Astrofísicas: Nebulosas planetarias

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    Ionization correction factors for sodium, potassium, and calcium in planetary nebulae
    We use a large grid of photoionization models that are representative of observed planetary nebulae (PNe) to derive ionization correction factors (ICFs) for...
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    IPHAS and the symbiotic stars. I. Selection method and first discoveries
    Context: The study of symbiotic stars is essential to understand important aspects of stellar evolution in interacting binaries. Their observed population in...
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    IPHAS and the symbiotic stars. III. New discoveries and their IR spectral energy distributions
    Context. The IPHAS Hα survey provides a rich database to search for emission-line sources in the northern Galactic plane. Aims: We are systematically searching...
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    IPHAS extinction distances to planetary nebulae
    Aims: The determination of reliable distances to planetary nebulae (PNe) is a major difficulty in the study of this class of objects in the Galaxy. The...
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    IPHASX J052531.2+281946: a new Planetary Nebula towards the Galactic Anticentre
    A planetary nebula has been discovered in the course of the INT/WFC Photometric Hα Survey (IPHAS) of the northern galactic plane. It is located near the...
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    IRAS 06562-0337 - Final mass-loss episodes before the formation of a planetary nebula?
    The onset of forbidden line emission in the spectrum of a proto-planetary nebula has been detected for the first time in the lapse of only two years. IRAS 06562...
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    IRAS 16455-3455 and IRAS 15154-5258 - Two new southern planetary nebulae
    The identification of two new southern planetary nebulae, IRAS 16455-3455 and IRAS 15154-5258, via low resolution spectroscopy, is reported. IRAS 16455-3455 is...
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    IRAS 17423-1755 (Hen 3-1475) Revisited: An O-rich High-mass Post-asymptotic Giant Branch Star
    The high-resolution (R ~ 600) Spitzer/IRS spectrum of the bipolar protoplanetary nebula (PN) IRAS 17423-1755 is presented in order to clarify the dominant...
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    IRAS 17423-1755: A BQ() star with a variable velocity outflow
    Infrared Astronomy Satellite (IRAS) 17423-1755 has been identified as a BQ() star. Its more remarkable observed features are large radial velocities, huge line...