Possible Evidence of Hydrogen Emission in the First-overtone and Multimode RR Lyrae Variables

• Published in: The Astrophysical journal Vol. 909; no. 1; p. 25
• Main Authors: Duan 段, Xiao-Wei 晓苇, Chen 陈, Xiao-Dian 孝钿, Deng 邓, Li-Cai 李才, Yang 杨, Fan 帆, Liu 刘, Chao 超, Bhardwaj, Anupam, Zhang 张, Hua-Wei 华伟
• Format: Journal Article
• Language: English
• Published: Philadelphia IOP Publishing 01.03.2021
• Subjects: Algorithms; Astrophysics; Emission lines; Hydrogen; Pattern recognition; Photometric observations; Shock waves; Spectroscopy; Variable stars

Abstract The nature of shock waves in nonfundamental mode RR Lyrae stars remains a mystery because of limited spectroscopic observations. We apply a pattern recognition algorithm on spectroscopic data from SDSS and LAMOST and report the first evidence of hydrogen emission in first-overtone (RRc) and...