Analysis of UBV photometry in selected area 133

Karataş Y., Bilir S., Karaali S., Ak S.

ASTRONOMISCHE NACHRICHTEN, vol.325, no.9, pp.726-732, 2004 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 325 Issue: 9
  • Publication Date: 2004
  • Doi Number: 10.1002/asna.200310254
  • Journal Name: ASTRONOMISCHE NACHRICHTEN
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.726-732
  • Istanbul University Affiliated: Yes

Abstract

We interpret the de-reddened UBV data for the field SA 133 to deduce the stellar density and metallicity distribution functions. The logarithmic local space density for giants, D* (0) = 6.40, and the agreement of the luminosity function for dwarfs and sub-giants with the one of Hipparcos confirms the empirical method used for their separation. The metallicity distribution for dwarfs gives a narrow peak at [Fe/H] = +0.13 dex, due to apparently bright limiting magnitude, V-o = 16.5, whereas late-type giants extending up to z similar to 4.5 kpc from the galactic plane have a multimodal distribution. The metallicity distribution for giants gives a steep gradient d[Fe/H] /dz = -0.75 dex kpc(-1) for thin disk and thick disk whereas a smaller value for the halo, i.e. d[Fe/H]/dz = -0.45 dex kpc(-1).