Variability Survey in the Open Cluster Stock 14 and the Surrounding Fields

• Autorzy: Drobek D. , Pigulski A. , Shobbrook R. R. , Narwid A.
• Języki publikacji: EN

Abstrakty

EN

We present the results of a photometric variability survey in the young open cluster Stock 14 and the surrounding fields. In total, we detected 103 variable stars of which 88 are new discoveries. We confirm short-period, low-amplitude light variations in two eclipsing members of the cluster, HD 101838 and HD 101794. In addition, we find two new β Cep stars of which one, HD 101993, is also a member. The sample of pulsating cluster members is supplemented by one multimode slowly pulsating B-type star and several single-mode candidates of this type. The other pulsating stars in our sample are mostly field stars. In particular, we found fourteen δ Sct stars including one γ Dor/δ Sct hybrid pulsator. From our UBV photometry we derived new parameters of Stock 14: the mean reddening E(B-V)=0.21±0.02 mag, the true distance modulus, 11.90±0.05 mag, and the age, 20±10 Myr. Finally, we use the new photometry to analyze changes of the 6.322-d orbital period of the bright eclipsing binary and the member of the cluster, V346 Cen. In addition to the known apsidal motion, we find that another effect, possibly light-time effect in a hierarchical system of a very long orbital period, affects these changes. The updated value of the period of apsidal motion for this system amounts to 306±4 yr. The open cluster Stock 14 was found to be a fairly good candidate for successful ensemble asteroseismology.

Słowa kluczowe

EN

stars: early-type; stars: oscillations: including pulsations; stars: individual: HD 101838; stars: individual: HD 101794; stars: individual: HD 101993; stars: individual: V346; cen; open clusters: individual: Stock 14; open and associations: individual: Stock 14

• Wydawca: Copernicus Foundation for Polish Astronomy
• Czasopismo: Acta Astronomica
• Rocznik: 2013
• Tom: Vol. 63, No. 3
• Strony: 339--368
• Opis fizyczny: Bibliogr. 62 poz., rys., tab., wykr.

Twórcy

autor

Drobek D.

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

autor

Pigulski A.

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

autor

Shobbrook R. R.

• Research School of Astronomy and Astrophysics, Australian National University, Canberra, ACT, Australia

autor

Narwid A.

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

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