‘Counterpart’ method for abundance determinations in H ii regions

Author： Pilyugin L. S.   Grebel E. K.   Mattsson L.  

Publisher： Oxford University Press

ISSN： 0035-8711

Source： Monthly Notices of the Royal Astronomical Society, Vol.424, Iss.3, 2012-08, pp. : 2316-2329

Disclaimer: Any content in publications that violate the sovereignty, the constitution or regulations of the PRC is not accepted or approved by CNPIEC.

Previous Menu Next

Abstract

ABSTRACTWe suggest a new way of determining abundances and electron temperatures in H ii regions from strong emission lines. Our approach is based on the standard assumption that H ii regions with similar intensities of strong emission lines have similar physical properties and abundances. A ‘counterpart’ for a studied H ii region may be chosen among H ii regions with well-measured abundances (reference H ii regions) by comparison of carefully chosen combinations of strong-line intensities. Then the abundances in the investigated H ii region can be assumed to be the same as those in its counterpart. In other words, we suggest to determine the abundances in H ii regions ‘by precedent’. To get more reliable abundances for the considered H ii region, a number of reference H ii regions are selected and then the abundances in the target H ii region are estimated through extrapolation/interpolation. We will refer to this method of abundance determination as the counterpart method or, for brevity, the C method. We define a sample of reference H ii regions and verify the validity of the C method. We find that this method produces reliable abundances. Finally, the C method is used to obtain the radial abundance distributions in the extended discs of the spiral galaxies M83, NGC 4625 and NGC 628.

Related content

The chemical abundance in M31 from H ii regions

By Zurita A.   Bresolin F.  

Monthly Notices of the Royal Astronomical Society, Vol. 427, Iss. 2, 2012-12 ,pp. : 1463-1481 (19)

Oxford University Press

Access to resources Recommend Favorite

Exploring the effects of high-velocity flows in abundance determinations in H ii regions: bidimensional spectroscopy of HH 204 in the Orion nebula1

By Núñez-Díaz M.   Mesa-Delgado A.   Esteban C.   López-Martín L.   García-Rojas J.   Luridiana V.  

Monthly Notices of the Royal Astronomical Society, Vol. 421, Iss. 4, 2012-04 ,pp. : 3399-3408 (10)

Oxford University Press

Access to resources Recommend Favorite

Eliminating error in the chemical abundance scale for extragalactic H ii regions

By López-Sánchez Á. R.   Dopita M. A.   Kewley L. J.   Zahid H. J.   Nicholls D. C.   Scharwächter J.  

Monthly Notices of the Royal Astronomical Society, Vol. 426, Iss. 4, 2012-11 ,pp. : 2630-2651 (22)

Oxford University Press

Access to resources Recommend Favorite

Scaling relations of star-forming regions: from kpc-sized clumps to H ii regions

By Wisnioski Emily   Glazebrook Karl   Blake Chris   Poole Gregory B.   Green Andrew W.   Wyder Ted   Martin Chris  

Monthly Notices of the Royal Astronomical Society, Vol. 422, Iss. 4, 2012-06 ,pp. : 3339-3355 (17)

Oxford University Press

Access to resources Recommend Favorite

Oxygen and nitrogen abundances of H ii regions in six spiral galaxies

By Gusev A. S.   Pilyugin L. S.   Sakhibov F.   Dodonov S. N.   Ezhkova O. V.   Khramtsova M. S.  

Monthly Notices of the Royal Astronomical Society, Vol. 424, Iss. 3, 2012-08 ,pp. : 1930-1940 (11)

Oxford University Press

Access to resources Recommend Favorite