加强小行星增升的理由：白矮星微妙而多样的增升的证据
Strengthening the Case for Asteroidal Accrection: Evidence for Subtle and Diverse Disks at White Dwarfs
摘要：
据报道，斯皮策太空望远镜IRAC 3-8微米和AKARI IRC 2-4微米的测光结果显示，十颗含有光球重元素的白矮星;九颗相对较冷的恒星，含有光球钙，以及一颗较热的恒星，具有特殊的高碳丰度。在HE 2221-1630发现了大量的过量红外辐射，而在HE 0106-3253和HE 0307+0746发现了适度的过量辐射，这意味着后两颗恒星的星周尘埃环相对较窄（Δ r < 0.1 Rsol）。PG 1225-079可能存在7.9微米的过量，可能与G166-58一起代表具有大内孔的防尘环的子类。在白矮星上存在的衰减盘证实了它们的光球重元素和被破坏的小行星吸积之间的联系，表明许多被污染的白矮星可能含有轨道尘埃，即使是那些没有明显红外线过剩的白矮星。
英文摘要：
Spitzer Space Telescope IRAC 3-8 micron and AKARI IRC 2-4 micron photometry are reported for ten white dwarfs with photospheric heavy elements; nine relatively cool stars with photospheric calcium, and one hotter star with a peculiar high carbon abundance. A substantial infrared excess is detected at HE 2221-1630, while modest excess emissions are identified at HE 0106-3253 and HE 0307+0746, implying these latter two stars have relatively narrow (Delta r < 0.1 Rsol) rings of circumstellar dust. A likely 7.9 micron excess is found at PG 1225-079 and may represent, together with G166-58, a sub-class of dust ring with a large inner hole. The existence of attenuated disks at white dwarfs substantiates the connection between their photospheric heavy elements and the accretion of disrupted minor planets, indicating many polluted white dwarfs may harbor orbiting dust, even those lacking an obvious infrared excess.
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