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Measuring Optical Extinction toward Young Stellar Objects Using Diffuse Interstellar Bands

Carvalho, Adolfo S. and Hillenbrand, Lynne A. (2022) Measuring Optical Extinction toward Young Stellar Objects Using Diffuse Interstellar Bands. Astrophysical Journal, 940 (2). Art. No. 156. ISSN 0004-637X. doi:10.3847/1538-4357/ac9d8e.

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Line-of-sight extinction estimates of 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). We then explore a method not previously applied to young stars utilizing diffuse interstellar bands (DIBs). In early-type stars, narrow correlations exist between the DIB equivalent widths and the column density of interstellar material, and therefore the line-of-sight extinction. Here, we measure the equivalent widths of the 5780 and 6614 Å DIB features in a sample of actively accreting YSOs, and apply a DIB-reddening calibration to estimate reddening and subsequently extinction. Our calibration is newly derived from a composite of available literature data and fully accounts for the scatter in these measurements. We also compare the DIBs-inferred optical line-of-sight extinction values with previous extinction estimates for our sample stars.

Item Type:Article
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Carvalho, Adolfo S.0000-0002-9540-853X
Additional Information:We thank Greg Herczeg and Michael Kuhn 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.
Group:Astronomy Department
Issue or Number:2
Record Number:CaltechAUTHORS:20221219-407313000.1
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:118477
Deposited By: Research Services Depository
Deposited On:19 Jan 2023 18:07
Last Modified:19 Jan 2023 18:07

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