in the ratio of line core to continuum intensity, again averaged over all the available lines. We found no convincing oscillations in either case, with upper limits for typical single oscillation mode of 70 cm s-1 in Doppler shift and 4 × 10-5 for continuum intensity variations inferred from line core intensities.

引用

页码：839 / 845

页数：7

共 18 条

[1]

[Anonymous], 1986, NUMERICAL RECIPES

[2] DEPTH AND LATITUDE DEPENDENCE OF SOLAR ROTATION [J].