A survey of bipolar and cometary nebulae. Photographic and photometric observations

The present search for unknown bipolar nebulae covers nearly the total Milky Way north of delta = -30 deg. The 20 probably bipolar nebulae found are presented together with UBVRI and IR photometry. Most of the central stars identified in these nebulae are of early spectral type, with a visual extinc...

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Veröffentlicht in:	Astronomy and astrophysics (Berlin) 1984-02, Vol.131 (2), p.200-209
Hauptverfasser:	NECKEL, T, STAUDE, H. J
Format:	Artikel
Sprache:	eng
Schlagworte:	Astronomy Earth, ocean, space Exact sciences and technology Interstellar medium (ism) and nebulae in milky way Planetary nebulae Stellar systems. Galactic and extragalactic objects and systems. The universe
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Zusammenfassung:	The present search for unknown bipolar nebulae covers nearly the total Milky Way north of delta = -30 deg. The 20 probably bipolar nebulae found are presented together with UBVRI and IR photometry. Most of the central stars identified in these nebulae are of early spectral type, with a visual extinction that reaches values of up to 25 mag. The most obvious bipolar nebula, designated No. 14, consists of two luminous lobes that are separated by a dark lane at whose narrowest point a radio and IR source is found. A CCD image at 1.0 microns reveals a double star to be the exciting source near this position.
ISSN:	0004-6361 1432-0746