Stellar and circumstellar properties of the pre-main-sequence binary GV Tau from infrared spectroscopy

作者：Doppmann Greg W^*; Najita Joan R; Carr John S

来源：Astrophysical Journal, 2008, 685(1): 298-312.

DOI：10.1086/590328

• circumstellar matter
• infrared : stars
• stars : formation
• stars : fundamental parameters
• stars : individual (GV Tau)
• stars : late-type
• stars : low-mass, brown dwarfs
• stars : pre-main-sequence
• techniques : radial velocities
• techniques : spectroscopic

We report spatially resolved spectroscopy of both components of the low-mass pre-main-sequence binary GV Tau. High-resolution spectroscopy in the K and L bands is used to characterize the stellar properties of the binary and to explore the nature of the circumstellar environment. We find that the southern component, GV Tau S, is a radial velocity variable, possibly as a result of an unseen low-mass companion. The strong warm gaseous HCN absorption reported previously by Gibb and coworkers toward GV Tau S was not present during the epoch of our observations. Instead, we detect warm (similar to 500 K) molecular absorption with similar properties toward the northern infrared companion, GV Tau N. At the epoch of our observations, the absorbing gas toward GV Tau N was approximately at the radial velocity of the GV Tau molecular envelope, but it was redshifted with respect to the star by similar to 13 km s(-1). One interpretation of our results is that GV Tau N is also a binary and that most of the warm molecular absorption arises in a circumbinary disk viewed close to edge-on.

• 出版日期2008-9-20