Table 1 Astrometric and spectroscopic parameters of WD 0525+526

From: A hot white dwarf merger remnant revealed by an ultraviolet detection of carbon

Parameter

Value

Astrometric

 

 Right ascension (RA) (J2016) (deg)

82.46206

 Declination (Dec) (J2016) (deg)

52.66239

 Gaia Source ID

263082591016645504

 Parallax (mas)

25.56 ± 0.05

 Distance (pc)

39.12 ± 0.08

 μα (mas yr−1)

+364.193 ± 0.046

 μδ (mas yr−1)

−548.306 ± 0.034

Spectroscopic

 

 Teff (K)

20,820 ± 96

 logg (cm s−2)

9.05 ± 0.02

 Radius (×10−3 R⊙)

5.44 ± 0.11

 Mass (M⊙)

1.20 ± 0.01

 vl (km s−1)

+92.8 ± 0.6

 vISM (km s−1)

+18.7 ± 1.1

 log(C/H)

−4.62 ± 0.04

 log (He/H)

<−1.66

  1. The astrometric data are from Gaia DR3 at epoch J201619. The COS spectroscopic parameters are based on a mass–radius relation considering a carbon–oxygen core and thin helium and hydrogen layers5. The errors represent 1σ statistical uncertainties in the measurements. Here, μα is the proper motion in RA, μδ is the proper motion in Dec, R⊙ is the radius of the Sun, vl is the line-of-sight photospheric velocity not corrected for gravitational redshift, and vISM is the line-of-sight velocity of the interstellar cloud. The upper limit on the helium abundance was obtained from the optical spectrum14.
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