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Measuring Optical Extinction Towards Young Stellar Objects Using Diffuse Interstellar Bands

Carvalho, Adolfo and Hillenbrand, Lynne (2022) Measuring Optical Extinction Towards Young Stellar Objects Using Diffuse Interstellar Bands. . (Unpublished)

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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.

Item Type:Report or Paper (Discussion Paper)
Related URLs:
URLURL TypeDescription Paper
Carvalho, Adolfo0000-0002-9540-853X
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.
Group:Astronomy Department
Subject Keywords:stars: pre-main sequence
Record Number:CaltechAUTHORS:20220517-214301863
Persistent URL:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:114788
Deposited By: George Porter
Deposited On:18 May 2022 15:56
Last Modified:18 May 2022 15:56

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