THE DISCOVERY OF MAGNETICALLY CONTROLLED CIRCUMSTELLAR MATTER IN THE HELIUM-WEAK STARS HD-5737 AND HD-79158

被引：50

作者：

SHORE, SN

BROWN, DN

SONNEBORN, G

LANDSTREET, JD

BOHLENDER, DA

机构：

[1] NEW MEXICO INST MIN & TECHNOL,DEPT PHYS,ASTROPHYS RES CTR,SOCORRO,NM 87801

[2] ECOLE NORM SUPER,F-75231 PARIS 05,FRANCE

[3] OBSERV PARIS,DEMIRM,F-92190 MEUDON,FRANCE

[4] UNIV WASHINGTON,DEPT ASTRON,SEATTLE,WA 98195

来源：

ASTROPHYSICAL JOURNAL | 1990年 / 348卷 / 01期

关键词：

Stars:; individual; (HD; 5737; HD; 79158); Stars: magnetic; Stars: peculiar A; Ultraviolet: spectra;

D O I：

10.1086/168233

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We report the discovery, using combined IUE spectroscopy and Zeeman polarimetric magnetic field measurements, of magnetically controlled circumstellar material in two helium-weak stars. HD 5737 = α Sculptoris is, except for its extreme helium deficiency, similar to the He weak sn star HD 21699. We report a unique period for the magnetic and C IV and Si IV variations of 21.65 days. The effective (longitudinal) field nulls coincide extremely well with C IV line strength maxima. The magnetic field and equatorial trapped plasma are highly oblique to the rotation axis (about 70°), and the line variations appear to be stable. We have discovered similar magnetospheric variations in HD 79158 = 36 Lyncis, for which no period had been previously available. The period is 3.84 days, yet it too displays magnetic-equatorial plasma. The magnetospheric axis is highly oblique to the rotation axis, around 80°.

引用

页码：242 / 252

页数：11

共 33 条

[1]

ABT HA, 1979, AP J, V30, P485

[2]

ACUNA MH, 1983, PHYSICS JOVIAN MAGNE, P2

[3]

Barker P. K., 1982, ADV ULTRAVIOLET ASTR, P589

[4] MAGNETIC-FIELD MEASUREMENTS OF HELIUM-STRONG STARS [J].

BOHLENDER, DA ;

BROWN, DN ;

LANDSTREET, JD ;

THOMPSON, IB .

ASTROPHYSICAL JOURNAL, 1987, 323 (01) :325-337

[5] THE MAGNETIC-FIELDS OF THE HELIUM-WEAK B-STARS [J].

BORRA, EF ;

LANDSTREET, JD ;

THOMPSON, I .

ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES, 1983, 53 (01) :151-167

[6] MAGNETIC STARS [J].

BORRA, EF ;

LANDSTREET, JD ;

MESTEL, L .

ANNUAL REVIEW OF ASTRONOMY AND ASTROPHYSICS, 1982, 20 :191-220

[7] THE MAGNETICALLY CONTROLLED STELLAR WIND OF HD 21699 [J].

BROWN, DN ;

SHORE, SN ;

SONNEBORN, G .

ASTRONOMICAL JOURNAL, 1985, 90 (07) :1354-1362

[8] THE DISCOVERY OF NONTHERMAL RADIO-EMISSION FROM MAGNETIC BP-AP STARS [J].

DRAKE, SA ;

ABBOTT, DC ;

BASTIAN, TS ;

BIEGING, JH ;

CHURCHWELL, E ;

DULK, G ;

LINSKY, JL .

ASTROPHYSICAL JOURNAL, 1987, 322 (02) :902-908

[9]

GROOTE D, 1982, ASTRON ASTROPHYS, V116, P64

[10]

Hill T. W., 1983, PHYSICS JOVIAN MAGNE, P353, DOI DOI 10.1017/CBO9780511564574.012

← 1 2 3 4 →