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Sofia Feltzing

Professor

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Age and metallicity gradients in the Galactic Bulge : A differential study using HST/WFPC2 observations

Författare

  • Sofia Feltzing
  • Gerry Gilmore

Summary, in English

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.

Publiceringsår

1999

Språk

Engelska

Sidor

337-340

Publikation/Tidskrift/Serie

Astrophysics and Space Science

Volym

265

Issue

1-4

Dokumenttyp

Artikel i tidskrift

Förlag

Springer

Ämne

  • Astronomy, Astrophysics and Cosmology

Aktiv

Published

ISBN/ISSN/Övrigt

  • ISSN: 0004-640X