Asteroseismological analysis of the ultra-massive ZZ Ceti stars BPM 37093, GD 518, and SDSS J0840+5222

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Table 2.

Main characteristics of BPM 37093.

Quantity	Spectroscopy	Asteroseismology
T_eff [K]	11 370 ± 500 ^(a)	11 650 ± 40
M_⋆/M_⊙	1.098 ± 0.1 ^(b)	1.16 ± 0.014
log g [cm s⁻²]	8.843 ± 0.05 ^(a)	8.970 ± 0.025
log(L_⋆/L_⊙)	–	−3.25 ± 0.01
log(R_⋆/R_⊙)	–	−2.234 ± 0.006
log(M_H/M_⋆)	–	−6 ± 0.26
log(M_He/M_⋆)	–	−3.8
M_cr/M_⋆	0.935 ^(a)	0.923
X_¹⁶O cent.	–	0.52
X_²⁰Ne cent.	–	0.34

Quantity	Measured	Asteroseismology

[s]	–	29.70
[s]	17.3 ± 0.9	17.63

Quantity	Astrometry (Gaia)	Asteroseismology

d [pc]	14.81 ± 0.01	11.38 ± 0.06
π [mas]	67.52 ± 0.04	87.87 ± 0.40

Notes. The second column corresponds to spectroscopic and astrometric results, whereas the third column presents results from the asteroseismological model of this work.

References.

^(a)

Nitta et al. (2016).

^(b)

Camisassa et al. (2019).

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