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HD 59864 - A new Beta Cephei-type variable star
Photoelectric observations of HD 59864 are reported. The star is foundto be a Beta Cephei-type variable. Frequency analysis of the dataindicates that the light variation consists of two short-periodcomponents. However, frequencies of the components cannot beunambiguously derived from the present data. Four pairs of frequenciesthat equally well represent the data are given.
| Distribution of B5 to A5 stars at (l, b) = (253 deg, -7 deg)
A study to V of about 12 mag is conducted for the distribution ofinterstellar extinction and early type stars (up to A5) in the (l, b) =(253 deg, -7 deg) field. The space density of B5, B8-A0, and A2-A5 starsis found to be normal for a field outside the galactic plane, and thestellar and extinction data indicate that the direction in question liesout of the matter plane of the Milky Way at least to 3 kpc. The higherextinction of Bochun 15 and the absence of background galaxies, however,suggest the possible presence of the galactic warp at -7 deg, atdistances beyond about 5 kpc, as well as a total higher extinction thanthe maximum of E(B-V) = 0.53 for d greater than 10 kpc, as found at (l,b) = (245 deg, zero deg).
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Osservazione e dati astrometrici
| Costellazione: | Poppa |
| Ascensione retta: | 07h28m56.68s |
| Declinazione: | -34°55'06.2" |
| Magnitudine apparente: | 6.903 |
| Distanza: | 306.748 parsec |
| Moto proprio RA: | -8.7 |
| Moto proprio Dec: | 4.8 |
| B-T magnitude: | 6.763 |
| V-T magnitude: | 6.892 |
Cataloghi e designazioni:
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