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 5

NGC 6383: previous and current determinations of color excess, distance, and age.


Reference	E(B − V )		d	Age
	[mag]	[mag]	[pc]	[Myr]
Trumpler (1930)^sp	⋯	⋯	2130	⋯
Zug (1937)^ph	⋯	⋯	2130	⋯
Sanford (1949)^sp	⋯	⋯	760	⋯
Eggen (1961)^ph	⋯	⋯	1259	⋯
Graham (1967)^ph	⋯	10.68 ± 0.54	1380	⋯
Lindoff (1968)^ph	⋯	10.5	1250	~20
Becker & Fenkart (1971)^c	0.26	10.92	1065	⋯
Fitzgerald et al. (1978)^ph,sp	0.33 ± 0.02	10.85	1500 ± 200	1.6 ± 0.4
Lloyd Evans (1978)^ph	0.35	10.6	1350	⋯
The et al. (1985)^ph	0.30 ± 0.01	⋯	1400 ± 150	⋯
Pandey et al. (1989)^ph	0.35	11.65	⋯	~4
Battinelli & Capuzzo-Dolcetta (1991)^sp	⋯	⋯	1380	~4
Feinstein (1994)^ph	0.33	⋯	1400	⋯
Rastorguev et al. (1999)^h	⋯	⋯	1180	⋯
Kharchenko et al. (2005)^h	⋯	⋯	985	~5
Paunzen et al. (2007)^ph	0.28^**	⋯	1700	4
Piskunov et al. (2008)^h	0.30	10.897	⋯	⋯
Rauw & De Becker (2008)^ph	0.32 ± 0.02	⋯	1300 ± 100	⋯

This work	0.51 ± 0.03	9.61 ± 0.38	834 ± 158	~3–10

Notes. ^(c) Results based on catalog data. ^(h) Results based on HIPPARCOS data. ^(ph)Results based on photometric data. ^(sp)Results based on spectroscopic data. ^(**)The color excess E(B − V ) was calculated in this work, using the published E(b − y) value and the relation E(b − y) = 0.74 E(B − V ).

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