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2004MNRAS.354..727S - Mon. Not. R. Astron. Soc., 354, 727-736 (2004/November-1)
A population model of the solar neighbourhood thin disc white dwarfs.
SCHROEDER K.-P., PAULI E.-M. and NAPIWOTZKI R.
Abstract (from CDS):
To verify our synthetic sample, especially the WD cooling time-scale, we study the temperature distribution of a small but nearly complete, volume-limited sample of observed WDs, which we characterize by a single and simple indicator R6300: the number ratio of WDs with Teff< 6300K over those with Teff> 6300K. After determination of the bias owing to a residual incompleteness with cool WDs, we find a corrected value of R6300 of 0.68 (±0.24). This is in good agreement with our WD population model: its temperature distribution yields R6300= 0.77.
For a spherical volume around the Sun, with d < 100pc, our population model suggests a total of about 13700 WDs (omiting part of the WDs with a binary system origin, an estimated 7±2 per cent of the total count). A subsample, limited to magnitude 19.0 (as expected for the European Space Agency mission Gaia), would contain about 7750 WDs of this population model. With a less deep magnitude limit of B= 16.0, more typical of current observed WD samples (SN Ia Progenitor surveY; SPY), the number of objects is reduced to only ~1350. We use this specific synthetic subsample to test the completeness of the prospective SPY WD sample, which (with over 50 per cent of the candidates now observed) is already the largest sample of WDs with high-resolution spectra. We find that within d < 100pc and for B < 16.0 SPY will deliver a fairly complete (almost 80 per cent) sample.
Abstract Copyright: 2004 RAS
Journal keyword(s): stars: evolution - white dwarfs - Galaxy: disc - Galaxy: kinematics and dynamics
CDS comments: In Table 3 : WD 2336+079 is a misprint fo WD 2336-079.
Simbad objects: 109
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