A 500 pc volume-limited sample of hot subluminous stars - I. Space density, scale height, and population properties

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Table 1

Previous population studies of hot subdwarf stars.

Survey and study	Field size (deg²)	Spectral type	Brightness limit (mag)^(a)	Number of stars	Within 500pc (Gaia DR3)	Scale height (pc)	Space density (10⁻⁷ stars pc⁻³)
SB^(*) (Heber 1986)	840	sdB	14.2(y/V)	12	6	190–220	40
KPD^(†) (Downes 1986)	1144	sdB/sdO	15.3(B)	31/20	1	175	20/7
KPD (Villeneuve et al. 1995b)	1144	sdB/sdO (H-rich)	15.0(V)	25	1		3.8 ± 1.7
PG^(‡) (Moehler et al. 1990a)	712	sdB	14.2(y)	11	5 ^(b)	250	10
PG (Theissen et al. 1993)	600	sdB	14.2(y)	11	3 ^(b)	$180_{- 60}^{+ 190}$ ${180_{ - 60}^{ + 190}}$	$19_{- 13.4}^{+ 32.4}$ ${19_{ - 13.4}^{ + 32.4}}$
PG (Saffer 1991; Saffer & Liebert 1995)	3 × 1200	sdB	15.4(y/V)	68	19 (b)	$285_{- 35}^{+ 120}$ ${285_{ - 35}^{ + 120}}$	7.5
PG (Villeneuve et al. 1995a)	10 714	sdB/sdO (H-rich)	15(y)	209	≈ 40	600±150	3±1

This work	All-sky	All considered	Volume-limited	305	305	281 ± 62	${6.15}_{- 0.53}^{+ 1.16}$ ${6.15_{ - 0.53}^{ + 1.16}}$

Notes. ^(*)Slettebak & Brundage (1971). ^(†)Downes (1986). ^(‡)Green et al. (1986). ^(a)Photometric magnitudes: Strømgren y, Johnson B, V. ^(b)Stars also in the sample of Villeneuve et al. (1995a).

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