Optical BVRI photometry of common proper motion F/G/K+M wide separation binaries

Journal Article · Wed Oct 01 04:00:00 EDT 2014 · Astronomical Journal (New York, N.Y. Online)

DOI:https://doi.org/10.1088/0004-6256/148/4/60· OSTI ID:22342253

Li, Ting; Marshall, Jennifer L.; Williams, Patrick; Chavez, Joy ^[1]; Lépine, Sébastien ^[2]

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1. Department of Physics and Astronomy, Texas A and M University, College Station, TX 77840 (United States)
2. Department of Physics and Astronomy, Georgia State University, Atlanta, GA 30302-4106 (United States)

We present optical (BVRI) photometric measurements of a sample of 76 common proper motion wide separation main-sequence binary pairs. The pairs are composed of a F-, G-, or K-type primary star and an M-type secondary. The sample is selected from the revised NLTT catalog and the LSPM catalog. The photometry is generally precise to 0.03 mag in all bands. We separate our sample into two groups, dwarf candidates and subdwarf candidates, using the reduced proper motion diagram constructed with our improved photometry. The M subdwarf candidates in general have larger V – R colors than the M dwarf candidates at a given V – I color. This is consistent with an average metallicity difference between the two groups, as predicted by the PHOENIX/BT-Settl models. The improved photometry will be used as input into a technique to determine the metallicities of the M-type stars.

• OSTI ID: 22342253
• Journal Information: Astronomical Journal (New York, N.Y. Online), Journal Name: Astronomical Journal (New York, N.Y. Online) Journal Issue: 4 Vol. 148; ISSN 1538-3881
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
BINARY STARS
CATALOGS
COLOR
DWARF STARS
GALAXIES
METALLICITY
PHOTOMETRY
PROPER MOTION
STARS