Table 6
NGC 6530: previous and current determinations of color excess, distance, and age.
| Reference | E(B − V ) |  |
d | Age |
|---|---|---|---|---|
| [mag] | [mag] | [pc] | [Myr] | |
| Trumpler (1930)ph | ⋯ | ⋯ | 1 090 | ⋯ |
| Sanford (1949)sp | ⋯ | ⋯ | 730 | ⋯ |
| Johnson et al. (1961)ph | 0.32 | 10.7 ± 0.3 | 1 400 | ⋯ |
| Penston (1964)p | ⋯ | ⋯ | ⋯ | ~1 |
| Lindoff (1968)sc | ⋯ | 11.91 | 1 560 | <7 |
| van Altena (1972)ph | 0.35 | 11.25 | 1 780 | 2 |
| Harris (1976)sp | ⋯ | ⋯ | ⋯ | 6.36 ± 0.34 |
| Kilambi (1977)ph | 0.34 | 10.7 | ⋯ | ⋯ |
| Sagar & Joshi (1978)ph | 0.35 | 11.3 | ⋯ | 2 |
| Chini & Neckel (1981)ph,sp | 0.36 ± 0.09 | 11.4 | ⋯ | ⋯ |
| Boehm-Vitense et al. (1984)sp | ⋯ | ⋯ | ⋯ | 5 ± 2 |
| Sagar et al. (1986)ph | ⋯ | ⋯ | ⋯ | ~2 |
| Battinelli & Capuzzo-Dolcetta (1991)p | 0.35 | ⋯ | 1 600 | ~2 |
| Strobel et al. (1992)p | 0.4 | 12.7 | ⋯ | ~3 |
| Feinstein (1994)ph | 0.36 | 11.4 | 1 900 | ⋯ |
| van den Ancker et al. (1997)ph,sp | 0.30 | ⋯ | 1 800 ± 200 | ⋯ |
| Rastorguev et al. (1999)h | ⋯ | ⋯ | 1 270 | ⋯ |
| Robichon et al. (1999)h | ⋯ | ⋯ | ~763.36 | ⋯ |
| Sung et al. (2000)ph | 0.35 | 11.25 ± 0.1 | ⋯ | 1.5 |
| Baumgardt et al. (2000)h | ⋯ | ⋯ | ~917.43 | ⋯ |
| Loktin & Beshenov (2001)h | ⋯ | 9.005 ± 0.255 | ⋯ | ~7.5 |
| Prisinzano et al. (2005)ph | ⋯ | ⋯ | 1 250 | 2.3 |
| Kharchenko et al. (2005)h | ⋯ | ⋯ | 1 322 | ~4.7 |
| McSwain & Gies (2005)ph | 0.34** | 10.62 | ⋯ | ~7.4 |
| Zhao et al. (2006)ph | ⋯ | ⋯ | 1 330 | ~7.4 |
| Mayne & Naylor (2008)p | 0.32 | 10.34 | ⋯ | 2 |
| Kharchenko et al. (2009)h | 0.30 | ⋯ | 1 322 | ~4.7 |
| Kharchenko et al. (2013)h | 0.541 | ⋯ | 1 365 | ~4.7 |
| This work | 0.26 ± 0.05 | 11.76 ± 0.20 | 2 245 ± 215 | 4−6 |
Notes. (h) Results based on HIPPARCOS data. (p)Results based on published data. (ph)Results based on photometric data. (sc)Results based on synthetic clusters. (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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