Chandra Observations of the Pleiades Open Cluster: X-ray emission from late-B and A type Pleiades members

Details Chandra Observations of the Pleiades Open Cluster: X-ray emission from late-B and A type Pleiades members Chandra Observations of the Pleiades Open Cluster: X-ray emission from late-B and A type Pleiades members

Oct 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003csss...12..757d&link_type=abstract

The Future of Cool-Star Astrophysics: 12th Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun (2001 July 30 - August

Astronomy and Astrophysics

Astrophysics

Scientific paper

We present the analysis of 38.4 ks and 23.6 ks ACIS-I observations of the core of the Pleiades open cluster. Of the 101 sources detected in the 17 arcmin×17 arcmin region, 53 have not been cataloged at any other wavelength. Eighteen of 23 Pleiades members in the ACIS-I FOV were detected as X-ray sources with moderate to high time variability. Two of the early-type Pleiades members, HII 980 (B6 IV) and HII 956 (A7 V), are very bright X-ray sources, show soft X-ray spectra, and are variable with no obvious signs of flaring. K- and M-type cluster members with comparable X-ray luminosities have hard X-ray spectra and display strong flares. For non-flaring K- and M-type stars, LX is 1--2 orders of magnitude lower. One A-type star, HII 1284 (A9 V), has X-ray properties comparable to these non-flaring K-type stars. One star, HII 1338 (F3 V), exhibits an X-ray flare and two others, HII 1362 (A7 V) and HII 1375 (A0 V) are not detected. Despite the low number statistics, this pattern among late-B to early-F stars suggests that some early-type stars like HII 980 and HII 956 are intrinsic X-ray emitters. Some, like HII 1284 and HII 1338, may have late-type companions and some, like HII 1362 and HII 1375, may be single, inactive stars. X-ray spectra and light curves of a larger sample of intermediate-mass stars are needed to confirm this trend.

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