The chromospheric activity of low-mass stars in the Hyades

Details The chromospheric activity of low-mass stars in the Hyades The chromospheric activity of low-mass stars in the Hyades

Jun 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...374..142s&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 374, June 10, 1991, p. 142-149. Research supported by Perkin Fund and Lockh

Astronomy and Astrophysics

Astrophysics

51

Chromosphere, Dwarf Stars, K Stars, M Stars, Open Clusters, Stellar Mass, H Alpha Line, Spectral Line Width, Stellar Evolution, Stellar Spectrophotometry

Scientific paper

High-resolution spectra or narrow-band H-alpha photometry of 106 dwarf K and M stars in the Hyades cluster have been used to determine H-alpha equivalent widths. These data reveal a sequence of Hyades members with H-alpha in absorption for photospheric temperatures hotter than about 3500 K. Within this sequence, the dispersion about the mean equivalent width-color relation is only slightly larger than the measurement errors. A second sequence of Hyades members, characterized by H-alpha emission and significant scatter at a given color, appears at effective temperatures cooler than about 4000 K. This bifurcation in H-alpha properties at 4000 K coincides with a bifurcation in the rotational characteristics of Hyades stars: the dispersion in the rotational velocities of the hotter Hyades members at a given effective temperature is small while the cooler stars exhibit significant scatter in their rotational velocities. On the basis of these data, it is suggested that low-mass stars spin down to rotational velocities dependent upon mass and age, but independent of premain-sequence angular momentum.

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