Journal
ASTRONOMICAL JOURNAL
Volume 146, Issue 4, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0004-6256/146/4/102
Keywords
open clusters and associations: individual (NGC 884); stars: early-type; stars: oscillations; techniques: photometric
Categories
Funding
- European Research Council under the European Community [227224]
- STFC [ST/J001163/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/J001163/1] Funding Source: researchfish
Ask authors/readers for more resources
Recent progress in the seismic interpretation of field beta Cep stars has resulted in improvements of the physical description in the stellar structure and evolution model computations of massive stars. Further asteroseismic constraints can be obtained from studying ensembles of stars in a young open cluster, which all have similar age, distance, and chemical composition. We present an observational asteroseismology study based on the discovery of numerous multi-periodic and mono-periodic B stars in the open cluster NGC 884. We describe a thorough investigation of the pulsational properties of all B-type stars in the cluster. Overall, our detailed frequency analysis resulted in 115 detected frequencies in 65 stars. We found 36 mono-periodic, 16 bi-periodic, 10 tri-periodic, and 2 quadru-periodic stars and one star with nine independent frequencies. We also derived the amplitudes and phases of all detected frequencies in the U, B, V, and I filter, if available. We achieved unambiguous identifications of the mode degree for 12 of the detected frequencies in nine of the pulsators. Imposing the identified degrees and measured frequencies of the radial, dipole, and quadrupole modes of five pulsators led to a seismic cluster age estimate of log(age/yr) = 7.12-7.28 from a comparison with stellar models. Our study is a proof-of-concept for and illustrates the current status of ensemble asteroseismology of a young open cluster.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available