Spectroscopic investigation of old planetaries. I - Detection of two new "PG 1159" central stars

Details Spectroscopic investigation of old planetaries. I - Detection of two new "PG 1159" central stars Spectroscopic investigation of old planetaries. I - Detection of two new "PG 1159" central stars

May 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...231l..33s&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 231, no. 2, May 1990, p. L33-l35.

Astronomy and Astrophysics

Astrophysics

16

Absorption Spectra, Astronomical Spectroscopy, Faint Objects, Planetary Nebulae, White Dwarf Stars, Stellar Atmospheres, Stellar Evolution, Stellar Luminosity

Scientific paper

By means of a spectroscopic survey of faint planetary nebulae it was found that the nuclei of IW 1 and Jn 1 belong to the class of the so-called "PG 1159" objects. The spectra show strong absorption features of He II and CIV, with no or only weak photospheric emissions, and resemble that of VV 47. Both the new PG 1159 central stars are an equivalent to the faintest hydrogen-rich nuclei, and this fact proves the existence of an evolutionary sequence from high to low luminosity also for hydrogen-free central stars.

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