منابع مشابه
The central star of the Planetary Nebula NGC 6537
The fact that Space Telescope WFPC2 images of the planetary nebula NGC 6537 fail to show the central star is used to derive a limit to its magnitude: it is fainter than a magnitude of 22.4 in the visible. This is used to derive a lower limit to the temperature of the star. The Zanstra temperature is at least 500 000 K. The Energy Balance temperature is found to be consistent with this value, as...
متن کاملWebo 1: a Young Barium Star Surrounded by a Ring-like Planetary Nebula
WeBo 1 (PN G135.6+01.0), a previously unrecognized planetary nebula with a remarkable thinring morphology, was discovered serendipitously on Digitized Sky Survey images. The central star is found to be a late-type giant with overabundances of carbon and s-process elements. The giant is chromospherically active and photometrically variable, with a probable period of 4.7 days; this suggests that ...
متن کاملPlanetary nebula or symbiotic Mira ? Near infrared colours mark the difference ?
Nebulae around symbiotic Miras look very much like genuine planetary nebulae, although they are formed in a slightly different way. We present near infrared photometry of known and suspected symbiotic nebulae obtained with the Deep Near Infrared Southern Sky Survey (DENIS). We demonstrate that the near infrared colours are an excellent tool to distinguish symbiotic from genuine planetary nebula...
متن کاملA Far - Ultraviolet Spectroscopic Analysis of the Central Star of the Planetary Nebula Longmore
We have performed a non-LTE spectroscopic analysis using far-UV and UV data of the central star of the planetary nebula K1-26 (Longmore 1) and found kK, cm s , and 0.3 T p 120 10 log g p 6.7 eff 0.7 . The temperature is significantly hotter than previous results based on optical line analyses, highlighting Y 0.10 the importance of analyzing the spectra of such hot objects at shorter wavelengths...
متن کاملA Circular Planetary Nebula around the OH/IR Star OH354.88-0.54 (V1018 Sco)
New deep, high-resolution Hα imagery from the UK Schmidt Telescope (UKST) Unit’s Hα survey of the Southern Galactic Plane reveals the presence of a faint, highly circular, planetary nebula surrounding a very long period variable star (now known as V1018 Sco), first discovered as a 1612-MHz OH maser, OH354.88-0.54. The nebular phase-lag distance, diameter, and radial velocity are 3.2 kpc, 0.3 pc...
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ژورنال
عنوان ژورنال: International Astronomical Union Colloquium
سال: 1987
ISSN: 0252-9211
DOI: 10.1017/s025292110010569x