EC11575-1845 - A NEW CLOSE BINARY WITH A LARGE REFLECTION EFFECT DISCOVERED BY THE EDINBURGH-CAPE SURVEY

被引：23

作者：

CHEN, A ^{[1
]}

ODONOGHUE, D ^{[1
]}

STOBIE, RS ^{[1
]}

KILKENNY, D ^{[1
]}

ROBERTS, G ^{[1
]}

VANWYK, F ^{[1
]}

机构：

[1] S AFRICAN ASTRON OBSERV,CAPE TOWN 7935,SOUTH AFRICA

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 1995年 / 275卷 / 01期

关键词：

BINARIES; CLOSE; STARS; INDIVIDUAL; EC11575-1845; NOVAE; CATACLYSMIC VARIABLES; VARIABLES; OTHER;

D O I：

10.1093/mnras/275.1.100

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

EC11575 - 1845 is a non-eclipsing binary consisting of an sdO primary and a late M-type secondary showing a large reflection effect. UBVRI photometry reveals an orbital period of 7.86 h, with the amplitude of the reflection effect increasing with wavelength as expected. The spectroscopic behaviour reveals absorption lines from the primary and variable intensity emission-line features from the heated face of the secondary. The radial velocity variations of both components restrict the mass ratio to M(2)/M(1) = 0.29-0.32. A self-consistent model can be derived for the system using Napier's algorithm, which constrains the masses and radii of the components, the orbital inclination and the effective temperature of the primary. From evolutionary considerations it is shown that EC11575 - 1845 belongs to a small class of progenitors of cataclysmic variable stars which on a time-scale of 10(8)-10(10) yr, may develop cataclysmic activity.

引用

页码：100 / 114

页数：15

共 38 条

[1]

ACKER A, 1990, ASTRON ASTROPHYS, V233, pL21

[2]

[Anonymous], 1989, S AFRICAN ASTRON OBS

[3] DIRECT OPTICAL OBSERVATIONS OF THE SECONDARY COMPONENT OF UU SAGITTAE [J].