Spectrophotometry of the new common-proper-motion pair ESO 440-55a/55b

Details Spectrophotometry of the new common-proper-motion pair ESO 440-55a/55b Spectrophotometry of the new common-proper-motion pair ESO 440-55a/55b

Dec 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988aj.....96.1965r&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 96, Dec. 1988, p. 1965, 1966. Research supported by the Universidad de Chile and FON

Astronomy and Astrophysics

Astronomy

2

Red Dwarf Stars, Stellar Motions, Stellar Spectrophotometry, White Dwarf Stars, Absorption Spectra, Stellar Magnitude, Stellar Spectra

Scientific paper

Spectrophotometry of the common-proper-motion pair ESO 440-55a/55b indicates that 440-55a (mV ≈ 19.3) is a DZ 7 showing lines of Ca II, Ca I, Mg I, and Fe I, with no He or H lines present, while 440-55b is an M5 red dwarf with mV ≈ 20.2. Its proper motion μ = 0.22±0.04arcsec/yr (θ = 273°) at an estimated distance of 120 pc implies a tangential velocity vT = 125 km s-1 and a separation between the stars of 9.4×1015cm.

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