Determination of the rotation periods for the roAp stars HD 9289 and HD 190290 and non-detection of rotational amplitude modulation in the roAp stars HD 75425 and HD 217522

被引：5

作者：

van Heerden, P. ^{[1
,2
]}

Martinez, P. ^{[3
]}

Kilkenny, D. ^{[4
]}

机构：

[1] Univ Cape Town, Dept Astron, ZA-7701 Rondebosch, South Africa

[2] Univ Johannesburg, Dept Phys APK, ZA-2006 Auckland Pk, South Africa

[3] S African Astron Observ, ZA-7925 Observatory, South Africa

[4] Univ Western Cape, Dept Phys, ZA-7535 Bellville, South Africa

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2012年 / 426卷 / 02期

基金：

新加坡国家研究基金会;

关键词：

stars: individual: HD 9289; HD; 190290; 75425; 217522; UNEQUALLY-SPACED DATA; OSCILLATIONS; DISCOVERY; HD-217522;

D O I：

10.1111/j.1365-2966.2012.21814.x

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present differential photometric observations of four rapidly oscillating Ap stars to determine their rotation periods. Based on 55 observations (over four seasons) of HD 9289, it was found to rotate with a period of 8.55 +/- 0.08?d. Similarly, 21 observations in one season were used to determine the rotation period of HD 190290 (4.03 +/- 0.13?d). Differential photometry of HD 75425 (50 observations over three consecutive seasons) showed that it exhibits no photometric variability above 4 mmag. Differential photometry of HD 217522 (60 observations over three seasons) revealed no periodic photometric variability greater than 6 mmag.

引用

页码：969 / 974

页数：6