Abell 43: longest period planetary nebula nucleus variable
نویسندگان
چکیده
منابع مشابه
The separation of the stars in the binary nucleus of the planetary nebula Abell 35
Using the Planetary Camera on board the Hubble Space Telescope we have measured the projected separation of the binary components in the nucleus of the planetary nebula Abell 35 to be larger than 0.08 but less than 0.14. The system was imaged in three filters centered at 2950Å, 3350Å and 5785Å. The white dwarf primary star responsible for ionizing the nebula is half as bright as its companion i...
متن کاملPhysical conditions in the planetary nebula Abell 30
We have analysed optical spectra of two of the hydrogen-deficient knots (J1 & J3) in the born-again planetary nebula Abell 30, together with UV spectra of knots J3 & J4. We determine electron temperatures in the knots based on several diagnostics. The [O III] nebular-toauroral transition ratio yields temperatures of the order of 17 000 K. The weak temperature dependence of the ratios of helium ...
متن کاملRummaging inside the Eskimo’s parka: variable asymmetric planetary nebula fast wind and a binary nucleus?
We report on high-resolution optical time series spectroscopy of the central star of the ‘Eskimo’ planetary nebula NGC 2392. Data sets were secured with the European Southern Observatory (ESO) 2.3 m in 2006 March and Canada–France–Hawaii Telescope (CFHT) 3.6 m in 2010 March to diagnose the fast wind and photospheric properties of the central star. The He I and He II recombination lines reveal e...
متن کاملThree - dimensional photoionization modelling of the hydrogen - deficient knots in the planetary nebula Abell 30
We have constructed a photoionization model, using the 3-D Monte Carlo code MOCASSIN for one of the hydrogen-deficient knots (J3) of the born-again planetary nebula Abell 30. The model consists of spherical knots, comprising a cold, dense, hydrogen-deficient core with very high metal abundances. The inner core, occupying 9.1% of the total volume of the knot, is surrounded by a less dense hydrog...
متن کاملA barium central star binary in the Type - I diamond ring planetary nebula Abell 70 ⋆
Abell 70 (PN G038.1−25.4, hereafter A 70) is a planetary nebula (PN) known for its diamond ring appearance due a superposition with a background galaxy. The previously unstudied central star is found to be a binary consisting of a G8IV-V secondary at optical wavelengths and a hot white dwarf (WD) at UV wavelengths. The secondary shows Ba II and Sr II features enhanced for its spectral type that...
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ژورنال
عنوان ژورنال: Astronomy & Astrophysics
سال: 2007
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361:20077364