Blue variable stars from the MACHO database. I. Photometry and spectroscopy of the Large Magellanic Cloud sample

S. C. Keller; M. S. Bessell; K. H. Cook; M. Geha; D. Syphers

doi:10.1086/342548

Blue variable stars from the MACHO database. I. Photometry and spectroscopy of the Large Magellanic Cloud sample

S. C. Keller^*, M. S. Bessell, K. H. Cook, M. Geha, D. Syphers

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

59 Citations (Scopus)

Abstract

We present the photometric properties of 1279 blue variable stars within the Large Megallanic Cloud. Photometry is derived from the MACHO database. The light curves of the sample exhibit a variety of quasi-periodic and aperiodic outburst behavior. A characteristic feature of the photometric variation is that the objects are reddest when at maximum outburst. A subset of 102 objects were examined spectroscopically. Within this subset, 91% exhibited Balmer emission in at least one epoch, in some cases with spectacular spectral variability. The variability observed in the sample is consistent with the establishment and maintenance of the Be phenomenon.

Original language	English
Pages (from-to)	2039-2044
Number of pages	6
Journal	Astronomical Journal
Volume	124
Issue number	4 1762
DOIs	https://doi.org/10.1086/342548
Publication status	Published - Oct 2002

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title = "Blue variable stars from the MACHO database. I. Photometry and spectroscopy of the Large Magellanic Cloud sample",

abstract = "We present the photometric properties of 1279 blue variable stars within the Large Megallanic Cloud. Photometry is derived from the MACHO database. The light curves of the sample exhibit a variety of quasi-periodic and aperiodic outburst behavior. A characteristic feature of the photometric variation is that the objects are reddest when at maximum outburst. A subset of 102 objects were examined spectroscopically. Within this subset, 91\% exhibited Balmer emission in at least one epoch, in some cases with spectacular spectral variability. The variability observed in the sample is consistent with the establishment and maintenance of the Be phenomenon.",

keywords = "Galaxies: individual (Large Magellanic Cloud), Stars: emission-line, Be, Stars: variables: other",

author = "Keller, \{S. C.\} and Bessell, \{M. S.\} and Cook, \{K. H.\} and M. Geha and D. Syphers",

year = "2002",

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doi = "10.1086/342548",

language = "English",

volume = "124",

pages = "2039--2044",

journal = "Astronomical Journal",

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T1 - Blue variable stars from the MACHO database. I. Photometry and spectroscopy of the Large Magellanic Cloud sample

AU - Keller, S. C.

AU - Bessell, M. S.

AU - Cook, K. H.

AU - Geha, M.

AU - Syphers, D.

PY - 2002/10

Y1 - 2002/10

N2 - We present the photometric properties of 1279 blue variable stars within the Large Megallanic Cloud. Photometry is derived from the MACHO database. The light curves of the sample exhibit a variety of quasi-periodic and aperiodic outburst behavior. A characteristic feature of the photometric variation is that the objects are reddest when at maximum outburst. A subset of 102 objects were examined spectroscopically. Within this subset, 91% exhibited Balmer emission in at least one epoch, in some cases with spectacular spectral variability. The variability observed in the sample is consistent with the establishment and maintenance of the Be phenomenon.

AB - We present the photometric properties of 1279 blue variable stars within the Large Megallanic Cloud. Photometry is derived from the MACHO database. The light curves of the sample exhibit a variety of quasi-periodic and aperiodic outburst behavior. A characteristic feature of the photometric variation is that the objects are reddest when at maximum outburst. A subset of 102 objects were examined spectroscopically. Within this subset, 91% exhibited Balmer emission in at least one epoch, in some cases with spectacular spectral variability. The variability observed in the sample is consistent with the establishment and maintenance of the Be phenomenon.

KW - Galaxies: individual (Large Magellanic Cloud)

KW - Stars: emission-line, Be

KW - Stars: variables: other

UR - https://www.scopus.com/pages/publications/0141643329

U2 - 10.1086/342548

DO - 10.1086/342548

M3 - Article

SN - 0004-6256

VL - 124

SP - 2039

EP - 2044

JO - Astronomical Journal

JF - Astronomical Journal

IS - 4 1762

ER -

Blue variable stars from the MACHO database. I. Photometry and spectroscopy of the Large Magellanic Cloud sample

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