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Discovery of WTTS candidates in high-galactic latitude translucent molecular clouds

Chinese Science Bulletin 1999年第23期44卷 2145-2149页

作者： Jinzeng Li Jingyao Hu Wenping Chen Chinese Acad Sci Beijing Astron Observ Beijing 100012 Peoples R China Natl Cent Univ Inst Astron Chungli 32054 Taiwan

The results of the survey of low-mass star formation in high-galactic latitude molecular clouds, especially those of the translucent category, based on the ROSAT All-Sky Survey are presented. Six new WTTS candidates have been discovered at high-galactic latitude, a-mong which, two are found to be possibly associated with translucent molecular clouds MBM

关键词： stars formation-stars pre-main sequence-ISM clouds.

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Optical Spectroscopic Monitoring Observations of a T Tauri Star V409 Tau

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International Journal of Astronomy and Astrophysics 2019年第3期9卷 321-334页

作者： Hinako Akimoto Yoichi Itoh Nishi-Harima Astronomical Observatory Center for Astronomy University of Hyogo Hyogo Japan

We report the results of optical spectroscopic monitoring observations of a T Tauri star, V409 Tau. A previous photometric study indicated that this star experienced dimming events due to the obscuration of light from the central star with a distorted circumstellar disk. We conducted medium-resolution (R ~10,000) spectroscopic observations with 2-m Nayuta telescope at Nishi-Harima Astronomical Observatory. Spectra were obtained in 18 nights between November 2015 and March 2016. Several absorption lines such as Ca I and Li, and the Hαemission line were confirmed in the spectra. The Ic-band magnitudes of V409 Tau changed by approximately 1 magnitude during the observation epoch. The equivalent widths of the five absorption lines are roughly constant despite changes in the Ic-band magnitudes. We conclude that the light variation of the star is caused by the obscuration of light from the central star with a distorted circumstellar disk, based on the relationship between the equivalent widths of the absorption lines and the Ic-band magnitudes. The blue component of the Hαemission line was dominant during the observation epoch, and an inverse P Cygni profile was observed in eight of the spectra. The time-variable inverse P Cygni profile of the Hαemission line indicates unsteady mass accretion from the circumstellar disk to the central star.

关键词： Star Formation pre-main Sequence Stars T Tauri Stars

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