The spectrum of the brown dwarf candidate PC0025+0447
A spectrum of the cool dwarf star PC0025+0447 obtained with the Low Resolution Imaging Spectrograph at the Keck telescope yields an upper limit on the lithium to hydrogen ratio. The limit is temperature dependent and ranges from 5 X 10^(-10) for an effective temperature of 2500 K to 1 X 10^(-10) at 1900 K. A definitive spectrum of the star's chromospheric emission is presented, but the prominence of the Balmer series is due to the weak thermal emission of the photosphere, rather than extraordinary activity. PC0025+0447 seems more likely to be a cool main sequence star than a young brown dwarf.
© American Astronomical Society • Provided by the NASA Astrophysics Data System. Received 1993 December 23; revised 1994 January 21. The observations reported here were obtained at the W. M. Keck Observatory which is jointly operated by the California Institute of Technology and the University of California. We thank Don Schneider for his helpful comments as referee.
Published - 1994AJ____107_2222M.pdf