A CCD Search for Variable Stars of Spectral Type B in the Northern Hemisphere Open Clusters. IV. NGC 663

Pigulski, A.; Kopacki, G.; Kołaczkowski, Z.

Artykuł - szczegóły

Tytuł artykułu

A CCD Search for Variable Stars of Spectral Type B in the Northern Hemisphere Open Clusters. IV. NGC 663

Autorzy

Pigulski A. , Kopacki G. , Kołaczkowski Z.

Wybrane pełne teksty z tego czasopisma

http://acta.astrouw.edu.pl/

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Warianty tytułu

Języki publikacji

Abstrakty

We present results of the variability search in the field of the young open cluster NGC 663. In addition to the one β Cep-type variable known in this cluster, we found another one. It is a mono-periodic pulsator changing brightness with a period of 0.27640 d. In total, 19 new variables were discovered and the variability of 5 other ones was confirmed. Out of all 24 variables in the observed field, 21 are probable cluster members. One SPB candidate and three eclipsing or ellipsoidal variables could be classified. Moreover, ten out of fourteen Be stars we observed vary in brightness. Only one of them shows periodic variations of the λ Eri-type, while the remaining ones exhibit irregular changes with the range up to 0.4 mag in the I_C band. We also provide new VI_C photometry of 477 stars in the field of the cluster and check the consistence of the present photometry with cluster parameters derived earlier. The average cluster E(V-I_C) color excess amounts to about 0.92 mag.

Słowa kluczowe

stars: early-type binaries: eclipsing open clusters and associations: individual: NGC 663

Wydawca

Copernicus Foundation for Polish Astronomy

Czasopismo

Acta Astronomica

Rocznik

2001

Tom

Vol. 51, No. 2

Strony

159--174

Opis fizyczny

Bibliogr. 55 poz., rys., tab., wykr.

Twórcy

autor

Pigulski A.

pigulski@astro.uni.wroc.pl

Wrocław University Observatory, Kopernika 11, 51-622 Wrocław, Poland

autor

Kopacki G.

kopacki@astro.uni.wroc.pl

Wrocław University Observatory, Kopernika 11, 51-622 Wrocław, Poland

autor

Kołaczkowski Z.

kulaczk@astro.uni.wroc.pl

Wrocław University Observatory, Kopernika 11, 51-622 Wrocław, Poland

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Bibliografia

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