Observations of late-type dwarfs of the young and old disk population using DDO photometry

Details Observations of late-type dwarfs of the young and old disk population using DDO photometry Observations of late-type dwarfs of the young and old disk population using DDO photometry

Dec 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...251..557u&link_type=abstract

Astrophysical Journal, Part 1, vol. 251, Dec. 15, 1981, p. 557-563. National Science Council of Republic of China

Astronomy and Astrophysics

Astrophysics

3

Dwarf Stars, Late Stars, M Stars, Star Distribution, Stellar Spectra, Stellar Spectrophotometry, Calcium, Emission Spectra, Stellar Mass, Stellar Motions, Stellar Parallax

Scientific paper

Intermediate-band DDO photometry is presented for 52 dwarf stars covering the spectral range from K2 to M2. All the stars have measures of the emission intensities of the H and K lines of calcium in their spectra, and it is suggested that thirty of these stars are young stars, based on their motion and calcium emission intensities. The DDO photometry clearly defines the locus of the K and early M dwarfs, and shows a small separation between the young and old stars, which is interpreted as a small difference in surface gravity and a possibly marginal difference in cyanogen intensity.

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