Discovery of a Bow-Shock Nebula around the Z Cam-type Cataclysmic Variable SY Cancri

Howard E. BondPenn State UniversitySTScI, Calvin CarterDallas, TX, David F. ElmoreNational Solar Observatory, Peter GoodhewDeep Space Imaging Network, Dana PatchickDeep Sky Hunters Consortium, Jonathan TalbotStark Bayou Observatory
{"title":"Discovery of a Bow-Shock Nebula around the Z Cam-type Cataclysmic Variable SY Cancri","authors":"Howard E. BondPenn State UniversitySTScI, Calvin CarterDallas, TX, David F. ElmoreNational Solar Observatory, Peter GoodhewDeep Space Imaging Network, Dana PatchickDeep Sky Hunters Consortium, Jonathan TalbotStark Bayou Observatory","doi":"arxiv-2409.06835","DOIUrl":null,"url":null,"abstract":"We report the serendipitous discovery of a bow-shock nebula around the\ncataclysmic variable (CV) SY Cancri. In addition, SY Cnc lies near the edge of\na faint Halpha-emitting nebula with a diameter of about 15'. The orientation of\nthe bow shock is consistent with the direction of SY Cnc's proper motion.\nNebulae are extremely rare around CVs, apart from those known to have undergone\nclassical-nova (CN) outbursts; bow shocks and off-center nebulae are even more\nunusual. Nevertheless, the properties of SY Cnc and its nebulosity are\nstrikingly similar to those of V341 Ara, another CV that is also associated\nwith a bow shock and is likewise off-center with respect to its faint Halpha\nnebula. Both stars are binaries with optically thick accretion disks, belonging\nto the classes of Z Cam CVs or nova-like variables. We discuss three scenarios\nto explain the properties of the nebulae. They may have resulted from chance\nencounters with interstellar gas clouds, with the stars leaving in their wakes\nmaterial that is recombining after being photoionized by UV radiation from the\nCVs. Alternatively, the large nebulae could be ejecta from unobserved CN\noutbursts in the recent past, which have been decelerated through collisions\nwith the interstellar medium (ISM), while the stars continue to snowplow\nthrough the gas. Or the faint Halpha nebulae may be ambient ISM that was\nshock-ionized by a CN outburst in the past and is now recombining.","PeriodicalId":501068,"journal":{"name":"arXiv - PHYS - Solar and Stellar Astrophysics","volume":null,"pages":null},"PeriodicalIF":0.0000,"publicationDate":"2024-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"arXiv - PHYS - Solar and Stellar Astrophysics","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/arxiv-2409.06835","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 0

Abstract

We report the serendipitous discovery of a bow-shock nebula around the cataclysmic variable (CV) SY Cancri. In addition, SY Cnc lies near the edge of a faint Halpha-emitting nebula with a diameter of about 15'. The orientation of the bow shock is consistent with the direction of SY Cnc's proper motion. Nebulae are extremely rare around CVs, apart from those known to have undergone classical-nova (CN) outbursts; bow shocks and off-center nebulae are even more unusual. Nevertheless, the properties of SY Cnc and its nebulosity are strikingly similar to those of V341 Ara, another CV that is also associated with a bow shock and is likewise off-center with respect to its faint Halpha nebula. Both stars are binaries with optically thick accretion disks, belonging to the classes of Z Cam CVs or nova-like variables. We discuss three scenarios to explain the properties of the nebulae. They may have resulted from chance encounters with interstellar gas clouds, with the stars leaving in their wakes material that is recombining after being photoionized by UV radiation from the CVs. Alternatively, the large nebulae could be ejecta from unobserved CN outbursts in the recent past, which have been decelerated through collisions with the interstellar medium (ISM), while the stars continue to snowplow through the gas. Or the faint Halpha nebulae may be ambient ISM that was shock-ionized by a CN outburst in the past and is now recombining.
在 Z 凸轮型大灾变变星 SY Cancri 周围发现弓震星云
我们报告了在大灾变(CV)SY Cancri周围偶然发现的弓形震荡星云。此外,SY Cnc位于一个直径约为15英尺的暗淡的Halpha发射星云的边缘附近。CV周围的星云是非常罕见的,除了那些已知有下旋古典新星爆发的星云之外;弓震和偏离中心的星云就更加罕见了。然而,SY Cnc的性质及其星云物质与V341 Ara惊人地相似,V341 Ara是另一颗CV,它也与弓形冲击有关,并且同样偏离了其暗晕星云的中心。这两颗恒星都是具有光学厚吸积盘的双星,属于Z Cam CV或类新星变星。我们讨论了三种情况来解释星云的性质。它们可能是与星际气体云偶然相遇的结果,恒星留下的物质在被CV的紫外线辐射光电离后重新结合。或者,这些大星云可能是近期未被观测到的CN爆发产生的抛射物,它们在与星际介质(ISM)的碰撞中减速,而恒星则继续在气体中 "扫雪"。或者,暗淡的Halpha星云可能是过去被CN爆发冲击电离的环境ISM,现在正在重新聚合。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
求助全文
约1分钟内获得全文 求助全文
来源期刊
自引率
0.00%
发文量
0
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
确定
请完成安全验证×
copy
已复制链接
快去分享给好友吧!
我知道了
右上角分享
点击右上角分享
0
联系我们:info@booksci.cn Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号:481959085
Book学术官方微信