New β Cephei variable in the Southern open cluster NGC 6200: ALS 3728

Abstract

We report the evidence of a new $\beta$ Cephei type variable located in the Southern open cluster \astrobj{NGC 6200}: \astrobj{ALS 3728}. Spectroscopic and photometric observations of NGC\,6200 stars were carried out at the South African Astronomical Observatory (SAAO) in 2011. It was found that \astrobj{ALS 3728} has a frequency of about 4.95 d${}^{-1}$ with highest amplitude. The star also shows a remarkable stillstand phase just before its light maxima which is a typical characteristic occurring among these type of stars. Furthermore, a mode identification is applied for the dominant frequency that is calculated from the Fourier analysis.

15 pages, 4 figures, 1 table. This paper has been accepted for publication in New Astronomy

References in corpus (4)

• Kepler observations of variability in B-type stars
• Abundance analysis of prime B-type targets for asteroseismology I. Nitrogen excess in slowly-rotating beta Cephei stars
• New studies of a variety of Southern pulsating B stars
• An asteroseismic study of the Southern $\beta$ Cephei star \astrobj{ALS 3721}