BlX 77 , the SIMBAD biblio

1999A&A...344...83M - Astronomy and Astrophysics, volume 344, 83-96 (1999/4-1)

X-ray observations of the young open cluster Blanco 1.

MICELA G., SCIORTINO S., FAVATA F., PALLAVICINI R. and PYE J.

Abstract (from CDS):

We present results from two deep ROSAT HRI exposures on the Blanco 1 open cluster. Blanco 1 is one of the few open clusters at large distance from the Galactic Plane. This circumstance has suggested that it may have formed through a mechanism different from that responsible for the other nearby clusters. The age of Blanco 1 is rather uncertain since, depending on the adopted age indicator, it ranges between 30 and 90Myr. Many cluster members show chromospheric emission typical of young stars. The X-ray observations presented here reveal a high number of X-ray sources, consistent with the young age of the cluster. The typical X-ray luminosity of the cluster members is consistent with that of the Pleiades and significantly lower than the α Per members. These results suggest than the age of Blanco 1 is more similar to the age of the Pleiades than to that of α Per. The time sampling of the X-ray observations allows us to study the variability of the sources on time scales from hours to 6 months - 1 year.

Abstract Copyright:

Journal keyword(s): X-rays: stars - stars: coronae - Galaxy: open clusters and associations: individual: Blanco 1

Nomenclature: Table 4: BlX NN (Nos 1-88).

CDS comments: Table 2: objects 'NNN' = Cl* Blanco 1 ZS NNN, object W71 = Cl* Blanco 1 WGL 71.

Simbad objects: 176

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