THE DUST PROPERTIES OF TWO HOT R CORONAE BOREALIS STARS AND A WOLF–RAYET CENTRAL STAR OF A PLANETARY NEBULA: IN SEARCH OF A POSSIBLE LINK-猫眼课题宝

行星状星云的两颗热 R 北冕星和一颗沃尔夫-拉耶特中央星的尘埃特性：寻找可能的联系

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发表时间：

2011

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作者：

G. Clayton;O. De Marco;B. Whitney;B. Babler;J. Gallagher;J. Nordhaus;A. Speck;M. Wolff;W. Freeman;K. A. Camp;W. Lawson;J. Roman;K. Misselt;M. Meade;G. Sonneborn;M. Matsuura;M. Meixner

我们展示了两颗热 R 北冕座 (RCB) 恒星的新斯皮策/IRS 光谱，一颗位于银河系，V348 Sgr，一颗位于大麦哲伦星云，HV 2671。这两个天体可能构成 RCB 恒星与行星状星云 (CSPNe) 晚期沃尔夫-拉叶 ([WCL]) 类中央恒星（例如 CPD -56° 8032）之间的联系，该联系很少或没有他们的大气中含有氢气。 HV 2671 和 V348 Sgr 是一个罕见子类的成员，其有效温度明显高于大多数 RCB 恒星，但具有缺氢和尘埃形成的特征，这些特征定义了较冷的 RCB 恒星。 [WC] CSPN 星 CPD −56° 8032 显示出双尘埃化学的证据，在中红外光谱中显示多环芳烃 (PAH) 和结晶硅酸盐。 HV 2671 显示出强烈的 PAH 排放，但没有结晶硅酸盐的迹象。 V348 Sgr 的光谱与 CPD -56° 8032 和 HV 2671 的光谱非常不同。在其他两颗恒星中强烈看到的 PAH 发射不存在。相反，光谱以大约 8.2μm 为中心的宽发射为主。 PAH 或硅酸盐均未识别出此功能。其他几颗冷 RCB 恒星、新星和渐近后巨分支恒星在红外光谱中也显示出类似的特征。 CPD -56° 8032 的中红外光谱显示出可能与 C60 相关的发射特征。另外两颗恒星没有显示出 C60 的证据。这些恒星周围尘埃的不同性质无助于我们建立可能表明共同起源的进一步联系。 Herschel/PACS 和 SPIRE 也检测到了 HV 2671。 V348 Sgr 和 CPD −56° 8032 已被 AKARI/远红外测量员探测到。这些数据与斯皮策、IRAS、两微米全天巡天和其他光度测量相结合，产生从可见光到远红外的光谱能量分布 (SED)。蒙特卡罗辐射传输模型被用来研究这些恒星周围的星周尘埃。 HV 2671 和 CPD −56° 8032 需要带有温尘的喇叭形内盘和带有冷尘的扩展扩散外壳，以适应其 SED。 V348 Sgr 的 SED 可以安装更小的磁盘和封套。在 HV 2671 和 CPD -56° 8032 周围推断的扩展扩散包层中的冷尘埃可能由质量损失事件期间扫过的星际介质组成。

We present new Spitzer/IRS spectra of two hot R Coronae Borealis (RCB) stars, one in the Galaxy, V348 Sgr, and one lying in the Large Magellanic Cloud, HV 2671. These two objects may constitute a link between the RCB stars and the late Wolf–Rayet ([WCL]) class of central stars of planetary nebulae (CSPNe), such as CPD −56° 8032, that has little or no hydrogen in their atmospheres. HV 2671 and V348 Sgr are members of a rare subclass that has significantly higher effective temperatures than most RCB stars, but shares the traits of hydrogen deficiency and dust formation that define the cooler RCB stars. The [WC] CSPN star, CPD −56° 8032, displays evidence of dual-dust chemistry showing both polycyclic aromatic hydrocarbons (PAHs) and crystalline silicates in its mid-IR spectrum. HV 2671 shows strong PAH emission but no sign of having crystalline silicates. The spectrum of V348 Sgr is very different from that of CPD −56° 8032 and HV 2671. The PAH emission seen strongly in the other two stars is not present. Instead, the spectrum is dominated by a broad emission centered at about 8.2 μm. This feature is not identified with either PAHs or silicates. Several other cool RCB stars, novae, and post-asymptotic giant branch stars show similar features in their IR spectra. The mid-IR spectrum of CPD −56° 8032 shows emission features that may be associated with C60. The other two stars do not show evidence of C60. The different nature of the dust around these stars does not help us in establishing further links that may indicate a common origin. HV 2671 has also been detected by Herschel/PACS and SPIRE. V348 Sgr and CPD −56° 8032 have been detected by AKARI/Far-Infrared Surveyor. These data were combined with Spitzer, IRAS, Two Micron All Sky Survey, and other photometry to produce their spectral energy distributions (SEDs) from the visible to the far-IR. Monte Carlo radiative transfer modeling was used to study the circumstellar dust around these stars. HV 2671 and CPD −56° 8032 require both a flared inner disk with warm dust and an extended diffuse envelope with cold dust to fit their SEDs. The SED of V348 Sgr can be fit with a much smaller disk and envelope. The cold dust in the extended diffuse envelopes inferred around HV 2671 and CPD −56° 8032 may consist of interstellar medium swept up during mass-loss episodes.

SPITZER SURVEY OF THE LARGE MAGELLANIC CLOUD, SURVEYING THE AGENTS OF A GALAXY'S EVOLUTION (SAGE). IV. DUST PROPERTIES IN THE INTERSTELLAR MEDIUM

DOI： 10.1088/0004-6256/136/3/919

发表时间： 2005-06

期刊：

The Astronomical Journal

影响因子： --

作者：

M. Meixner;K. Gordon;R. Indebetouw;J. Hora;B. Whitney;R. Blum;W. Reach;J. Bernard;M. Meade;B. Babler;C. Engelbracht;B. For;K. Misselt;U. Vijh;C. Leitherer;M. Cohen;E. Churchwell;F. Boulanger;J. Frogel;Y. Fukui;J. Gallagher;V. Gorjian;J. Harris;D. Kelly;A. Kawamura;Soyoung Kim;W. Latter;S. Madden;Ciska Markwick-Kemper;A. Mizuno;N. Mizuno;J. Mould;A. Nota;M. Oey;K. Olsen;T. Onishi;R. Paladini;N. Panagia;P. Pérez-González;H. Shibai;Sato Shuji;Linda J. Smith;L. Staveley-Smith;A. Tielens;T. Ueta;S. V. Dyk;K. Volk;M. Werner;D. Zaritsky

通讯作者：

THE DUST PROPERTIES OF TWO HOT R CORONAE BOREALIS STARS AND A WOLF–RAYET CENTRAL STAR OF A PLANETARY NEBULA: IN SEARCH OF A POSSIBLE LINK

行星状星云的两颗热 R 北冕星和一颗沃尔夫-拉耶特中央星的尘埃特性：寻找可能的联系

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