GTC Spectroscopic Surveys of Planetary Nebulae in the Milky Way and M31
arxiv(2024)
摘要
We report spectroscopic surveys of planetary nebulae (PNe) in the Milky Way
and Andromeda (M31), using the 10.4-m Gran Telescopio Canarias (GTC). The
spectra are of high quality and cover the whole optical range, mostly from 3650
Å to beyond 1 micron, enabling detection of nebular emission lines critical
for spectral analysis as well as photoionization modeling. We obtained GTC
spectra of 24 compact (angular diameter <5 arcsec) PNe located in the Galactic
disk, 3-20 kpc from the Galactic centre, and can be used to constrain stellar
evolution models and derive radial abundance gradients of the Milky Way. We
have observed 30 PNe in the outer halo of M31 using the GTC. These halo PNe are
uniformly metal-rich and probably all evolved from low-mass stars, consistent
with the conjecture that they all formed from the metal-rich gas in M31 disk
but displaced to their present locations due to galaxy interactions.
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