期刊
ASTRONOMISCHE NACHRICHTEN
卷 336, 期 10, 页码 981-990出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/asna.201512214
关键词
Stars: chemically peculiar; stars: variables: general; techniques: photometric
资金
- Queen's University Belfast
- University of Keele
- University of St. Andrews
- University of Warwick
- University of Leicester
- Open University
- Isaac Newton Group
- Instituto de Astrofisica Canarias
- South African Astronomical Observatory
- STFC
- SoMoPro II Programme [3SGA5916]
- European Union
- South Moravian Region
- grant GA CR [7AMB12AT003, LH14300]
- Austrian Agency for International Cooperation in Education and Research [BG-03/2013, CZ-09/2014]
The magnetic chemically peculiar (CP2) stars of the upper main sequence are well-suited for investigating the impact of magnetic fields on the surface layers of stars, which leads to abundance inhomogeneities (spots) resulting in photometric variability. The light changes are explained in terms of the oblique rotator model; the derived photometric periods thus correlate with the rotational periods of the stars. CP2 stars exhibiting this kind of variability are classified as alpha(2) Canum Venaticorum (ACV) variables. We have analysed around 3 850 000 individual photometric WASP measurements of magnetic chemically peculiar (CP2) stars and candidates selected from the catalogue of Ap, HgMn, and Am stars, with the ultimate goal of detecting new ACV variables. In total, we found 80 variables, from which 74 are reported here for the first time. The data allowed us to establish variability for 23 stars which had been reported as probably constant in the literature before. Light curve parameters were obtained for all stars by a least-squares fit with the fundamental sine wave and its first harmonic. Because of the scarcity of Stromgren uvby beta measurements and the lack of parallax measurements with an accuracy better than 20%, we are not able to give reliable astrophysical parameters for the investigated objects. (C) 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据