YNAO OpenIR  > 双星与变星研究组
ENIGMATIC RECURRENT PULSATIONAL VARIABILITY OF THE ACCRETING WHITE DWARF EQ LYN (SDSS J074531.92+453829.6)
Mukadam, AS1,2; Townsley, DM3; Szkody, P1,2; Gaansicke, BT4; Southworth, J5; Brockett, T3; Parsons, S4; Hermes, JJ6,7; Montgomery, MH6,7,8; Winget, DE6,7; Harrold, S6,7; Tovmassian, G9; Zharikov, S9; Drake, AJ10; Henden, A11; Rodriguez-Gil, P12,13; Sion, EM14; Zola, S15,16; Szymanski, T15; Pavlenko, E17; Aungwerojwit, A18,19; Qian SB(钱声帮)20; Mukadam, AS (reprint author), Univ Washington, Dept Astron, Seattle, WA 98195 USA.
发表期刊ASTRONOMICAL JOURNAL
2013-09
卷号146期号:3
DOI10.1088/0004-6256/146/3/54
产权排序第20完成单位
收录类别SCI
关键词Stars: Dwarf Novae Novae Cataclysmic Variables Stars: Oscillations Stars: Individual (Eq Lyn Stars: Variables: General sdssj074531.92+453829.6) White Dwarfs
摘要Photometric observations of the cataclysmic variable EQ Lyn (SDSS J074531.92+453829.6), acquired from 2005 October to 2006 January, revealed high-amplitude variability in the range 1166-1290 s. This accreting white dwarf underwent an outburst in 2006 October, during which its brightness increased by at least five magnitudes, and it started exhibiting superhumps in its light curve. Upon cooling to quiescence, the superhumps disappeared and it displayed the same periods in 2010 February as prior to the outburst within the uncertainties of a couple of seconds. This behavior suggests that the observed variability is likely due to nonradial pulsations in the white dwarf star, whose core structure has not been significantly affected by the outburst. The enigmatic observations begin with an absence of pulsational variability during a multi-site campaign conducted in 2011 January-February without any evidence of a new outburst; the light curve is instead dominated by superhumps with periods in the range of 83-87 minutes. Ultraviolet Hubble Space Telescope time-series spectroscopy acquired in 2011 March reveals an effective temperature of 15,400 K, placing EQ Lyn within the broad instability strip of 10,500-16,000 K for accreting pulsators. The ultraviolet light curve with 90% flux from the white dwarf shows no evidence of any pulsations. Optical photometry acquired during 2011 and Spring 2012 continues to reflect the presence of superhumps and an absence of pulsations. Subsequent observations acquired in 2012 December and 2013 January finally indicate the disappearance of superhumps and the return of pulsational variability with similar periods as previous data. However, our most recent data from 2013 March to May reveal superhumps yet again with no sign of pulsations. We speculate that this enigmatic post-outburst behavior of the frequent disappearance of pulsational variability in EQ Lyn is caused either by heating the white dwarf beyond the instability strip due to an elevated accretion rate, disrupting pulsations associated with the He II instability strip by lowering the He abundance of the convection zone, free geometric precession of the entire system, or appearing and disappearing disk pulsations.
项目资助者NSF [AST-1008734, AST-0909107, AST-0909182] ; NASA through Space Telescope Science Institute [HST-GO-12231.01-A] ; NASA [NAS 5-26555, NNX12AC96G, NNG05GF22G] ; Norman Hackerman Advanced Research Program [003658-0252-2009] ; Delaware Asteroseismic Research Center
语种英语
学科领域Astronomy & Astrophysics
文章类型Article
ISSN0004-6256
URL查看原文
WOS记录号WOS:000323302700011
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]CETI INSTABILITY STRIP ; EARTH TELESCOPE OBSERVATIONS ; BLANKETED MODEL ATMOSPHERES ; HUBBLE-SPACE-TELESCOPE ; DIGITAL SKY SURVEY ; CATACLYSMIC VARIABLES ; ORBITAL PERIOD ; GW-LIBRAE ; OPTICAL OBSERVATIONS ; ROTATING STARS
引用统计
被引频次:2[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/5878
专题双星与变星研究组
通讯作者Mukadam, AS (reprint author), Univ Washington, Dept Astron, Seattle, WA 98195 USA.
