Computer Science – Performance
Scientific paper
Dec 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apjs...68..803b&link_type=abstract
Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 68, Dec. 1988, p. 803-819.
Computer Science
Performance
23
G Stars, Giant Stars, H Alpha Line, K Stars, Stellar Spectra, Absorption Spectra, Chromosphere, Line Spectra, Stellar Rotation
Scientific paper
Initial results from an ongoing program to monitor the long-term behavior of the H-alpha line in active-chromosphere stars are presented. The performance of a Reticon system used to obtain H-alpha spectra with 0.3 A resolution and 100:1 SNR is discussed, and results for six G-K giants are presented. The rapidly rotating G0 III stars 31 Com and 35 Cnc show no signs of activity at H-alpha and thus have normal H-alpha absorption profiles. 24 UMa and Delta CrB both show emission at H-alpha, which is more easily seen as a high residual intensity compared with standard stars of the same spectral type. The RS CVn binaries Sigma Gem and Lambda And show H-alpha features that are significantly affected by emission. Lambda And shows the weakest H-alpha absorption line of these six stars, thus the highest inferred activity level.
Bopp Bernard William
Dempsey Robert C.
Maniak Steven
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