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HD 115520, a new δ Scuti star
While performing uvby-β photoelectric photometry of some RR Lyraestars in Bootes, acquired in 2005 at the Observatorio AstronómicoNacional, México, we also observed several standard stars,HD115520 among them. After the reduction this star showed indications ofvariability and a compilation of all the data of this star reinforcedthis conclusion. In view of this, a new observing run was carried out in2006 during which we were able to demonstrate its variability. Wepresent here the data we acquired as well as some conclusions on itsnature as a δ Scuti star.
| Estimation of spectral classifications for bright northern stars with interesting Stromgren indices
The purpose of this investigation is to provide spectroscopic observerswith finding lists of potentially interesting objects. From anunpublished UVBY catalogue of 7026 northern stars (mostly brighter than8.3m) 1094 objects with interesting combinations of UVBY indices havebeen selected. Most stars with post-HD classifications have beenexcluded, as well as late F dwarfs belonging to the intermediatepopulation II. For the 792 remaining stars estimated spectralclassifications are given. The techniques and experience from a previouspaper dealing with southern stars have been utilized here. Among thepredicted spectral classifications are 40 OB stars; 262 Ap, Am, or Fmstars; 16 supergiants of types A to G; 110 bright giants of types A to K(class II); 156 double stars or objects with composite spectra; 26 lateF dwarfs; 91 weak-lined dwarf and giant stars of types F to K, includingearly F-type population II field blue stragglers; and a few possiblefield horizontal branch stars, lambda Bootis-type stars, and late-typehalo giants.
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