λ Bootis stars in the SuperWASP survey

被引：7

作者：

Paunzen, E. ^{[1
]}

Skarka, M. ^{[1
]}

Walczak, P. ^{[2
,3
]}

Holdsworth, D. L. ^{[4
]}

Smalley, B. ^{[4
]}

West, R. G. ^{[5
]}

Janik, J. ^{[1
]}

机构：

[1] Masaryk Univ, Dept Theoret Phys & Astrophys, CZ-61137 Brno, Czech Republic

[2] Uniwersytet Wroclawski, Inst Astron, PL-51622 Wroclaw, Poland

[3] Nicolaus Copernicus Astron Ctr, PL-00716 Warsaw, Poland

[4] Keele Univ, Astrophys Grp, Keele ST5 5BG, Staffs, England

[5] Univ Warwick, Dept Phys, Coventry CV4 7AL, W Midlands, England

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2015年 / 453卷 / 02期

关键词：

techniques: photometric; stars: chemically peculiar; stars: variables: delta Scuti; DELTA-SCUTI; SPECTRAL CLASSIFICATION; TEMPERATURE CALIBRATION; CHEMICAL-COMPOSITION; SPECTROSCOPIC SURVEY; PECULIAR STARS; PULSATION; SYSTEM; MODEL; RAVE;

D O I：

10.1093/mnras/stv1652

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We have analysed around 170 000 individual photometric WASP (Wide Angle Search for Planets) measurements of 15 well-established lambda Bootis stars to search for variability. The lambda Bootis stars are a small group of late-B to early-F, Pop I, stars that show moderate to extreme (surface) underabundances (up to a factor 100) of most Fe-peak elements, but solar abundances of lighter elements (C, N, O and S). They are excellent laboratories for the study of fundamental astrophysical processes such as diffusion, meridional circulation, stellar winds and accretion in the presence of pulsation. From the 15 targets, 8 are variable and 7 are apparently constant with upper limits between 0.8 and 3.0 mmag. We present a detailed time-series analysis and a comparison with previously published results. From an asteroseismologic study, we conclude that the found chemical peculiarities are most probably restricted to the surface.

引用

页码：1241 / 1248

页数：8

共 50 条

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