2006A&A...458..113S


Query : 2006A&A...458..113S

2006A&A...458..113S - Astronomy and Astrophysics, volume 458, 113-120 (2006/10-4)

Multiband photometry towards the inner Galactic Bulge: extinction, atmospheric parameters, and metallicities.

SANTIAGO B.X., JAVIEL S.C. and PORTO DE MELLO G.F.

Abstract (from CDS):

We have obtained BVRI photometry for 21 stellar fields located in directions towards the central 3.5° of the Galaxy. Each field is 10x10 arcmin in size, and a total of ∼2x105 stars were measured. Previous analyses based on 2 Micron All Sky Survey (2MASS) data have shown that these directions have a relatively low extinction (AK≃0.25-0.30). The combined optical-infrared sample contains about 3.5x104 stars. This large dataset provides a more detailed extinction map within these surveyed areas than previously derived. The large number of colour indexes available also yielded estimates of effective temperatures and metallicities for the inner bulge stars. Extinction and effective temperature were estimated for each star based on comparing the observed colours to model predictions. The extinction-corrected colour magnitude diagrams indicate the presence of a broad red giant branch of inner bulge stars detached from the helium-burning red clump of both bulge and disc stars. The red giant stars belonging to the bulge form a wide sequence mostly due to variable metallicity. As previously done by other authors, we derived photometric metallicities by comparing the position of each bulge red giant to a set of templates based on Galactic globular clusters. We confirm the existence of regions with AK<0.30 in these fields, as attested by analysis of the stellar colours. The resulting metallicity distribution function is peaked at [Fe/H]≃-0.25 and extends to supersolar values up to [Fe/H]≃0.3. This distribution is similar among the 4 regions, with relatively small field-to-field variations within the central 1kpc. Our results are also in good agreement with the metallicity distributions from other authors, both photometric and spectroscopic. Put together, this result strongly limits the existence of an abundance gradient in the inner bulge.

Abstract Copyright:

Journal keyword(s): Galaxy: abundances - Galaxy: bulge - Galaxy: structure - Galaxy: stellar content - Galaxy: center - dust, extinction

VizieR on-line data: <Available at CDS (J/A+A/458/113): w02-22.dat w08-33.dat w15-255.dat w3595-30.dat>

Simbad objects: 19

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Number of rows : 19
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 NGC 3960 OpC 11 50 35 -55 40.7   9.07 8.3     ~ 123 0
2 HD 118280 * 13 35 52.6000814448 -00 57 53.622126432   10.22 8.82 8.054 7.379 K3III 16 0
3 HD 118330 PM* 13 36 14.6480848248 -00 55 51.561385536   7.59 7.04 6.749 6.438 F7V 47 0
4 IC 4651 OpC 17 24 51 -49 55.0           ~ 331 0
5 BD-00 3353 * 17 45 19.9645374120 -00 25 51.607860240 12.387 10.798 9.333 8.546 7.839 K2 26 0
6 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 13083 0
7 BD-00 3356 * 17 45 42.4478769504 -00 21 35.449005996 11.189 10.962 10.353 9.977 9.584 F1 19 0
8 NAME Baade Window reg 18 03.5 -30 01           ~ 576 3
9 TYC 447-98-1 * 18 43 33.6054749808 +00 19 40.739866032 11.788 11.678 11.122 10.797 10.462 ~ 10 0
10 TYC 447-527-1 * 18 43 51.4730915256 +00 22 58.478626668 13.212 12.529 11.583 11.034 10.408 ~ 9 0
11 HD 184965 * 19 36 54.7929562464 +00 07 32.124628020   8.93 8.55 8.293 8.046 A9IV 29 0
12 HD 185025 * 19 37 15.8301635544 +00 10 58.256832252 8.959 9.174 8.965 8.844 8.700 B7/9(III) 18 0
13 TYC 478-1348-1 * 19 37 16.3558915536 +00 12 05.564010204 14.511 12.489 10.748 9.783 8.885 ~ 17 0
14 TYC 511-1680-1 * 20 41 18.4637242992 +00 16 28.063754256 14.944 12.953 11.352 10.454 9.551 K2:III 16 0
15 BD-00 4069 PM* 20 41 35.8274270640 +00 16 35.878695168   10.48 9.79 9.451 9.054 K 7 0
16 SA 114-750 * 22 41 44.7035499504 +01 12 36.369967860 11.512 11.879 11.916 11.889 11.906 B9 41 0
17 BD+00 4910 PM* 22 42 07.5864771360 +01 16 49.012090356 11.416 11.479 10.909 10.596 10.287 ~ 7 0
18 TYC 568-1417-1 * 22 42 09.2892740472 +01 10 16.804144380 13.530 12.307 11.101 10.456 9.893 K1.5III 17 0
19 NAME Galactic Bulge reg ~ ~           ~ 3895 0

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2022.08.09-04:36:24

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