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Published April 12, 2022 | Submitted
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Measuring Optical Extinction Towards Young Stellar Objects Using Diffuse Interstellar Bands


Line-of-sight extinction estimates to well-studied young T Tauri and Herbig Ae/Be stars are based on many different measurements and analysis methods. This has resulted in wide scatter among the published A_V values for the same star. In this work, we discuss the challenges in measuring extinction to actively accreting and especially outbursting young stellar objects (YSOs), and explore a method not previously applied to young stars, utilizing diffuse interstellar bands (DIBs). In early-type stars, narrow correlations exist between DIB equivalent widths and the column density of interstellar material, and therefore the line-of-sight extinction. Here, we measure equivalent widths of the 5780 Å and 6614 Å DIB features in a sample of actively accreting YSOs, and apply established DIB--reddening calibrations to derive reddening, and subsequently extinction. We also compare the DIBs-inferred optical line-of-sight extinction values with previous extinction estimates for our sample stars.

Additional Information

We thank Greg Herczeg for discussions and Chris Johns-Krull and Lisa Prato for access to several standard star spectra obtained at McDonald Observatory that were used in this analysis.

Attached Files

Submitted - 2204.06061.pdf


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August 20, 2023
October 24, 2023