Using GALEX-SDSS-PanSTARRS-HST-Gaia to understand post-AGB evolution

Using GALEX-SDSS-PanSTARRS-HST-Gaia to understand post-AGB evolution
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使用 GALEX-SDSS-PanSTARRS-HST-Gaia 了解 AGB 后的演化

DOI:
10.1007/s10509-018-3369-z
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发表时间:
2018
影响因子:
1.9
通讯作者:
Bianchi L
Bianchi L
中科院分区:
物理与天体物理4区
文献类型:
--
作者:
Bianchi L

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具有演化程度较低的恒星的双星系统中的热WD是特别宝贵的天体物理探测器,未演化的伴星能够比AGB后天体通常更好地推导距离和年龄,因此也可以推导它们的半径和光度。但热白矮星 (WD) 在除紫外线以外的所有波长下都难以捉摸(Bianchi 等人,2011a)。从我们与 SDSS 匹配的 GALEX UV 源目录(Bianchi et al. 2011a,b, 2014, 2017)中,我们确定了数千个候选热 WD,包括由热 WD 和光谱类型从 A 到 M 的伴星组成的双星系统中的 WD。恒星参数的识别和初步表征基于从远紫外到 z 波段的光度 SED 分析。我们观察了使用哈勃太空望远镜 (HST) 进行 UV 选择的 WD,以更好地表征其恒星参数。我们获得了 (1) 使用 STIS 的紫外光谱,并将紫外光谱与光学 SDSS 光谱一起分析,以及 (2) 使用 WFC3 () 进行多波段成像,以测量二元系统中该对组件的角距和单独的 SED。在我们的 HST/WFC3 样本中,有 59 个具有晚型伴星的热 WD 双星,我们发现至少有十几个可能在没有交换质量的情况下演化。由于热成分对光通量的贡献通常无法检测或无法量化,UV STIS 光谱导致了对先前仅基于光谱的结果的修订。
Hot WDs in binary systems with a less evolved star are particularly invaluable astrophysical probes, the unevolved companion enabling better derivation of distance and age than is usually possible for post-AGB objects, and therefore also of their radius and luminosity. But hot white dwarfs (WD) are elusive at all wavelengths except the UV (Bianchi et al. 2011a). From our GALEX UV source catalogs (Bianchi et al. 2011a,b, 2014, 2017) matched to SDSS, we identified thousands of candidate hot WDs including WDs in binary systems consisting of a hot WD and a companion of spectral type from A to M. The identification and preliminary characterization of the stellar parameters is based on the analysis of the photometric SED from far-UV to z-band.We have observed subsamples of the UV-selected WDs with the Hubble Space Telescope (HST) to better characterize their stellar parameters. We obtained (1) UV spectroscopy with STIS and analyzed the UV spectra together with optical SDSS spectra, and (2) multi-band imaging with WFC3 () to measure angular separation and individual SEDs of the pair’s components in binary systems. In our HST/WFC3 sample of 59 hot-WD binaries with late-type companions, we found that at least a dozen have possibly evolved without exchanging mass. The UV STIS spectroscopy led to the revision of previous results based on optical spectra only, because of the often undetectable or unquantifiable contribution of the hot component to the optical fluxes.
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