A study of the stellar population in the LYNDS 1641 dark cloud. IV - The Einstein X-ray sources

Details A study of the stellar population in the LYNDS 1641 dark cloud. IV - The Einstein X-ray sources A study of the stellar population in the LYNDS 1641 dark cloud. IV - The Einstein X-ray sources

Oct 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...362..168s&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 362, Oct. 10, 1990, p. 168-190. Research supported by NSF.

Astronomy and Astrophysics

Astrophysics

59

Molecular Clouds, Open Clusters, Pre-Main Sequence Stars, Star Formation, Stellar Coronas, X Ray Sources, Dark Matter, Heao 2, Hertzsprung-Russell Diagram, Infrared Photometry, Near Infrared Radiation

Scientific paper

The properties of 65 X-ray sources identified on four overlapping Einstein IPC frames in the northern portion of the L1641 giant molecular cloud are discussed. The X-ray sources have ages ranging from 300,000 to 10 million yr, extending to considerably greater ages than the IRS sample. Examination of X-ray luminosities leads to the conclusion that L(x) is proportional to the surface area of the star; comparison with the Extended Medium Sensitivity Survey sample shows that the premain-sequence stars form an extension of the relationship found by Fleming et al. (1989) for late-type main-sequence stars with an upper envelope determined by coronal 'saturation'. No evidence is found in this sample to support the proposal that X-ray emission is 'quenched' by circumstellar gas ejected by the more extreme T Tauri stars.

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