Infrared photometry and the atmospheric composition of cool white dwarfs - The lowest luminosity candidates

Details Infrared photometry and the atmospheric composition of cool white dwarfs - The lowest luminosity candidates Infrared photometry and the atmospheric composition of cool white dwarfs - The lowest luminosity candidates

Jun 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...246l..73l&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 246, June 1, 1981, p. L73-L76.

Astronomy and Astrophysics

Astrophysics

21

Atmospheric Composition, Infrared Photometry, Infrared Spectrophotometers, Stellar Atmospheres, Stellar Luminosity, Stellar Spectrophotometry, White Dwarf Stars, Abundance, Flux Density, Helium, Hydrogen, Stellar Temperature

Scientific paper

JHK fluxes for a selection of the lowest luminosity white dwarf candidates are obtained, primarily to search for the pressure-induced H2 dipole opacity in the 1-2 micron region. The colors are compared with predictions of hydrogen- and helium-rich atmosphere models by Mould and Liebert (1978). Most of the observed stars show no evidence for strong H2 opacity. However, the most important low luminosity candidate, LP 131-66, has significantly weak JHK fluxes, consistent with the presence of strong H2 opacity. Its energy distribution peaks sharply near 1 micron indicating that its red optical colors may be caused in part by flux redistribution away from infrared blanketing. Thus, while the surface temperature cannot be accurately estimated, the hypothesis is that LP 131-66 is substantially cooler than approximately 4000 K or lower in luminosity than an absolute bolometric magnitude of approximately +16 is less attractive.

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