Asset Details
Do you wish to reserve the book?
Accretion variability in RU Lup
Hey, we have placed the reservation for you!
By the way, why not check out events that you can attend while you pick your title.
Oops! Something went wrong.
Looks like we were not able to place the reservation. Kindly try again later.
Are you sure you want to remove the book from the shelf?
Accretion variability in RU Lup
Do you wish to request the book?
Accretion variability in RU Lup
Please be aware that the book you have requested cannot be checked out. If you would like to checkout this book, you can reserve another copy
We have requested the book for you!
Your request is successful and it will be processed during the Library working hours. Please check the status of your request in My Requests.
Oops! Something went wrong.
Looks like we were not able to place your request. Kindly try again later.
Paper
Accretion variability in RU Lup
2022
Overview
The process of accretion in classical T Tauri stars (CTTSs) has been observed to vary on different timescales. Studying this variability is vital to understanding a star's evolution and provides insight into the complex processes at work within. Understanding the dichotomy between continuum veiling and emission line veiling is integral to accurately measuring the amount of veiling present in stellar spectra. Here, 15 roughly consecutive nights of optical spectroscopic data from the spectropolarimeter ESPaDOnS are utilised to characterise the short-term accretion activity in the CTTS, RU Lup, and investigate its relationship with the veiling in the LiI 6707A absorption line. The accretion-tracing HI Balmer series emission lines were studied and used to obtain the accretion luminosity (Lacc) and mass accretion rate (Macc) for each night, which vary by a factor of ~2 between the brightest and dimmest nights. We also measured the veiling using multiple photospheric absorption lines (NaI 5688A, MnI 6021A, and LiI 6707A) for each night. We find the LiI 6707A line provides measurements of veiling that produce a strong, positive correlation with Lacc in the star. When corrected for Li depletion, the average veiling measured in the LiI 6707A line is r_LiI(avg)~3.25+/-0.20, which is consistent with the other photospheric lines studied (r_avg~3.28+/-0.65). We measured short timescale variability in the Lacc and Macc that are intrinsic and not due to geometric effects. Upon comparing the changes in veiling and Lacc, we find a strong, positive correlation. This study provides an example of how this correlation can be used as a tool to determine whether a measured variability is due to extinction or an intrinsic change in accretion. As the determination of veiling is an independent process from measuring Lacc, their relationship allows further exploration of accretion phenomena in young stars.
Publisher
Cornell University Library, arXiv.org
Subject
