A survey of stellar X-ray flares from the XMM-Newton serendipitous source catalogue: HIPPARCOS-Tycho cool stars

Free Access

Table 2

Summary of the X-ray variability characterisation.

Variability	Sample	Number	Number of	Number of events
type		of stars	light-curves	Total	Completely
					observed

Flare	CVS	63 (30)	76 (32)	133 (39)	116 (34)
	CLVS	8 (4)	8 (4)	11 (4)	11 (4)
	CVS+CLVS	70 (34)	84 (36)	144 (43)	127 (38)

Trend	CVS	10 (1)	11 (1)	11 (1)
Gradual	CVS	3 (1)	3 (1)	3 (1)
	CLVS	1 (0)	2 (0)	2 (0)
Indeterminate	CVS	6 (5)	6 (5)	6 (5)
	CLVS	2 (0)	2 (0)	2 (0)
Poor bgd sub?^a	CVS	2 (0)	2 (0)	2 (0)

All	CVS	76 (36)	96 (39)
	CLVS	11 (4)	12 (4)
	CVS+CLVS	84 (40)	108 (43)

Notes. Values in parentheses (...) relate to serendipitous observations, i.e. the star was not the target of the XMM observation.

^(a)

These occur as events within multi-event light-curves, and hence do not add to the total number of stars or light-curves.

Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.

Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.

Initial download of the metrics may take a while.