The Formation Rate, Mass and Luminosity Functions of DA White Dwarfs from the Palomar Green Survey

Abstract

Spectrophotometric observations at high signal-to-noise ratio were obtained of a complete sample of 347 DA white dwarfs from the Palomar Green (PG) Survey. Fits of observed Balmer lines to synthetic spectra calculated from pure-hydrogen model atmospheres were used to obtain robust values of Teff, log g, masses, radii, and cooling ages. The luminosity function of the sample, weighted by 1/Vmax, was obtained and compared with other determinations. The mass distribution of the white dwarfs is derived, after important corrections for the radii of the white dwarfs in this magnitude-limited survey and for the cooling time scales. The formation rate of DA white dwarfs from the PG is estimated to be 0.6x10^(-12) pc^(-3) yr^(-1). Comparison with predictions from a theoretical study of the white dwarf formation rate for single stars indicates that >80% of the high mass component requires a different origin, presumably mergers of lower mass double degenerate stars. In order to estimate the recent formation rate of all white dwarfs in the local Galactic disk, corrections for incompleteness of the PG, addition of the DB-DO white dwarfs, and allowance for stars hidden by luminous binary companions had to be applied to enhance the rate. An overall formation rate of white dwarfs recently in the local Galactic disk of 1.15+/-0.25x10^(-12) pc^(-3) yr^(-1) is obtained. Two recent studies of samples of nearby Galactic planetary nebulae lead to estimates around twice as high. Difficulties in reconciling these determinations are discussed.

73 pages, 18 figures, accepted for publication in the ApJ Supplement

References in corpus (20)

• The u'g'r'i'z' Standard Star Network
• A Hipparcos census of the nearby OB associations
• Photometric and Spectroscopic Analysis of Cool White Dwarfs with Trigonometric Parallax Measurements
• A Catalog of Spectroscopically Identified White Dwarf Stars in the First Data Release of the Sloan Digital Sky Survey
• The True Incidence of Magnetism among Field White Dwarfs
• A Determination of the Local Density of White Dwarf Stars
• A Comparative Study of the Mass Distribution of Extreme Ultraviolet-Selected White Dwarfs
• On the Purity of the ZZ Ceti Instability Strip: Discovery of More Pulsating DA White Dwarfs on the Basis of Optical Spectroscopy
• Search for progenitors of supnernovae type Ia with SPY
• Diffusion and the occurrence of hydrogen shell flashes in helium white dwarf stars
• Indications of a Large Fraction of Spectroscopic Binaries Among Nuclei of Planetary Nebulae
• A Helium White Dwarf of Extremely Low Mass
• Heavy element abundance patterns in hot DA white dwarfs
• Re-defining the Empirical ZZ Ceti Instability Strip
• A comparison of DA white dwarf temperatures and gravities from FUSE Lyman line and ground-based Balmer line observations
• PG1115+166 - a long period DA+DB binary
• Binaries discovered by the SPY project. III. HE2209-1444: a massive, short period double degenerate
• Spectroscopic Analysis of the DAB White Dwarf PG 1115+166: An Unresolved DA + DB Degenerate Binary
• Projected rotational velocities of WD1614+136 and WD1353+409 - implications for the rate of galactic Type Ia supernovae
• Hidden Subluminous sd/wd among the FAUST UV sources toward OPHIUCHUS

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