Chemical Abundances of Eight Highly Extincted Milky Way Planetary Nebulae

Abstract

Low- and intermediate-mass ($0.8{\mathrm{M}}_{\odot }<\mathrm{M}<8{\mathrm{M}}_{\odot }$) stars that evolve into planetary nebulae (PNe) play an important role in tracing and driving Galactic chemical evolution. Spectroscopy of PNe enables access to both the initial composition of their progenitor stars and products of their internal nucleosynthesis, but determining accurate ionic and elemental abundances of PNe requires high-quality optical spectra. We obtained new optical spectra of eight highly-extincted PNe with limited optical data in the literature using the Low Resolution Spectrograph 2 (LRS2) on the Hobby-Eberly Telescope (HET). Extinction coefficients, electron temperatures and densities, and ionic and elemental abundances of up to 11 elements (He, N, O, Ne, S, Cl, Ar, K, Fe, Kr, and Xe) are determined for each object in our sample. Where available, astrometric data from Gaia eDR3 is used to kinematically characterize the probability that each object belongs to the Milky Way's thin disk, thick disk, or halo. Four of the PNe show kinematic and chemical signs of thin disk membership, while two may be members of the thick disk. The remaining two targets lack Gaia data, but their solar O, Ar, and Cl abundances suggest thin disk membership. Additionally, we report the detection of broad emission features from the central star of M 3-35. Our results significantly improve the available information on the nebular parameters and chemical compositions of these objects, which can inform future analyses.

arXiv comment22 pages, 3 figures, 8 tables. Accepted for publication in AJ

References in corpus (39)

• Astropy: A Community Python Package for Astronomy
• Correcting for the Effects of Interstellar Extinction
• Estimating distances from parallaxes. V: Geometric and photogeometric distances to 1.47 billion stars in Gaia Early Data Release 3
• Local Kinematics and the Local Standard of Rest
• Trigonometric Parallaxes of High Mass Star Forming Regions: the Structure and Kinematics of the Milky Way
• The s Process: Nuclear Physics, Stellar Models, Observations
• The chemical make-up of the Sun: A 2020 vision
• The Dawes Review 2: Nucleosynthesis and stellar yields of low and intermediate-mass single stars
• PyNeb: a new tool for analyzing emission lines. I. Code description and validation of results
• Stellar yields from metal-rich asymptotic giant branch models
• Cool bottom processes on the thermally-pulsing AGB and the isotopic composition of circumstellar dust grains
• Ten Year Review of Queue Scheduling of the Hobby-Eberly Telescope
• Ionization Correction Factors for Planetary Nebulae: I- Using optical spectra
• The HETDEX Instrumentation: Hobby-Eberly Telescope Wide Field Upgrade and VIRUS
• Sulfur, Chlorine, and Argon Abundances in Planetary Nebulae. IV: Synthesis and the Sulfur Anomaly
• Nebular spectroscopy: A guide on H II regions and planetary nebulae
• Electron impact excitation of OII fine-structure levels
• HASH: the Hong Kong/AAO/Strasbourg H-alpha planetary nebula database
• Collision Strengths for [O III] Optical and Infrared Lines
• Improved He I Emissivities in the Case B Approximation
• s-Process Abundances in Planetary Nebulae
• The [Fe IV] Discrepancy: Constraining the Iron Abundances in Nebulae
• Oxygen enrichment in carbon-rich planetary nebulae
• ALFA: an automated line fitting algorithm
• Very deep spectroscopy of the bright Saturn Nebula NGC 7009 -- I. Observations and plasma diagnostics
• Chemical compositions and plasma parameters of planetary nebulae with Wolf-Rayet and wels type central stars
• The Curious Conundrum Regarding Sulfur Abundances In Planetary Nebulae
• S-process enrichment in the planetary nebula NGC 3918. Results from deep echelle spectrophotometry
• Gaia EDR3 in 6D: Searching for unbound stars in the Galaxy
• Discovery of Rubidium, Cadmium, and Germanium Emission Lines in the Near-Infrared Spectra of Planetary Nebulae
• The Abundances of Light Neutron-Capture Elements in Planetary Nebulae III. The Impact of New Atomic Data on Nebular Selenium and Krypton Abundance Determinations
• Discovery of Enhanced Germanium Abundances in Planetary Nebulae with FUSE
• Is the Sulphur Anomaly in Planetary Nebulae Caused by the s-Process?
• M4-18: The planetary nebula and its WC10 central star
• Know thy star, know thy planet: Chemo-kinematically characterizing TESS targets
• The Fe/Ni ratio in ionized nebulae: clues on dust depletion patterns
• Neutron-Capture elements in planetary nebulae: first detections of near-Infrared [Te III] and [Br V] emission lines
• Physical properties of the fluorine and neutron-capture element-rich PN Jonckheere 900
• Ionization correction factors for sodium, potassium, and calcium in planetary nebulae