AI 中文总结
提出一种仅用Gaia和2MASS测光数据即可干净分离热星与冷星族群的新方法，具有低污染、不依赖消光、低损失的特点，可恢复被遮蔽的OB星并生成约2×10^5颗候选星表，有望将已知OB星样本扩展一个数量级。
AI 中文摘要
我们开发了一种测光方法，仅利用Gaia和2MASS测光数据即可产生干净的热（本质蓝色）星族群，其具有以下特点：[a]来自冷（本质红色）明亮天体的污染非常小（假阳性率<1%）；[b]不依赖于消光（仅受信噪比限制）；[c]对真实OB星的损失很小（假阴性率<10%）。将该方法应用于Gaia DR3数据，我们能够恢复被消光遮蔽的OB星，直至E(G_BP-G_RP)=5，并生成一个包含约2×10^5颗候选OB星的星表，该星表延伸至盾牌-半人马臂之外。该方法有可能将已知OB星样本扩展一个数量级，这将使我们对致密天体前身星族群（包括引力波源）的认识取得巨大飞跃。
英文摘要
We have developed a photometric method that produces clean hot (intrinsically blue) populations using Gaia and 2MASS photometry alone with [a] a very small (false positives < 1%) contamination from cool (intrinsically red) luminous sources, [b] independent of extinction (limited only by S/N), and [c] with only small losses (false negatives < 10%) of real OB stars. Applying the method to Gaia DR3 data we are able to recover extinguished OB stars down to E(G_BP-G_RP) = 5, producing a catalog of ~2x10^5 candidate OB stars that reaches beyond the Scutum-Centaurus arm. This method can potentially extend the sample of known OB stars by an order of magnitude, which would yield a large leap in our knowledge of the populations of compact-object progenitors, including gravitational-wave sources.
CommentsTo appear in Highlights of Spanish Astrophysics XIII, Proceedings of the XVII Scientific Meeting of the Spanish Astronomical Society held on 13-17 July 2026, in Tarragona, Spain. The generated file includes two animated pdfs, which require an Adobe-compatible viewer to activate the animation
