An investigation of the photometric variability of confirmed
and candidate Galactic Be stars using ASAS-3 data

J 2018

An investigation of the photometric variability of confirmed and candidate Galactic Be stars using ASAS-3 data

BERNHARD, Klaus; Sebastian OTERO; Stefan HUMMERICH; Nadia KALTCHEVA; Ernst PAUNZEN et al.

Základní údaje

Originální název

An investigation of the photometric variability of confirmed and candidate Galactic Be stars using ASAS-3 data

Autoři

BERNHARD, Klaus; Sebastian OTERO; Stefan HUMMERICH; Nadia KALTCHEVA; Ernst PAUNZEN a Terry BOHLSEN

Vydání

Monthly Notices of the Royal Astronomical Society, MALDEN, WILEY, 2018, 0035-8711

Další údaje

Jazyk

angličtina

Typ výsledku

Článek v odborném periodiku

Obor

10308 Astronomy

Stát vydavatele

Velká Británie a Severní Irsko

Utajení

není předmětem státního či obchodního tajemství

Odkazy

URL

Impakt faktor

Impact factor: 5.231

Označené pro přenos do RIV

Ano

Kód RIV

RIV/00216224:14310/18:00104476

Organizační jednotka

Přírodovědecká fakulta

Klíčová slova anglicky

stars: circumstellar matter; Stars: early-type; stars: emission-line Be; stars: oscillations; stars: variables: general

Příznaky

Mezinárodní význam, Recenzováno

Změněno: 23. 4. 2024 12:41, Mgr. Michal Petr

Anotace

V originále

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.

Návaznosti

7AMB17AT030, projekt VaV

Název: Analýza hvězd se skvrnami pomocí kvalitních pozorovacích dat

Investor: Ministerstvo školství, mládeže a tělovýchovy ČR, Analýza hvězd se skvrnami pomocí kvalitních pozorovacích dat

Citovat

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. Monthly Notices of the Royal Astronomical Society. MALDEN: WILEY, 2018, roč. 479, č. 3, s. 2909-2967. ISSN 0035-8711. Dostupné z: https://doi.org/10.1093/mnras/sty1320.

@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 = {https://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://doi.org/10.1093/mnras/sty1320.

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