A Study of the Stellar Population in the Lynds 1641 Dark Cloud. IV. The Einstein X-Ray Sources
Abstract
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.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- October 1990
- DOI:
- 10.1086/169253
- Bibcode:
- 1990ApJ...362..168S
- Keywords:
-
- 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;
- Astrophysics;
- CLUSTERS: OPEN;
- NEBULAE: INDIVIDUAL ALPHANUMERIC: L1641 (LYNDS 1641);
- STARS: CORONAE;
- STARS: FORMATION;
- STARS: PRE--MAIN-SEQUENCE;
- STARS: X-RAYS;
- X-RAYS: SOURCES