1997A&AS..123...83J

Query : 1997A&AS..123...83J

1997A&AS..123...83J - Astron. Astrophys., Suppl. Ser., 123, 83-92 (1997/May-2)

An analysis of the currently available calibrations in Stroemgren photometry by using open clusters.

JORDI C., MASANA E., FIGUERAS F. and TORRA J.

Abstract (from CDS):

In recent years, several authors have revised the calibrations used to compute physical parameters (Mv, Teff, log g, [Fe/H]) from intrinsic colours in the uvbyHβ photometric system. For reddened stars, these intrinsic colours can be computed through the standard relations among colour indices for each of the regions defined by Stroemgren (1966ARA&A...4..433S) on the HR diagram. We present a discussion of the coherence of these calibrations for main-sequence stars. Stars from open clusters are used to carry out this analysis. Assuming that individual reddening values and distances should be similar for all the members of a given open cluster, systematic differences among the calibrations used in each of the photometric regions might arise when comparing mean reddening values and distances for the members of each region. To classify the stars into Stroemgren's regions we extended the algorithm presented by Figueras et al. (1991A&AS...87..319F) to a wider range of spectral types and luminosity classes. The observational ZAMS are compared with the theoretical ZAMS from stellar evolutionary models, in the range 6500-30000K. The discrepancies are also discussed.

Abstract Copyright: ∼

Journal keyword(s): stars: fundamental parameters - open clusters and associations: general - stars: distances - HR diagram - stars: general - techniques: photometric

Simbad objects: 25

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Number of rows : 25
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 Cl Blanco 1 OpC 00 03 24.7 -29 57 29           ~ 325 0
2 NGC 752 OpC 01 56 53.5 +37 47 38           ~ 642 0
3 NGC 1039 OpC 02 42 07.4 +42 43 19           ~ 430 0
4 Cl Melotte 20 OpC 03 26 28.1 +48 58 30           ~ 861 0
5 Cl Melotte 22 OpC 03 46 24.2 +24 06 50           ~ 3433 0
6 Cl Melotte 25 OpC 04 29 47.3 +16 56 53           ~ 3074 0
7 M 42 HII 05 35 17 -05 23.4           ~ 4073 0
8 NAME Ori A MoC 05 38 -07.1           ~ 3008 0
9 NGC 2264 OpC 06 40 52.1 +09 52 37           ~ 1793 0
10 M 41 OpC 06 45 59.8 -20 42 58   4.89 4.5     ~ 283 0
11 NGC 2422 OpC 07 36 35.3 -14 29 20           ~ 246 0
12 NGC 2516 OpC 07 58 06.5 -60 48 00           ~ 713 0
13 NGC 2632 OpC 08 40 13.0 +19 37 16           ~ 1564 0
14 IC 2391 OpC 08 41 10.1 -52 59 28           ~ 822 0
15 NGC 2682 OpC 08 51 23.0 +11 48 50           ~ 2342 0
16 Cl VDBH 99 OpC 10 38 12.7 -59 10 05           ~ 71 0
17 IC 2602 OpC 10 42 27.1 -64 25 34           ~ 675 0
18 NGC 3532 OpC 11 05 40.1 -58 42 25           ~ 350 0
19 Cl Melotte 111 OpC 12 24 03.4 +25 39 07           ~ 480 0
20 NGC 5822 OpC 15 04 12.2 -54 21 58           ~ 208 0
21 IC 4665 OpC 17 46 13.0 +05 36 54           ~ 372 0
22 NGC 6475 OpC 17 53 47.3 -34 50 28           ~ 384 0
23 NGC 6633 OpC 18 27 22.8 +06 36 54           ~ 385 0
24 NGC 7092 OpC 21 31 33.4 +48 14 49           ~ 223 0
25 NGC 7243 OpC 22 15 09 +49 49.8   6.54 6.4     ~ 121 0

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