标题： 从盖亚数据对奥里翁A中恒星形成约束 显示英文标题

标题： Constraints on star formation in Orion A from Gaia

摘要： 我们在贝叶斯框架内开发统计方法，以从原主序星种群的测光调查中推断恒星形成历史。 我们的程序包括校正由于消光在 magnitude 限制调查中的偏差，并使用具有个别消光测量值的恒星子集的分布。 我们还对未分辨双星进行了适度的校正。 我们将这些方法应用于奥里翁 A 分子云中具有盖亚测光数据的种群样本。 使用两组已建立的演化轨迹，我们发现，尽管由于消光，我们的样本在最年轻年龄时不完整，但在大约 0.3 到 5 Myr 的年龄范围内，奥里翁 A 中的恒星形成以相对恒定的速率进行，这与其它研究提出的多个恒星形成时期的观点相反。 对于一组尝试考虑强磁场效应的轨迹，也得到了类似的结果。 我们也没有发现支持“出生线”的明确证据，这种“出生线”会因低质量恒星首先出现在氘燃烧主序星上而产生，特别是使用磁性演化轨迹时更是如此。 虽然我们的方法是为处理盖亚数据而开发的，但它们可能对分析其他恒星形成区域的测光调查也有用。 显示英文摘要

摘要： We develop statistical methods within a Bayesian framework to infer the star formation history from photometric surveys of pre-main sequence populations. Our procedures include correcting for biases due to extinction in magnitude-limited surveys, and using distributions from subsets of stars with individual extinction measurements. We also make modest corrections for unresolved binaries. We apply our methods to samples of populations with Gaia photometry in the Orion A molecular cloud. Using two well-established sets of evolutionary tracks, we find that, although our sample is incomplete at youngest ages due to extinction, star formation has proceeded in Orion A at a relatively constant rate between ages of about 0.3 and 5 Myr, in contrast to other studies suggesting multiple epochs of star formation. Similar results are obtained for a set of tracks that attempt to take the effects of strong magnetic fields into account. We also find no evidence for a well-constrained "birthline" that would result from low-mass stars appearing first along the deuterium-burning main sequence, especially using the magnetic evolutionary tracks. While our methods have been developed to deal with Gaia data, they may be useful for analyzing other photometric surveys of star-forming regions.