[KRL2001] 57 , the SIMBAD biblio

2001AJ....121..337K - Astron. J., 121, 337-346 (2001/January-0)

Observations of the core of the Pleiades with the Chandra X-ray observatory.


Abstract (from CDS):

We present results from a 36 ks observation of the core of the Pleiades open cluster using ACIS-I on the Chandra X-Ray Observatory. We have detected 57 sources, most of which do not have previously known optical counterparts. Follow-up photometry indicates that many of the detections are likely to be active galactic nuclei, in accordance with extragalactic source counts, but some of the sources may be previously undiscovered low-mass members of the Pleiades. We discuss our data set and our findings about X-ray emission from early-type stars, as well as very late-type stars. In particular, the large X-ray fluxes, lack of variability, and hardness ratios of the four Pleiades B6 IV-F4 V stars suggest a tentative conclusion that Pleiades stars in this spectral type range are intrinsic X-ray sources rather than previously unknown binaries in which the X-ray emission is from a late-type companion. Also, the sensitivity of Chandra allowed us to detect nonflare X-ray emission from late M stars.

Abstract Copyright:

Journal keyword(s): Galaxy: Open Clusters and Associations: Individual: Name: Pleiades - Stars: Activity - Stars: Early-Type - Stars: Low-Mass, Brown Dwarfs

VizieR on-line data: <Available at CDS (J/AJ/121/337): table1.dat table2.dat>

Nomenclature: Table 1: [KRL2001] NN (Nos 1-57). Table 3: [KRL2001] JHHMMSS.ss+DDMMSS.ss N=15.

Simbad objects: 79

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