2000A&A...364..455L


Query : 2000A&A...364..455L

2000A&A...364..455L - Astronomy and Astrophysics, volume 364, 455-466 (2000/12-2)

Reddenings and metallicities in the LMC and SMC from Stroemgren CCD photometry.

LARSEN S.S., CLAUSEN J.V. and STORM J.

Abstract (from CDS):

The individual reddenings for B stars in two fields in the Small Magellanic Cloud (SMC) and two fields in the Large Magellanic Cloud (LMC) are determined by means of Stroemgren uvby CCD photometry. In both LMC fields we find a foreground reddening of E(B-V)=0.085±0.02, and for the SMC fields we find E(B-V)=0.070±0.02. In addition to the foreground reddening we find contributions from reddening intrinsically in the Clouds up to E(B-V)∼0.21. The intrinsic contribution is not correlated with position within our ∼6'x4.5' CCD fields but varies in an essentially random way. Unless the reddening is measured for a particular object, it will be uncertain by ±0.035 (best case, far from the central bars) to more than ±0.10 (close to the central bars). The Stroemgren vby photometry has been used to derive metallicities for GK giant stars in the observed fields. Adopting average reddenings we obtain mean metallicities which are consistent with those found from spectroscopic studies of F and G supergiants (Westerlund, 1997, The Magellanic Clouds, Cambridge University Press), but with a considerable scatter in the derived metallicities, from [Fe/H]≃-2.0 to [Fe/H]>0. A significant fraction of the scatter is, however, due to reddening variations rather than being intrinsic. The possible existence of high metallicity stars should be investigated further using spectroscopic methods.

Abstract Copyright:

Journal keyword(s): galaxies: abundances - galaxies: ISM - galaxies: Magellanic Clouds - galaxies: photometry

VizieR on-line data: <Available at CDS (J/A+A/364/455): tab982.dat tab1433.dat tab11284.dat tab12578.dat>

Nomenclature: Tables: [LCS2000] HV 982 NNNN (Nos 1-8888), [LCS2000] HV 1433 NNNNN (Nos 1-11838), [LCS2000] HV 11284 NNNNN (Nos 1-12646), [LCS2000] HV 12578 NNNN (Nos 1-5367).

Status at CDS : All or part of tables of objects will not be ingested in SIMBAD.

Simbad objects: 8

goto View the references in ADS

Number of rows : 8
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 SV* HV 1433 EB* 00 47 11.1550404168 -73 41 19.862253168     15.506   15.621 ~ 7 0
2 SV* HV 11284 EB* 00 49 43.0820547360 -72 51 09.494795124 14.20 15.13 15.17 15.30 15.35 B1.5+B2 14 0
3 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 10197 1
4 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 6279 1
5 SV* HV 12578 EB* 05 21 31.4679962808 -66 21 14.633639208   15.84 15.747 16.18 15.871 ~ 7 0
6 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 15993 1
7 SV* HV 982 EB* 05 29 52.3071229680 -69 09 22.559372640   14.76 14.648 14.99 14.761 ~ 47 0
8 SN 1987A SN* 05 35 28.020 -69 16 11.07           SNIIpec 4692 2

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2022.05.24-01:03:09

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