Probing the anomalous extinction of four young star clusters: the use of colour-excess, main-sequence fitting and fractal analysis

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Table 2

Extinction laws from literature and results obtained from the TCD analysis.

Cluster	N_tot	N_ST	R_V	a_c[I]	R_V[I]	a_c[J]	R_V[J]	a_c[H]	R_V[H]	a_c[K]	R_V[K]

Berkeley 86	16^a	3^e	3.0ⁱ	1.20	3.39 ± 0.11	1.98	3.29 ± 0.11	2.24	2.87 ± 0.10	2.41	2.98 ± 0.10
NGC 2244	288^b	19^f	3.2–3.4^j	1.14	3.22 ± 0.11	2.02	3.36 ± 0.13	2.49	3.19 ± 0.10	2.54	3.13 ± 0.22
NGC 2264	179^c	24^g	3.1–5.2^k	1.04	2.94 ± 0.20	1.91	3.17 ± 0.08	2.39	3.07 ± 0.08	2.50	3.09 ± 0.11
NGC 6530	24^d	8^h	3.1–5.4^l	1.59	4.49 ± 0.14	3.45	5.73 ± 0.38	4.31	5.52 ± 0.19	5.01	6.19 ± 0.32

Notes. N_tot is the total number of studied stars and N_ST refers to those having available spectral type, the respective references to photometric and spectroscopic catalogues are: The extinction law references are:

^(a)

Deeg & Ninkov (1996);

^(b)

Park & Sung (2002);

^(c)

Sung et al. (1997);

^(d)

Sung et al. (2000);

^(e)

Forbes et al. (1992);

^(f)

Johnson (1962), Morgan et al. (1965), Conti & Leep (1974), Hoag & Smith (1959), Wolff et al. (2007);

^(g)

Morgan et al. (1965), Walker (1956), Young (1978);

^(h)

Hiltner et al. (1965).

⁽ⁱ⁾

Bhavya et al. (2007);

^(j)

Ogura & Ishida (1981), Pérez et al. (1987);

^(k)

Walker (1956), Pérez et al. (1987);

^(l)

Neckel & Chini (1981), Arias et al. (2007).

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