HI emission from the red giant Y CVn with the VLA and FAST

• 来源期刊: 天文和天体物理学研究
• 年，卷（期）: 2017,（7）
• 页码范围: 39-46
• 页数: 8页
• 语种: 英文
• DOI: 10.1088/1674-4527/17/7/67

摘要

Imaging studies with the Very Large Array (VLA) have revealed H I emission associated with the extended circumstellar shells of red giants.We analyze the spectral map obtained on Y CVn,a J-type carbon star on the Asymptotic Giant Branch.The H I line profiles can be interpreted with a model of a detached shell resulting from the interaction of a stellar outflow with the local interstellar medium.We reproduce the spectral map by introducing a distortion along a direction corresponding to the star's motion in space.We then use this fitting to simulate observations expected from the Five-hundred-meter Aperture Spherical radio Telescope (FAST),and discuss its potential for improving our description of the outer regions of circumstellar shells.