The variable stars of NGC 1866

Journal Article · Fri Feb 01 04:00:00 EST 1991 · Astronomical Journal; (USA)

DOI:https://doi.org/10.1086/115700· OSTI ID:5914227

Welch, D L; Cote, P; Fischer, P; Mateo, M; Madore, B F ^[1]

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1. McMaster Univ., Hamilton (Canada) Observatories of the Carnegie Institution, Pasadena, CA (USA) JPL, Pasadena, CA (USA)

A search has been conducted for new variables in the LMC cluster NGC 1866 using new multiepoch CCD photometry. Eight previously unknown Cepheid variables, most near the cluster core, are found. Of the new variables reported by Storm et al. (188), only six of 10 appear to be Cepheids and one of these is not a member. Periods and mean magnitudes and colors for sufficiently uncrowded variables are reported, as is one red giant variable of long period and one Cepheid which is a single-lined spectroscopic binary with a velocity semiamplitude greater than or equal to 10.5 km/s. The variation of light-curve amplitude with position in the instability strip is reported along with an apparently nonvariable star, which is a radial velocity member, in the strip. A true distance modulus of 18.57 + or - 0.01 mag is obtained for the cluster. 36 refs.

• OSTI ID: 5914227
• Journal Information: Astronomical Journal; (USA), Journal Name: Astronomical Journal; (USA) Vol. 101; ISSN 0004-6256; ISSN ANJOA
• Country of Publication: United States
• Language: English

Related Subjects

640102* -- Astrophysics & Cosmology-- Stars & Quasi-Stellar
Radio & X-Ray Sources
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
BRIGHTNESS
CEPHEIDS
CHARGE-COUPLED DEVICES
COLOR
DISTANCE
GALAXIES
GIANT STARS
MAGELLANIC CLOUDS
OPTICAL PROPERTIES
ORGANOLEPTIC PROPERTIES
PHOTOMETRY
PHYSICAL PROPERTIES
PULSATING VARIABLE STARS
RADIAL VELOCITY
RED GIANT STARS
SEMICONDUCTOR DEVICES
SPECTROPHOTOMETRY
STAR CLUSTERS
STARS
VARIABLE STARS
VELOCITY