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Title:
New spectrophotometry of the extremely cool proper motion star LHS 2924
Authors:
Liebert, J.; Boroson, T. A.; Giampapa, M. S.
Affiliation:
AA(Steward Observatory, Tucson, AZ), AB(Mount Wilson and Las Campanas Observatories, Pasadena, CA), AC(National Solar Observatory, Tucson, AZ)
Publication:
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 282, July 15, 1984, p. 758-762. (ApJ Homepage)
Publication Date:
07/1984
Category:
Astronomy
Origin:
STI
NASA/STI Keywords:
H ALPHA LINE, RADIAL VELOCITY, STELLAR MOTIONS, STELLAR SPECTROPHOTOMETRY, STELLAR TEMPERATURE, BROWN DWARF STARS, CHARGE COUPLED DEVICES, DWARF STARS, HIGH RESOLUTION, LATE STARS, MAIN SEQUENCE STARS, PECULIAR STARS, RADIATION DETECTORS
DOI:
10.1086/162259
Bibliographic Code:
1984ApJ...282..758L

Abstract

Improved spectrophotometric scans are presented for this very faint, red, large-proper motion star which has a peculiar spectrum. The Palomar Observatory 5 meter CCD spectrum shows the clear presence of VO λ7400 and λ7900. However, the TiO and hydride bands and the Na I and K I lines appear relatively weaker over the spectrum of LHS 2924 than they do in the benchmark low-luminosity star VB 10. A high-resolution observation with the MMT echelle spectrograph shows very weak Hα emission, at best. These and other recent results eliminate all previously considered explanations of the nature of LHS 2924 other than a very cool, main-sequence star or sub-stellar-mass "brown dwarf." The weakness of Hα emission tends to indicate that the star is an old, main-sequence object.

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