Table 2
Properties of the white dwarf WD J0820 from Gaia DR3 and measured abundances.
| Name: | SDSS J082019.49+253035.3 | |
| Gaia source identifier: | 679451907694651904 | |
| ICRS RA (deg): | 125.0812485217 | |
| ICRS Dec (deg): | 25.5097129895 | |
| G (mag) | 17.621 (0.001) | |
| Teff (K): | 11 900 (320) | |
| log ɡ (cm s−2): | 8.06 (0.04) | |
| MWD: | 0.619 (0.025) | |
| log q(∗) : | −4.99 | |
| u (mag) | 17.537 (0.009) | |
| ɡ (mag) | 17.521 (0.005) | |
| r (mag) | 17.754 (0.006) | |
| i (mag) | 17.950 (0.008) | |
| z (mag) | 18.185 (0.024) | |
| Element X1 | log n(X1)/n(He) | [X1/Fe] |
| H | −5.4 ± 0.10 | −3.35 |
| Ca | −6.8 ± 0.10 | 0.95 |
| Mg | −6.3 ± 0.14 | 0.24 |
| Fe | −6.6 ± 0.20 | 0.00 |
| Ti | −8.6 ± 0.20 | 0.55 |
| Si | −6.2 ± 0.20 | 0.34 |
| O | <−5.0 | <0.39 |
| Al | <−5.9 | <1.78 |
| Na | <−6.3 | <1.58 |
| Cr | <−6.5 | <1.91 |
| Ni | <−5.7 | <2.12 |
| log τCa (yr) | 6.18 | |
| log τMg (yr) | 6.31 | |
| log τFe (yr) | 6.05 | |
| log τTi (yr) | 6.09 | |
| log τSi (yr) | 6.28 | |
| log τO (yr) | 6.43 | |
| log τAl (yr) | 6.27 | |
| log τNa (yr) | 6.31 | |
| log τCr (yr) | 6.07 | |
| log τNi (yr) | 6.04 | |
Notes. RA and Dec use epoch 2016. Abundances measured for the WD are presented both in log number abundances relative to He and as abundances relative to solar values. Diffusion timescales from Koester et al. (2014, 2020).(*) q = log10 (MCVZ/MWD), the ratio between the mass of the convective zone of the WD, MCVZ, to the total mass of the WD, MWD.
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.