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@article{1468438, author = {Bernhard, Klaus and Otero, Sebastian and Hummerich, Stefan and Kaltcheva, Nadia and Paunzen, Ernst and Bohlsen, Terry}, article_location = {MALDEN}, article_number = {3}, doi = {http://dx.doi.org/10.1093/mnras/sty1320}, keywords = {stars: circumstellar matter; Stars: early-type; stars: emission-line Be; stars: oscillations; stars: variables: general}, language = {eng}, issn = {0035-8711}, journal = {Monthly Notices of the Royal Astronomical Society}, title = {An investigation of the photometric variability of confirmed and candidate Galactic Be stars using ASAS-3 data}, url = {http://dx.doi.org/10.1093/mnras/sty1320}, volume = {479}, year = {2018} }
TY - JOUR ID - 1468438 AU - Bernhard, Klaus - Otero, Sebastian - Hummerich, Stefan - Kaltcheva, Nadia - Paunzen, Ernst - Bohlsen, Terry PY - 2018 TI - An investigation of the photometric variability of confirmed and candidate Galactic Be stars using ASAS-3 data JF - Monthly Notices of the Royal Astronomical Society VL - 479 IS - 3 SP - 2909-2967 EP - 2909-2967 PB - WILEY SN - 00358711 KW - stars: circumstellar matter KW - Stars: early-type KW - stars: emission-line Be KW - stars: oscillations KW - stars: variables: general UR - http://dx.doi.org/10.1093/mnras/sty1320 N2 - We present an investigation of a large sample of confirmed (N = 233) and candidate (N = 54) Galactic classical Be stars (mean V magnitude range of 6.4-12.6 mag), with the main aim of characterizing their photometric variability. Our sample stars were preselected among early-type variables using light-curve morphology criteria. Spectroscopic information was gleaned from the literature, and archival and newly acquired spectra. Photometric variability was analysed using archival ASAS-3 time-series data. To enable a comparison of results, we have largely adopted the methodology of Labadie-Bartz et al. (2017), who carried out a similar investigation based on KELT data. Complex photometric variations were established in most stars: outbursts on different time-scales (in 73 +/- 5 per cent of stars), long-term variations (36 +/- 6 per cent), periodic variations on intermediate time-scales (1 +/- 1 per cent), and short-term periodic variations (6 +/- 3 per cent). 24 +/- 6 per cent of the outbursting stars exhibit (semi) periodic outbursts. We close the apparent void of rare outbursters reported by Labadie-Bartz et al. (2017) and show that Be stars with infrequent outbursts are not rare. While we do not find a significant difference in the percentage of stars showing outbursts among early-type, mid-type, and late-type Be stars, we show that early-type Be stars exhibit much more frequent outbursts. We have measured rising and falling times for well-covered and well-defined outbursts. Nearly all outburst events are characterized by falling times that exceed the rising times. No differences were found between early-, mid-, and late-type stars; a single non-linear function adequately describes the ratio of falling time to rising time across all spectral subtypes, with the ratio being larger for short events. ER -
BERNHARD, Klaus, Sebastian OTERO, Stefan HUMMERICH, Nadia KALTCHEVA, Ernst PAUNZEN a Terry BOHLSEN. An investigation of the photometric variability of confirmed and candidate Galactic Be stars using ASAS-3 data. \textit{Monthly Notices of the Royal Astronomical Society}. MALDEN: WILEY, 2018, roč.~479, č.~3, s.~2909-2967. ISSN~0035-8711. Dostupné z: https://dx.doi.org/10.1093/mnras/sty1320.
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