Open clusters - III. Fundamental parameters of B stars in NGC 6087, NGC 6250, NGC 6383, and NGC 6530 B-type stars with circumstellar envelopes

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Table 4

NGC 6250: previous and current determinations of color excess, distance, and age.


Reference	E(B − V )		d	age
	[mag]	[mag]	[pc]	[Myr]
Moffat & Vogt (1975)^ph	0.38 ± 0.02	9.92^*	950	⋯
Herbst (1977)^ph	0.37	10.05	⋯	14
Battinelli & Capuzzo-Dolcetta (1991)^c	⋯	⋯	⋯	~14
Kharchenko et al. (2005)^h	⋯	⋯	865	~26
McSwain & Gies (2005)^ph	0.35^**	9.69	⋯	~26
Piskunov et al. (2008)^h	0.35	10.77	⋯	⋯

This work	0.38 ± 0.16	10.55 ± 0.33	1 288 ± 210	~6

Notes. ^(c) Results based on catalogs. ^(h) Results based on HIPPARCOS data. ^(ph) Results based on photometric data. ^(*) The intrinsic distance modulus was calculated in this work, using (m_v − M_v) and E(B − V ) values published by Moffat & Vogt (1975) with R_v = 3.1. ^(**) The color excess E(B − V ) was calculated in this work, using the E(b− y) value given by McSwain & Gies (2005) and the relation E(b − y) = 0.74 E(B − V ).

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