The MACHO Project LMC variable star inventory: Aperiodic blue variables

Technical Report · Wed Dec 13 04:00:00 EST 1995

DOI:https://doi.org/10.2172/195743· OSTI ID:195743

Purdue, P ^[1]

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1. Bryn Mawr Coll., PA (United States)

The MACHO Project database was searched for aperiodic blue variables in the LMC. Of approximately 250,000 bright blue stars in the region of observation, around 3,500 had been flagged as variables or as rejected gravitational microlensing candidates from a visual inspection of this set, about 400 stars were selected for the catalog. These stars have been categorized by their light curve morphology. Their spatial distribution is presented and correlated with known phenomena. Analysis of the catalog stars has produced some interesting discoveries. Among some of these variables, unusual color changes were found. Some stars become redder or do not change color when their brightness increases, whereas most stars become bluer if they rapidly brighten. For some stars with relatively long quiescent stages, the light curves were searched for low-level, periodic variability, but no conclusive evidence for such behavior was found.

• Research Organization: Lawrence Livermore National Lab., CA (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 195743
• Report Number(s): UCRL-ID--122897; ON: DE96006101
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
CLASSIFICATION
COLOR
GRAVITATIONAL LENSES
MAGELLANIC CLOUDS
SPATIAL DISTRIBUTION
VARIABLE STARS