Three very cool degenerate stars in Luyten common proper motion binaries - Implications for the age of the galactic disk

Details Three very cool degenerate stars in Luyten common proper motion binaries - Implications for the age of the galactic disk Three very cool degenerate stars in Luyten common proper motion binaries - Implications for the age of the galactic disk

Nov 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...346..454h&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 346, Nov. 1, 1989, p. 454-458. Research supported by NASA.

Other

10

Binary Stars, Cool Stars, Degenerate Matter, Galactic Evolution, Stellar Evolution, Stellar Motions, Stellar Luminosity, Stellar Magnitude, Stellar Spectrophotometry, Swan Bands, White Dwarf Stars

Scientific paper

During the course of a spectroscopic study of Luyten common proper motion (CPM) stars, spectrophotometric observations have been obtained of three binaries containing degenerate stars with estimated absolute magnitudes M(V) of about 16. Each of the three pairs consists of a yellow degenerate star primary and a DC 13 + secondary 1.4-2.3 mag fainter. One of the primary stars is spectral class DC 7, another is a sharp-lined DA 8, and the third shows peculiar broad absorption features which we interpret as pressure-shifted C2 Swan bands. The LP 701 - 69/70 system has survived for over 8 billion years without disruption by passing stars, despite its 1500 a.u. orbital major axis. The three cool degenerate companions nearly double the available sample of stars at the low-luminosity terminus of the white dwarf cooling sequence. These findings appear consistent with the conclusion that degenerate stars in the old disk population have not had time to evolve to a luminosity fainter than M(V) about 16.2.

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