Analysis of UBV photometry in selected area 133


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

ASTRONOMISCHE NACHRICHTEN, cilt.325, ss.726-732, 2004 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 325 Konu: 9
  • Basım Tarihi: 2004
  • Doi Numarası: 10.1002/asna.200310254
  • Dergi Adı: ASTRONOMISCHE NACHRICHTEN
  • Sayfa Sayıları: ss.726-732

Özet

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).