Spectra of three planetary nebulae and a search for nebular emissions around 12 sdO stars

Details Spectra of three planetary nebulae and a search for nebular emissions around 12 sdO stars Spectra of three planetary nebulae and a search for nebular emissions around 12 sdO stars

Jun 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...198..287m&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 198, no. 1-2, June 1988, p. 287-292. Research supported by the Max-Planck-Inst

Astronomy and Astrophysics

Astrophysics

15

Astronomical Spectroscopy, O Stars, Planetary Nebulae, Spectrograms, Subdwarf Stars, Spectral Emission, Stellar Evolution, Stellar Temperature

Scientific paper

The authors have made a deep search for faint emission nebulae around 12 hot sdO stars, by means of long slit spectroscopy. For comparison, they have observed with the same equipment the planetary nebulae recently discovered around RWT 152, LSS 2018, and LSS 1362. They have detected faint emission around 6 of their 12 program objects. However, it is argued that these emissions are not associated with the sdO stars. Instead, reasons are found to suggest to have detected unrelated diffuse low-excitation ionized regions, such as those studied by Reynolds (1984). It is concluded that searches around other sdO stars at this level of sensitivity should be preferentially based on (or at least complemented by) direct imaging, particularly at low galactic latitudes. Finally, the authors make some comments about the interpretation of low-gravity sdO stars not surrounded by detectable nebulosity as post-AGB objects.

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