Age and metallicity gradients in the Galactic Bulge : A differential study using HST/WFPC2 observations
(1999) In Astrophysics and Space Science 265(1-4). p.337-340- Abstract
We test for age and metallicity gradients in the Galactic Bulge between the two low extinction windows Baade's window (l = 1°.1 b = -4°.8) and Sagittarius-I (l = 1°.3 b = -2°.7). We derive a metallicity difference of ≤ 0.2 dex between BW and SGR-I window. This corresponds to a metallicity gradient of 1.3 dex kpc-1. This steep gradient is reconcilable with the existence of a short scale length inner component to the Bulge, most likely that prominent in the NIR, which perhaps forms a separate entity superimposed on the larger, optical Bulge. Through number counts in colour-magnitude diagram around the turnoff for several fields and clusters, extending over a range in galactic longitude we find no evidence for a significant... (More)
We test for age and metallicity gradients in the Galactic Bulge between the two low extinction windows Baade's window (l = 1°.1 b = -4°.8) and Sagittarius-I (l = 1°.3 b = -2°.7). We derive a metallicity difference of ≤ 0.2 dex between BW and SGR-I window. This corresponds to a metallicity gradient of 1.3 dex kpc-1. This steep gradient is reconcilable with the existence of a short scale length inner component to the Bulge, most likely that prominent in the NIR, which perhaps forms a separate entity superimposed on the larger, optical Bulge. Through number counts in colour-magnitude diagram around the turnoff for several fields and clusters, extending over a range in galactic longitude we find no evidence for a significant young stellar population in the Galactic Bulge. Previous suggestions of the existence of a significant young stellar population have most likely incorrectly identified the foreground disk stars.
(Less)
- author
- Feltzing, Sofia LU and Gilmore, Gerry
- publishing date
- 1999
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Astrophysics and Space Science
- volume
- 265
- issue
- 1-4
- pages
- 4 pages
- publisher
- Springer
- external identifiers
-
- scopus:0346553201
- ISSN
- 0004-640X
- DOI
- 10.1023/A:1002188616863
- language
- English
- LU publication?
- no
- id
- 681d5c7b-bbdc-4183-83ea-32eb6bdb063e
- date added to LUP
- 2021-02-15 13:57:49
- date last changed
- 2022-03-18 23:25:41
@article{681d5c7b-bbdc-4183-83ea-32eb6bdb063e, abstract = {{<p>We test for age and metallicity gradients in the Galactic Bulge between the two low extinction windows Baade's window (l = 1°.1 b = -4°.8) and Sagittarius-I (l = 1°.3 b = -2°.7). We derive a metallicity difference of ≤ 0.2 dex between BW and SGR-I window. This corresponds to a metallicity gradient of 1.3 dex kpc<sup>-1</sup>. This steep gradient is reconcilable with the existence of a short scale length inner component to the Bulge, most likely that prominent in the NIR, which perhaps forms a separate entity superimposed on the larger, optical Bulge. Through number counts in colour-magnitude diagram around the turnoff for several fields and clusters, extending over a range in galactic longitude we find no evidence for a significant young stellar population in the Galactic Bulge. Previous suggestions of the existence of a significant young stellar population have most likely incorrectly identified the foreground disk stars.</p>}}, author = {{Feltzing, Sofia and Gilmore, Gerry}}, issn = {{0004-640X}}, language = {{eng}}, number = {{1-4}}, pages = {{337--340}}, publisher = {{Springer}}, series = {{Astrophysics and Space Science}}, title = {{Age and metallicity gradients in the Galactic Bulge : A differential study using HST/WFPC2 observations}}, url = {{http://dx.doi.org/10.1023/A:1002188616863}}, doi = {{10.1023/A:1002188616863}}, volume = {{265}}, year = {{1999}}, }