A search for solar-like oscillations and granulation in α Cen A

被引：32

作者：

Kjeldsen, H ^{[1
]}

Bedding, TR

Frandsen, S

Dall, TH

机构：

[1] Aarhus Univ, Danmarks Grundforskningsfond, Teoret Astrofys Ctr, DK-8000 Aarhus C, Denmark

[2] Aarhus Univ, Inst Phys & Astron, DK-8000 Aarhus, Denmark

[3] Univ Sydney, Sch Phys, Chatterton Astron Dept, Sydney, NSW 2006, Australia

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 1999年 / 303卷 / 03期

关键词：

Sun; atmosphere; oscillations; stars; individual; alpha Cen A (HR 5459); Procyon; (HR; 2943);

D O I：

10.1046/j.1365-8711.1999.02254.x

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We report the most sensitive search yet made for solar-like oscillations. We observed the star alpha Cen A in Balmer-line equivalent widths over six nights with both the 3.9-m Anglo-Australian Telescope and the ESO 3.6-m telescope. We set an upper limit on oscillations of 1.4 times solar and found tentative evidence for p-mode oscillations. We also found a power excess at low frequencies which has the same slope and strength as the power seen from granulation in the Sun. We therefore suggest that we have made the first detection of temporal fluctuations caused by granulation ire a solar-like star.

引用

页码：579 / 587

页数：9

共 32 条

[1] In-flight performance of the virgo luminosity oscillations imager aboard SOHO [J].

Appourchaux, T ;

Andersen, BN ;

Frohlich, C ;

Jimenez, A ;

Telljohann, U ;

Wehrli, C .

SOLAR PHYSICS, 1997, 170 (01) :27-41

[2]

Arentoft T, 1998, ASTRON ASTROPHYS, V338, P909

[3]

BALDRY IK, 1999, IN PRES MNRAS

[4]

Bedding T. R., 1998, Astronomical Society of the Pacific Conference Series, V154, P301

[5] Measuring stellar oscillations using equivalent widths of absorption lines [J].

Bedding, TR ;

Kjeldsen, H ;

Reetz, J ;

Barbuy, B .

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 1996, 280 (04) :1155-1161

[6]

Bedding TR, 1995, ASTR SOC P, V83, P109

[7]

BEDDING TR, 1998, P 10 CAMBR WORKSH CO, pCD741

[8] THE EFFECTIVENESS OF OSCILLATION FREQUENCIES IN CONSTRAINING STELLAR MODEL PARAMETERS [J].

BROWN, TM ;

CHRISTENSENDALSGAARD, J ;

WEIBELMIHALAS, B ;

GILLILAND, RL .

ASTROPHYSICAL JOURNAL, 1994, 427 (02) :1013-1034

[9] A radial velocity search for p-mode pulsations in eta Bootis [J].

Brown, TM ;

Kennelly, EJ ;

Korzennik, SG ;

Nisenson, P ;

Noyes, RW ;

Horner, SD .

ASTROPHYSICAL JOURNAL, 1997, 475 (01) :322-327

[10] A SEARCH FOR SOLAR-LIKE OSCILLATIONS IN ALPHA-CENTAURI-A [J].

BROWN, TM ;

GILLILAND, RL .

ASTROPHYSICAL JOURNAL, 1990, 350 (02) :839-845

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