Scholarlink

<p>Accurate distances to small, opaque Bok globules are difficult to obtain due to their compact sizes and lack of embedded standard candles. We estimate distances to five globules—CB4, CB24, CB56, CB60, and CB188—using a near-infrared (NIR) extinction technique applied to 2MASS photometry, combined with stellar distances from <i>Gaia</i> DR3 parallaxes. Extinction–distance profiles reveal distinct rises marking each cloud, yielding median distances of 766&#xa0;pc (CB4), 354&#xa0;pc (CB24), 483&#xa0;pc (CB56), 1143&#xa0;pc (CB60), and 926&#xa0;pc (CB188). Weighted-mean values agree within <InlineEquation ID="IEq1"> <EquationSource Format="MATHML"><math> <mn>8.0</mn> <mi mathvariant="normal">%</mi> </math></EquationSource> <EquationSource Format="TEX">$8.0\%$</EquationSource> </InlineEquation>, supporting the internal consistency of the method and interquartile-range-based uncertainties span 3–9% across the sample. Independent validation with Bayestar19 3D dust maps supports the CB4 and CB188 results. These refined distances provide an improved basis for future determinations of cloud masses, densities, and star-formation efficiencies, including the first robust measurement for CB56 and a revised upward distance for CB188.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Distance estimates to five bok globules using Gaia DR3 parallaxes and near-infrared photometry: validation with 3D dust maps

  • 期刊论文

  • 发表日期：

    2026年7月29日

查看全文
  • Rajat Subhra Paul,
  • Himadri Sekhar Das

摘要

Accurate distances to small, opaque Bok globules are difficult to obtain due to their compact sizes and lack of embedded standard candles. We estimate distances to five globules—CB4, CB24, CB56, CB60, and CB188—using a near-infrared (NIR) extinction technique applied to 2MASS photometry, combined with stellar distances from Gaia DR3 parallaxes. Extinction–distance profiles reveal distinct rises marking each cloud, yielding median distances of 766 pc (CB4), 354 pc (CB24), 483 pc (CB56), 1143 pc (CB60), and 926 pc (CB188). Weighted-mean values agree within 8.0 % $8.0\%$ , supporting the internal consistency of the method and interquartile-range-based uncertainties span 3–9% across the sample. Independent validation with Bayestar19 3D dust maps supports the CB4 and CB188 results. These refined distances provide an improved basis for future determinations of cloud masses, densities, and star-formation efficiencies, including the first robust measurement for CB56 and a revised upward distance for CB188.