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SOFT CORONAL X-RAYS FROM β PICTORIS
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DOI：10.1088/0004-637X/750/1/78.png)
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摘要
En 中文
A-type stars are expected to be X-ray dark, yet weak emission has been detected from several objects in this class. We present new Chandra/HRC-I observations of the A5 V star beta Pictoris. It is clearly detected with a flux of (9 +/- 2) x 10(-4) counts s(-1). In comparison with previous data this constrains the emission mechanism and we find that the most likely explanation is an optically thin, collisionally dominated, thermal emission component with a temperature around 1.1 MK. We interpret this component as a very cool and dim corona, with log L-X/L-bol = -8.2 (0.2-2.0 keV). Thus, it seems that beta Pictoris shares more characteristics with cool stars than previously thought.
Keyword:
stars: activity
stars: chromospheres
stars: coronae
stars: individual: beta Pictoris
X-rays: stars
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IF:
5.4
论文数:
8.3W
被引数:
32.0W
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