A CCD Search for Variable Stars of Spectral Type B in the Northern Hemisphere Open Clusters. VII. NGC 1502

• Autorzy: Michalska G. , Pigulski A. , Stęślicki M. , Narwid A.
• Języki publikacji: EN

Abstrakty

EN

We present results of variability search in the field of the young open cluster NGC 1502. Eight variable stars were discovered. Of six other stars in the observed field that were suspected for variability, we confirm variability of two, including one β Cep star, NGC 1502-26. The remaining four suspects were found to be constant in our photometry. In addition, UBVI_C photometry of the well-known massive eclipsing binary SZ Cam was obtained. The new variable stars include: two eclipsing binaries of which one is a relatively bright detached system with an EA-type light curve, an α² CVn-type variable, an SPB candidate, a field RR Lyr star and three other variables showing variability of unknown origin. The variability of two of them is probably related to their emission in Hα, which has been measured by means of the α index obtained for 57 stars brighter than V≈16 mag in the central part of the observed field. Four other non-variable stars with emission in Hα were also found. Additionally, we provide VI_C photometry for stars down to V=17 mag and UB photometry for about 50 brightest stars in the observed field. We also show that the 10 Myr isochrone fits very well the observed color-magnitude diagram if a distance of 1 kpc and mean reddening, E(V-I_C)=0.9 mag are adopted.

Słowa kluczowe

EN

Stars: early-type; Stars: emission-line; Be; open clusters: individual: NGC 1502; associations: individual: NGC 1502

• Wydawca: Copernicus Foundation for Polish Astronomy
• Czasopismo: Acta Astronomica
• Rocznik: 2009
• Tom: Vol. 59, No. 4
• Strony: 349--370
• Opis fizyczny: Biblogr. 77 poz., rys., tab., wykr.

Twórcy

autor

Michalska G.

• Universidad de Concepción, Departamento de Astronomia, Casilla 160-C, Concepción, Chile

autor

Pigulski A.

• Astronomical Institute, University of Wrocław, ul. Kopernika 11, 51-622 Wrocław, Poland

autor

Stęślicki M.

• Astronomical Institute, University of Wrocław, ul. Kopernika 11, 51-622 Wrocław, Poland

autor

Narwid A.

• Astronomical Institute, University of Wrocław, ul. Kopernika 11, 51-622 Wrocław, Poland

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