HIGH-SPEED ULTRAVIOLET PHOTOMETRY OF HD-60435

被引:6
作者
TAYLOR, M
NELSON, MJ
BLESS, RC
DOLAN, JF
ELLIOT, JL
PERCIVAL, JW
ROBINSON, EL
VANCITTERS, GW
机构
[1] NASA,GODDARD SPACE FLIGHT CTR,ASTRON & SOLAR PHYS LAB,GREENBELT,MD 20771
[2] MIT,DEPT EARTH & PLANETARY SCI,CAMBRIDGE,MA 02139
[3] UNIV TEXAS,DEPT ASTRON,AUSTIN,TX 78712
[4] NATL SCI FDN,DIV ASTRON SCI,WASHINGTON,DC 20550
[5] USN ACAD,DEPT AEROSP ENGN,ANNAPOLIS,MD 21402
关键词
STARS; INDIVIDUAL; (HD-60435); OSCILLATIONS; PECULIAR;
D O I
10.1086/186975
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
In this Letter, we present the first high-speed ultraviolet photometry of a oscillating Ap star, HD 60435. After removing known orbital effects related to the Hubble Space Telescope, we confirm the presence of a strong pulsation period at a frequency of 123.70 cycles per day. In addition, we find significant amplitude modulation of this frequency that we suggest could be the result of beating of multiple periodicities. In this context, we suggest evidence for the presence of four additional frequencies at nu = 120.56, 126.55, 149.49, and 221.03 cycles per day. Three of these frequencies correspond well to frequencies detected in optical observations of HD 60435. The fourth, at 149.49 cycles per day, if real, is a potentially new pulsation mode that has not been detected in ground-based observations of this star. The amplitude of the 123 cycles per day pulsation is significantly larger in the ultraviolet than it is in the blue.
引用
收藏
页码:L125 / L128
页数:4
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