Detection of the very hot central star in NGC2440

Details Detection of the very hot central star in NGC2440 Detection of the very hot central star in NGC2440

Apr 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986natur.320..423a&link_type=abstract

Nature (ISSN 0028-0836), vol. 320, April 3, 1986, p. 423-425.

Astronomy and Astrophysics

Astronomy

16

Hot Stars, Planetary Nebulae, Astronomical Maps, Charge Coupled Devices, Stellar Luminosity, Stellar Temperature, White Dwarf Stars

Scientific paper

The authors report the detection of the central star of the planetary nebula NGC 2440 in a narrow-band continuum image using a CCD camera at the prime focus of the Anglo-Australian telescope. Its visual magnitude has been measured as 18.9±0.2. Its Zanstra temperature is about 350,000K, so that it is one of the hottest stars ever observed. Its radius corresponds to that of a nearly degenerate star. Theoretical calculations can explain the observed temperature and luminosity if it has a mass of at least 1.0 M_sun; and is in its cooling stage, but the predicted age of the nebula is considerably less than that required by the calculations. Futhermore, the present estimates of the progenitor mass of a 1 M_sun; white dwarf are brought into question.

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