Computer Science
Scientific paper
Feb 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999noao.prop...22s&link_type=abstract
NOAO Proposal ID #1999A-0022
Computer Science
Scientific paper
The existence of ultra-rapidly rotating G-K stars in open clusters has been explained by a loss of braking due to dynamo saturation. However, there is an alternative explanation, namely that these stars all have their magnetic fields concentrated in polar spots and thus have no torque arms for efficient braking. In the present program, we propose to search for new G-K rapid rotators in the field (because they are much brighter) - especially in the Hertzsprung gap - by means of a spectroscopic survey of Ca II H& K emission in a brightness and color-limited sample of Hipparcos stars. Strong Ca II H& K emission is indirectly a sign of rapid rotation and an extended sample, especially of evolved G-K stars, is urgently needed to test the polar- spot hypothesis. In the first part of this survey, carried out with the coudee feed in September 1998, covering right ascensions between 18^h and 5^h, we identified 118 new H& K emission line stars out of 469 targets observed. The present proposal aims to complete the sky coverage for right ascensions between 6^h and 17^h.
Granzer Thomas
Strassmeier Klaus G.
Washuettl Albert
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