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Astrophysical Bulletin

, Volume 63, Issue 2, pp 102–111 | Cite as

Andromeda IV: A new local volume very metal-poor galaxy

  • S. A. Pustilnik
  • A. L. Tepliakova
  • A. Y. Kniazev
  • A. N. Burenkov
Article

Abstract

And IV is a low surface brightness (LSB) dwarf galaxy at a distance of 6.1 Mpc, projecting close to M 31. In this paper the results of spectroscopy of the And IV two brightest HII regions with the SAO 6-m telescope (BTA) are presented. In spectra of both of them the faint line [OIII]λ4363 Å was detected and this allowed us to determine their O/H by the classical Te method. Their values for 12+log(O/H) are equal to 7.49±0.06 and 7.55±0.23, respectively. The comparison of the direct O/H calculations with the two most reliable semi-empirical and empirical methods shows the good consistency between these methods. For And IV absolute blue magnitude, MB = −12.6, our value for O/H corresponds to the ‘standard’ relation between O/H and LB for dwarf irregular galaxies (DIGs). And IV appears to be a new representative of the extremely metal-deficient gas-rich galaxies in the Local Volume. The very large range of M(HI) for LSB galaxies with close metallicities and luminosities indicates that simple models of LSBG chemical evolution are too limited to predict such striking diversity.

PACS numbers

95.75.Fg 95.85.Kr 98.38.Hv 98.52.Wz 98.58.Ay 98.58.Hf 98.62.Bj 

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Copyright information

© MAIK Nauka 2008

Authors and Affiliations

  • S. A. Pustilnik
    • 1
  • A. L. Tepliakova
    • 1
  • A. Y. Kniazev
    • 1
    • 2
  • A. N. Burenkov
    • 1
  1. 1.Special Astrophysical ObservatoryRussian Academy of SciencesNizhnij ArkhyzRussia
  2. 2.South African Astronomical ObservatoryCape TownSouth Africa

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