ENIGMATIC RECURRENT PULSATIONAL VARIABILITY OF THE ACCRETING WHITE DWARF EQ LYN (SDSS J074531.92+453829.6)
文献类型：期刊论文
| 作者 | 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 |
| 刊名 | ASTRONOMICAL JOURNAL
 |
| 出版日期 | 2013-09 |
| 卷号 | 146期号:3 |
| 关键词 | novae, cataclysmic variables stars: dwarf novae stars: individual (EQ Lyn, SDSSJ074531.92+453829.6) stars: oscillations stars: variables: general white dwarfs |
| ISSN号 | 0004-6256 |
| 产权排序 | 第二十完成单位 |
| 通讯作者 | Mukadam, AS (reprint author), Univ Washington, Dept Astron, Seattle, WA 98195 USA. |
| 英文摘要 | 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. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 学科主题 | Astronomy & Astrophysics |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | 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 |
| 收录类别 | SCI |
| 原文出处 | http://iopscience.iop.org/article/10.1088/0004-6256/146/3/54/meta |
| 语种 | 英语 |
| WOS记录号 | WOS:000323302700011 |
| 源URL | [http://ir.ynao.ac.cn/handle/114a53/5878]  |
| 专题 | 云南天文台_双星与变星研究组 |
| 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 |
| 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.,...&Qian SB.(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). |
入库方式： OAI收割
来源：云南天文台
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