1994A&A...289..756N

Query : 1994A&A...289..756N

1994A&A...289..756N - Astronomy and Astrophysics, volume 289756-762 (1994/9-3)

The use of the (B-I) color index and applications of the (B-I) versus (B-V) relationship I. Open clusters.

NATALI F., NATALI G., POMPEI E. and PEDICHINI F.

Abstract (from CDS):

We present an analysis derived from the UBVRI photometry of 12 open clusters, that shows a linear relationship between the color indices (B-I) and (B-V). Due to this characteristic the (B-I) color index is a more sensitive estimator of the effective stellar temperatures with respect to the widely used (B-V), and it is less affected by the absorption bands of H2 molecules in low mass stars. Furthermore, from the two colors (B-I) vs. (B-V) diagrams we derive a new method yielding a parameter that estimates the interstellar reddening for each cluster.

Abstract Copyright: ∼

Journal keyword(s): open clusters and associations: general - dust: extinction - HR diagram - stars: low mass

Simbad objects: 14

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Number of rows : 14
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 NGC 869 OpC 02 18 57.0 +57 08 02           ~ 504 0
2 NGC 884 OpC 02 22 15.7 +57 08 59           ~ 503 0
3 Cl Melotte 22 OpC 03 46 38.0 +24 10 41           ~ 3679 0
4 Cl Melotte 25 OpC 04 30 27.4 +16 46 43           ~ 3309 0
5 NAME Orion Nebula Cluster OpC 05 35.0 -05 29           ~ 2514 0
6 NGC 2264 OpC 06 40 53.7 +09 52 32           ~ 1876 0
7 NGC 2632 OpC 08 39 58.4 +19 36 33           ~ 1733 0
8 NGC 2682 OpC 08 51 23.5 +11 48 54           ~ 2528 0
9 NGC 3532 OpC 11 05 33.9 -58 42 13           ~ 414 0
10 Cl Melotte 111 OpC 12 11 54.9 +25 16 36           ~ 520 0
11 NAME Ursa Major Moving Group MGr 12 32 +57.0           ~ 467 1
12 Cl Lynga 6 OpC 16 04 50.7 -51 57 19   10.28 9.5     ~ 95 0
13 M 4 GlC 16 23 35.22 -26 31 32.7           ~ 1978 0
14 NGC 7790 OpC 23 58 27.6 +61 12 33   9.18 8.5     ~ 286 0

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