arXiv subjects

Grazyna Stasińska

Publications and source records attributed to Grazyna Stasińska.

3 recordsLinked to original sources

arXiv2023

Numerical models of planetary nebulae with different episodes of mass ejection: the particular case of HuBi 1

We have studied the evolution of HuBi 1-like planetary nebulae, considering several stages of mass injection. We have carried out numerical ionization+1D hydrodynamics+atomic/ionic rate models with our code Coral 1D to reproduce planetary nebulae that present multiple shells produced by different ejection events around the ionizing source. Furthermore, we are interested in comparing numerical simulations with H$α$ and [NII]$λ$6584 emission structures and the position-velocity diagrams observed in HuBi 1. This object also has a phase where it has drastically decreased the injection of ionized photons ejected from the source. The result of these different stages of ejection is a nebula with intense [NII] line emission in the inner part of the planetary nebula and an extended HII recombination line emission around the central zone. The model for HuBi 1 shows the capability of our code to explain the hydrodynamical and photoionization evolution in ionization nebulae. This is our first step with a 1D code to study these two physical phenomena at the same time.

astro-ph.GA↗

arXiv2020

A study of extragalactic planetary nebulae populations based on spectroscopy. I. Data compilation and first findings

We compile published spectroscopic data and [O III] magnitudes of almost 500 extragalactic planetary nebulae (PNe) in 13 galaxies of various masses and morphological types. This is the first paper of a series that aims to analyze the PN populations and their progenitors in these galaxies. Although the samples are not complete or homogeneous we obtain some first findings through the comparison of a few intensity line ratios and nebular parameters. We find that the ionized masses and the luminosities in H$β$, L$_{Hβ}$, of around 30 objects previously identified as PNe indicate that they are most likely compact HII regions. We find an anticorrelation between the electron densities and the ionized masses in M31, M33, and NGC 300 which suggests that most of the PNe observed in these galaxies are probably ionization bounded. This trend is absent in LMC and SMC suggesting that many of their PNe are density bounded. The He II/H$β$ values found in many PNe in LMC and some in M33 and SMC are higher than in the other galaxies. Photoionization models predict that these high values can only be reached in density bounded PNe. We also find that the brightest PNe in the sample are not necessarily the youngest since there is no correlation between electron densities and the H$β$ luminosities. The strong correlation found between L$_{Hβ}$-L$_{[O III]}$ implies that the so far not understood cut off of the planetary luminosity function (PNLF) based on [O III] magnitudes can be investigated using L$_{Hβ}$, a parameter much easier to study.

astro-ph.GA↗

arXiv2007

Recycling Matter in the Universe. X-ray observations of SBS 1150+599A (PN G135.9+55.9)

We present X-ray observations of the close binary nucleus of the planetary nebula SBS 1150+599A obtained with the XMM-Newton satellite. Only one component of the binary can be observed in optical-UV. New X-ray observations show that the previously invisible component is a very hot compact star. This finding allows us to deduce rough values for the basic parameters of the binary. With a high probability the total mass of the system exceeds Chandrasekhar limit and makes the SBS 1150+599A one of the best candidate for a supernova type Ia progenitor.

astro-ph↗