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


C.D.S. - SIMBAD4 rel 1.7 - 2019.12.10CET12:10:03

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 - 2020
#notes
1 Cl Blanco 1 OpC 00 04 07 -29 50.0           ~ 226 0
2 NGC 752 OpC 01 57 41 +37 47.1           ~ 526 0
3 NGC 1039 OpC 02 42 05 +42 45.7           ~ 364 0
4 Cl Melotte 20 OpC 03 26 42 +48 48.0           ~ 743 0
5 Cl Melotte 22 OpC 03 47 00 +24 07.0           ~ 2914 0
6 Cl Melotte 25 OpC 04 26 54.00 +15 52 00.0           ~ 2588 0
7 M 42 HII 05 35 17.3 -05 23 28           ~ 3664 0
8 NAME Ori A MoC 05 38 -07.1           ~ 2619 0
9 NGC 2264 OpC 06 40 58 +09 53.7     3.9     ~ 1553 1
10 M 41 OpC 06 46 01 -20 45.4   4.89 4.5     ~ 244 0
11 NGC 2422 OpC 07 36 35 -14 29.0           ~ 201 0
12 NGC 2516 OpC 07 58 04 -60 45.2           ~ 576 0
13 NGC 2632 OpC 08 40 24 +19 40.0           ~ 1184 0
14 IC 2391 OpC 08 40 32 -53 02.0           ~ 705 0
15 NGC 2682 OpC 08 51 18 +11 48.0           ~ 1991 0
16 Cl VDBH 99 OpC 10 37 54 -59 11.0           ~ 43 0
17 IC 2602 OpC 10 42 58 -64 24.0           ~ 541 0
18 NGC 3532 OpC 11 05 39 -58 45.2           ~ 262 0
19 Cl Melotte 111 OpC 12 25 06.00 +26 06 00.0           ~ 396 0
20 NGC 5822 OpC 15 04 28 -54 23.4     6.5     ~ 166 0
21 IC 4665 OpC 17 46 18 +05 43.0           ~ 307 0
22 NGC 6475 OpC 17 53 51 -34 47.6           ~ 329 0
23 NGC 6633 OpC 18 27 31.2 +06 34 12           ~ 316 0
24 NGC 7092 OpC 21 31 48 +48 26.0           ~ 185 0
25 NGC 7243 OpC 22 15 08 +49 53.9   6.54 6.4     ~ 97 0

    Equat.    Gal    SGal    Ecl

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2019.12.10-12:10:03

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