The EC 14026 stars - VI. PG 1047+003

被引:34
作者
O'Donoghue, D
Koen, C
Lynas-Gray, AE
Kilkenny, D
van Wyk, F
机构
[1] SAAO, ZA-7935 Observatory, Cape Town, South Africa
[2] Univ Cape Town, Dept Astron, ZA-7700 Rondebosch, South Africa
[3] Univ Oxford, Dept Phys, Oxford OX1 3RH, England
关键词
stars; individual; PG; 1047; 003; oscillations;
D O I
10.1046/j.1365-8711.1998.01311.x
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We report the discovery of rapid oscillations in the sdB star PG 1047 + 003. The oscillations are multiperiodic, with nine periods in the range 104-162 s. The optical spectrum of PG 1047 + 003 is consistent with that of a single sdB star. Line profile fitting yields an effective temperature of 35000+/-1000 K and log g=5.9+/-0.1, although optical photometry and IUE spectrophotometry may indicate a cooler effective temperature. These properties demonstrate that PG1047+003 is an EC 14026 star, a recently discovered class of sdB pulsators. Optical and infrared photometry constrains any cool companion to the sdB star to be a main-sequence star of spectral type MO or later. With V=13.47 and a relatively rich pulsation spectrum, PG1047+003 is an attractive target for an intensive photometric campaign to extract more periods from the light curve which, along with a suitable grid of pulsation models, will probe the interior structure of the star.
引用
收藏
页码:306 / 316
页数:11
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