摘要
The Nearby Evolved Stars Survey (NESS) is a volume-complete sample of ∼850 Galactic evolved stars within 3 kpc at (sub-)mm wavelengths, observed in the CO J = (2-1) and (3-2) rotational lines, and the sub-mm continuum, using the James Clark Maxwell Telescope and Atacama Pathfinder Experiment. NESS consists of five tiers, based on distances and dust-production rate (DPR). We define a new metric for estimating the distances to evolved stars and compare its results to Gaia EDR3. Replicating other studies, the most-evolved, highly enshrouded objects in the Galactic Plane dominate the dust returned by our sources, and we initially estimate a total DPR of 4.7 × 10-5 M⊙ yr-1 from our sample. Our sub-mm fluxes are systematically higher and spectral indices are typically shallower than dust models typically predict. The 450/850 μm spectral indices are consistent with the blackbody Rayleigh-Jeans regime, suggesting a large fraction of evolved stars have unexpectedly large envelopes of cold dust.
原文 | 英語 |
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頁(從 - 到) | 1091-1110 |
頁數 | 20 |
期刊 | Monthly Notices of the Royal Astronomical Society |
卷 | 512 |
發行號 | 1 |
DOIs | |
出版狀態 | 已發佈 - 2022 5月 1 |
ASJC Scopus subject areas
- 天文和天體物理學
- 空間與行星科學