The spectrum of the brown dwarf candidate PC0025+0447

Details The spectrum of the brown dwarf candidate PC0025+0447 The spectrum of the brown dwarf candidate PC0025+0447

Jun 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aj....107.2222m&link_type=abstract

The Astronomical Journal (ISSN 0004-6256), vol. 107, no. 6, p. 2222-2225

Astronomy and Astrophysics

Astronomy

15

Brown Dwarf Stars, Celestial Bodies, Main Sequence Stars, Stellar Evolution, Stellar Spectrophotometry, Charge Coupled Devices, Emission Spectra, Stellar Magnitude, Stellar Spectra

Scientific paper

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.

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