Clues about the scarcity of stripped-envelope stars from the evolutionary state of the sdO+Be binary system φ Persei

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Table 1

Parameters for the subdwarf (sdO) and its companion (Be) in φ Persei according to Mourard et al. (2015) and references therein.





	sdO	Be




M [M_⊙]	1.2 ± 0.2	9.6 ± 0.3
T_eff [kK]	53 ± 3	29.3 ± 3
log₁₀ (L / L_⊙)	3.8 ± 0.13	4.16 ± 0.10
log₁₀ (g∕cm s⁻²)	4.2 ± 0.1








R_sdO∕R_Be	0.20 ± 0.01
P_orb [d]	126.7 ± 0.001
e	0

Notes. For each component we list the present-day mass M, effective temperature T_eff, luminosity L, and surface gravity g. We also list the ratio of their radii R_sdO∕R_Be, the orbital period P_orb, and the eccentricity e.

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