Spectroscopic Study of M33 with the LAMOST Survey. I. Chemical Gradients from Nebulae

Author:

Alexeeva SofyaORCID,Zhao GangORCID

Abstract

AbstractMorphological and chemical structures of M33 are investigated with the LAMOST DR7 survey. Physical parameters; extinction; chemical composition of He, N, O, Ne, S, Cl, and Ar (where available); and radial velocities were determined for 110 nebulae (95 Hiiregions and 15 planetary nebulae) in M33. Among them, 8 planetary nebulae and 55 Hiiregions in M33 are newly discovered. We obtained the following O abundance gradients: −0.1990.030+0.030dexR251(based on 95 Hiiregions), −0.1240.036+0.036dexR251(based on 93 Hiiregions), and −0.2070.174+0.160dexR251(based on 21 Hiiregions), utilizing abundances from N2 at O3N2 diagnostics and theTe-sensitive method, respectively. The He, N, Ne, S, and Ar gradients resulted in slopes of −0.1790.146+0.145, −0.4310.281+0.282, −0.1710.239+0.234, −0.4170.182+0.174, and −0.3400.157+0.156, respectively, utilizing abundances from theTe-sensitive method. Our results confirm the existence of the negative axisymmetric global metallicity distribution that is assumed in the literature. We noticed one new WC star candidate and one transition W-R WN/C candidate. The grand-design pattern of the spiral structure of M33 is presented.

Funder

National Natural Science Foundation of China

MOST ∣ National Key Research and Development Program of China

Publisher

American Astronomical Society

Subject

Space and Planetary Science,Astronomy and Astrophysics

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