Abstract. The "Catalogue of Stars in the Northern Milky Way Having H-alpha in Emission" appears in Abhandlungen aus der Hamburger Sternwarte, Band XI in the year 1997. It contains 4174 stars, range 32• having the Hα line in emission. HBH stars and stars of further 99 lists taken from the literature till the end of 1994 were included in the catalogue. We give the cross-identification of stars from all lists used. The catalogue is also available in the Centre de Données, Strasbourg 1 and at the Hamburg Observatory via internet.

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Abstract. UBV photometry of the central star of the Trifid nebula -HD 164492, which has so far been suspected of photometric as well as of radial velocity variability -is presented. The results of our photometry do not confirm any variability. Moreover, based on new high resolution CCD spectra any radial velocity variability can be discarded. Photometry of several other members of the multiple stellar system is included; according to this photometry, the system is a physical one. Equivalent widths for the main component of HD 164492 are given. Positions measured on CCD exposures are presented too.

Accurate optical coordinates of 734 PNe, measured on the charts of the Digitized Palomar Sky Survey, are presented. As a result of the discussion about the external accuracy the constants –0.8″ in RA and +0.8″ in DEC should be added to the coordinates measured by us. They were used but rounded off already in CGPN(2000). The list and measurements of new 31 candidates of central stars are given which might be interesting for stellar evolution.

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Abstract. This paper is dealing with the investigation of H-alpha emission stars towards the galactic bulge. In this important region 533 H-alpha emission stars have already been discovered. We add 98 new and 9 possible new (perhaps identical with known objects) H-alpha emission stars found in the objective-prism survey of planetary nebulae and we give the identification charts, the accurate coordinates as well as a rough description. The distribution in l, b of all objects shows the expected concentration towards the galactic equator with the maximum near l=0• and b=0• distorted probably due to strong interstellar extinction.

In the first part of this study of PN towards the galactic centre we present the discovery of 24 new planetary nebulae found on the objective-prism spectra in three ESO fields (Table 1 -parameters of the survey, Tables 3 and 4new objects). The observations of those objects are listed in Table 5. Besides, we give the classification and the positions of known objects in this area ( Table 2).

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