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
中科院分区:
文献类型:
--
作者:
Bianchi L
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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影响因子:
4.8
作者:
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通讯作者:
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影响因子:
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作者:
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DOI:
10.1111/j.1365-2966.2011.19923.x
发表时间:
2012
影响因子:
4.8
作者:
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通讯作者:
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作者:
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