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首页> 外文期刊>The Astrophysical journal >SPITZER IRAC OBSERVATIONS OF WHITE DWARFS. I. WARM DUST AT METAL-RICH DEGENERATES
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SPITZER IRAC OBSERVATIONS OF WHITE DWARFS. I. WARM DUST AT METAL-RICH DEGENERATES

机译：白矮星的斯派泽·伊拉克（SPITZER IRAC）观测。 I.富含金属的金属粉尘产生的温热尘埃

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This paper presents the results of a Spitzer IRAC 3-8 μm photometric search for warm dust orbiting 17 nearby, metal-rich white dwarfs, 15 of which apparently have hydrogen-dominated atmospheres (type DAZ). G166-58, G29-38, and GD 362 manifest excess emission in their IRAC fluxes and the latter two are known to harbor dust grains warm enough to radiate detectable emission at near-infrared wavelengths as short as 2 μm. Their IRAC fluxes display differences compatible with a relatively larger amount of cooler dust at GD 362. G166-58 is presently unique in that it appears to exhibit excess flux only at wavelengths longer than about 5 μm. Evidence is presented that this midinfrared emission is most likely associated with the white dwarf, indicating that G166-5 8 bears circumstellar dust no warmer than T ～ 400 K. The remaining 14 targets reveal no reliable mid-infrared excess, indicating the majority of DAZ stars do not have warm debris disks sufficiently opaque to be detected by IRAC.
机译：本文介绍了Spitzer IRAC 3-8μm光度搜索的结果，该热搜索围绕着附近的17个富含金属的白矮星运行了暖尘，其中有15个显然具有氢为主的大气（DAZ类型）。 G166-58，G29-38和GD 362在其IRAC通量中表现出过量发射，并且已知后两者会携带足够温暖的尘埃颗粒，从而在短至2μm的近红外波长下辐射出可检测的发射。它们的IRAC通量显示出的差异与GD 362中相对大量的较冷灰尘兼容。G166-58目前是独特的，因为它仅在波长长于约5μm时才显示出过量通量。有证据表明，这种中红外发射极有可能与白矮星有关，这表明G166-5 8携带的周星尘不超过T〜400K。其余14个目标显示没有可靠的中红外过量，表明大部分DAZ恒星没有足够不透明的温暖碎片盘，无法被IRAC检测到。

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