作者单位1.Department of Astronomy, University of Washington, Seattle, WA 98195-1580, USA
2.Apache Point Observatory, 2001 Apache Point Road, Sunspot, NM 88349-0059, USA
3.Department of Physics and Astronomy, The University of Alabama, Tuscaloosa, AL 35487, USA
4.Department of Physics, University of Warwick, Coventry CV4 7AL, UK
5.Astrophysics Group, Keele University, Staffordshire ST5 5BG, UK
6.Department of Astronomy, University of Texas at Austin, Austin, TX 78759, USA
7.McDonald Observatory, Fort Davis, TX 79734, USA
8.Delaware Asteroseismic Research Center, Mt. Cuba Observatory, Greenville, DE 19807, USA
9.Observatorio Astrónomico Nacional SPM, Instituto de Astronomía, Universidad Nacional Autónoma de México, Ensenada, BC, Mexico
10.Department of Astronomy and the Center for Advanced Computing Research, California Institute of Technology, Pasadena, CA 91225, USA
11.American Association of Variable Star Observers, 25 Birch Street, Cambridge, MA 02138, USA
12.Departamento de Astrofísica, Universidad de La Laguna, La Laguna, E-38204 Santa Cruz de Tenerife, Spain
13.Isaac Newton Group of Telescopes, Apartado de Correos 321, E-38700 Santa Cruz de La Palma, Spain
14.Department of Astronomy and Astrophysics, Villanova University, Villanova, PA 19085, USA
15.Astronomical Observatory, Jagiellonian University, ul. Orla 171, PL-30-244 Krakow, Poland
16.Mount Suhora Observatory, Pedagogical University, ul. Podchorazych 2, PL-30-084 Krakow, Poland
17.Crimean Astrophysical Observatory, Crimea 98409, Ukraine
18.Department of Physics, Faculty of Science, Naresuan University, Phitsanulok 65000, Thailand
19.ThEP Center, CHE, 328 Si Ayutthaya Road, Bangkok 10400, Thailand
20.National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, P.O. Box 110, 650011 Kunming, China
推荐引用方式
GB/T 7714
Mukadam, AS,Townsley, DM,Szkody, P,et al. ENIGMATIC RECURRENT PULSATIONAL VARIABILITY OF THE ACCRETING WHITE DWARF EQ LYN (SDSS J074531.92+453829.6)[J]. ASTRONOMICAL JOURNAL,2013,146(3).
APA Mukadam, AS.,Townsley, DM.,Szkody, P.,Gaansicke, BT.,Southworth, J.,...&Mukadam, AS .(2013).ENIGMATIC RECURRENT PULSATIONAL VARIABILITY OF THE ACCRETING WHITE DWARF EQ LYN (SDSS J074531.92+453829.6).ASTRONOMICAL JOURNAL,146(3).
MLA Mukadam, AS,et al."ENIGMATIC RECURRENT PULSATIONAL VARIABILITY OF THE ACCRETING WHITE DWARF EQ LYN (SDSS J074531.92+453829.6)".ASTRONOMICAL JOURNAL 146.3(2013).
条目包含的文件
文件名称/大小 文献类型 版本类型 开放类型 使用许可
ENIGMATIC RECURRENT (1862KB)期刊论文作者接受稿开放获取CC BY-NC-SA浏览 请求全文
个性服务
推荐该条目
保存到收藏夹
查看访问统计
导出为Endnote文件
谷歌学术
谷歌学术中相似的文章
[Mukadam, AS]的文章
[Townsley, DM]的文章
[Szkody, P]的文章
百度学术
百度学术中相似的文章
[Mukadam, AS]的文章
[Townsley, DM]的文章
[Szkody, P]的文章
必应学术
必应学术中相似的文章
[Mukadam, AS]的文章
[Townsley, DM]的文章
[Szkody, P]的文章
相关权益政策
暂无数据
收藏/分享
文件名: ENIGMATIC RECURRENT PULSATIONAL VARIABILITY OF THE ACCRETING WHITE DWARF EQ LYN (SDSS J074531.92+453829.6).pdf
格式: Adobe PDF
所有评论 (0)
暂无评论
 

除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。