FIRST KEPLER RESULTS ON RR LYRAE STARS

被引：83

作者：

Kolenberg, K. ^{[1
]}

Szabo, R. ^{[2
]}

Kurtz, D. W. ^{[3
]}

Gilliland, R. L. ^{[4
]}

Christensen-Dalsgaard, J. ^{[5
]}

Kjeldsen, H. ^{[5
]}

Brown, T. M. ^{[6
]}

Benko, J. M. ^{[2
]}

Chadid, M. ^{[7
]}

Derekas, A. ^{[2
,8
]}

Di Criscienzo, M. ^{[9
]}

Guggenberger, E. ^{[1
]}

Kinemuchi, K. ^{[10
,11
]}

Kunder, A. ^{[12
]}

Kollath, Z. ^{[2
]}

Kopacki, G. ^{[13
]}

Moskalik, P. ^{[14
]}

Nemec, J. M. ^{[15
]}

Nuspl, J. ^{[2
]}

Silvotti, R. ^{[16
]}

Suran, M. D. ^{[17
]}

Borucki, W. J.

Koch, D.

Jenkins, J. M. ^{[18
]}

机构：

[1] Univ Vienna, Inst Astron, A-1180 Vienna, Austria

[2] Konkoly Observ Budapest, H-1525 Budapest, Hungary

[3] Univ Cent Lancashire, Jeremiah Horrocks Inst Astrophys, Preston PR1 2HE, Lancs, England

[4] Space Telescope Sci Inst, Baltimore, MD 21218 USA

[5] Aarhus Univ, Dept Phys & Astron, DK-8000 Aarhus C, Denmark

[6] Cumbres Observ Global Telescope, Goleta, CA 93117 USA

[7] Univ Nice Sophia Antipolis, Observ Cote Azur, UMR 6525, F-06108 Nice 02, France

[8] Univ Sydney, Sch Phys A28, Sydney Inst Astron, Sydney, NSW 2006, Australia

[9] INAF Osservatorio Astron Roma, I-00040 Rome, Italy

[10] Univ Florida, Bryant Space Sci Ctr 211, Dept Astron, Gainesville, FL 32611 USA

[11] Univ Concepcion, Dept Astron, Concepcion, Chile

[12] Cerro Tololo Interamer Observ, Natl Opt Astron Observ, La Serena, Chile

[13] Uniwersytetu Wroclawskiego, Inst Astron, PL-51622 Wroclaw, Poland

[14] Copernicus Astron Ctr, PL-00716 Warsaw, Poland

[15] Camosun Coll, Dept Phys & Astron, Victoria, BC, Canada

[16] INAF Osservatorio Astron Torino, I-10025 Pino Torinese, Italy

[17] Acad Romana, Astron Inst, RO-40557 Bucharest, Romania

[18] NASA, Ames Res Ctr, SETI Inst, Moffett Field, CA 94035 USA

来源：

ASTROPHYSICAL JOURNAL LETTERS | 2010年 / 713卷 / 02期

基金：

英国科学技术设施理事会; 奥地利科学基金会;

关键词：

stars: individual: (KIC5559631 (V783 Cyg); KIC3733346; (NR Lyr) and KIC7198959 (RR Lyr)); stars: oscillations; stars: variables: RR Lyrae; VARIABLE-STARS; MAGNETIC-FIELD; CATALOG; MODELS; PULSATIONS; PHOTOMETRY; CEPHEIDS;

D O I：

10.1088/2041-8205/713/2/L198

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present the first results of our analyses of selected RR Lyrae stars for which data have been obtained by the Kepler Mission. As expected, we find a significant fraction of the RRab stars to show the Blazhko effect, a still unexplained phenomenon that manifests itself as periodic amplitude and phase modulations of the light curve, on timescales of typically tens to hundreds of days. The long time span of the Kepler Mission of 3.5 yr and the unprecedentedly high precision of its data provide a unique opportunity for the study of RR Lyrae stars. Using data of a modulated star observed in the first roll as a showcase, we discuss the data, our analyses, findings, and their implications for our understanding of RR Lyrae stars and the Blazhko effect. With at least 40% of the RR Lyrae stars in our sample showing modulation, we confirm the high incidence rate that was only found in recent high-precision studies. Moreover, we report the occurrence of additional frequencies, beyond the main pulsation mode and its modulation components. Their half-integer ratio to the main frequency is reminiscent of a period doubling effect caused by resonances, observed for the first time in RR Lyrae stars.

引用

页码：L198 / L203

页数：6

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