- Conference date: 27–30 October 2010
- Location: Damai Laut, (Malaysia)
The Pleiades is an open star cluster located in the constellation of Taurus, which mainly consists of hot and luminous B‐type stars. Observations were conducted over five‐day period in December 2009 at Langkawi National Observatory, Malaysia by using 20‐inch telescope diameter of Ritchey‐Chrétien reflector telescope, together with SBIG Self Guided Spectrograph and SBIG ST‐7 CCD camera. The spectra of seven main members of the cluster, namely Alcyone; Atlas; Celaeno; Electra; Maia; Merope and Taygeta; and of Alcyone B; a smaller component of Alcyone quadruple system, were obtained in the optical range of approximately 6300 Å to 7100 Å. This range was picked due to the vicinity of Balmer H‐α spectral line at 6562.852 Å. Alcyone, Electra and Merope were found to have H‐α emissions possibly caused by the presence of equatorial circumstellar disks or envelopes made up of ejected matter. Electra and Merope in particular exhibited peculiar asymmetric double emission peaks, which could be evidence of one‐armed density wave in each of their circumstellar disks. Atlas, Celaeno, Merope, Taygeta and Alcyone B showed strong H‐α absorptions with broadening characteristic of high rotational velocities. As deduced from the spectra, the stars were found to have atmospheres with similar chemical content, with spectral lines characteristics of singly ionized silicon, singly ionized iron and singly ionized oxygen. The measured radial velocities of all eight stars also suggest that the cluster could someday disperse.
- Stellar clusters
- Atmospheric properties
- Stellar spectral lines
- Astronomical spectroscopy
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