LP 131-66 - A color class 'm' white dwarf

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Late Stars, M Stars, Stellar Spectrophotometry, White Dwarf Stars, Astronomical Catalogs, Atmospheric Models, Cool Stars, Stellar Atmospheres, Stellar Motions, Stellar Temperature

Scientific paper

A cool degenerate star with very red colors is reported. The colors are V = 17.77, B-V = 1.47, (V-R)J = 1.15, and (V-I)KM = 1.29. The B-V color is substantially redder than in any previous low-luminosity degenerate except the blanketed LP 701-29; yet in this case there are no obvious features in the optical spectrum. Comparison is made with BVI colors presented for other cool white dwarfs and with model-atmosphere predictions. Considerable scatter and evidence for blanketing are noted in the colors of the very cool stars. One interpretation of the extreme colors of LP 131-66 is that it has a temperature substantially below 4000 K, probably with a helium-rich atmosphere. An alternative possibility is that peculiar blanketing, not apparent in the spectroscopic observations, reddens the optical energy distribution, with the star having a somewhat higher temperature.

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