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# Program information file
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PROGRAM_ID           2023A075
PROGRAM_TITLE        Spectroscopic monitoring of young stars with variable warm dust
PROGRAM_INV1         Lei Chen
PROGRAM_INV2         Agnes Kospal
PROGRAM_INV3         Peter Abraham
PROGRAM_INV4         Attila Moor
PROGRAM_INV5         Foteini Lykou
PROGRAM_SCICAT       stellar
PROGRAM_ABSTRACT_BEG
Studies of dust evolution in the inner region of Herbig star HD 169142 suggest formation and evolution of second-generation dust.  In order to study whether similar processes also happen in other young stars, we propose spectroscopic monitoring of four young stars with variable warm dust, using IRTF/SpeX, in order to study the nature of the dust components and the mechanism of variability.  While previous photometric monitoring suggest yearly variability, our SpeX monitoring will study varibility on monthly scale.  With the spectral coverage, we can study the dust temperature distribution and its temporal variation.  We will study the temporal changes in accretion rate, using the emission line as accretion tracer.  The spectroscopic data will also provide valuable complementary information to the analysis of infrared interferometric observations in the same period.
PROGRAM_ABSTRACT_END