ZYJHK survey of Upper Sco association (Lodieu+, 2006)

Lodieu, N.; Hambly, N. C.; Jameson, R. F.
Bibliographical reference

VizieR On-line Data Catalog: J/MNRAS/373/95. Originally published in: 2006MNRAS.373...95L

Advertised on:
8
2007
Number of authors
3
IAC number of authors
0
Citations
0
Refereed citations
0
Description
We present the results of a 9.3-deg2 infrared (ZYJHK) survey Upper Scorpius association extracted from the UKIRT Infrared Deep Sky Survey (UKIDSS) Galactic Cluster Survey Early Data Release (Dye et al., 2006MNRAS.372.1227D). We have selected a total of 112 candidates from the (Z-J, Z) colour-magnitude diagram over the Z=12.5-20.5 magnitude range, corresponding to M=0.25-0.01M{sun} at an age of 5Myr and a distance of 145pc. Additional photometry in J and K filters revealed most of them as reddened stars, leaving 32 possible members. Among them, 15 have proper motion consistent with higher-mass members from Hipparcos and optical spectra with strong Hα in emission and weak gravity features. We have also extracted two lower-mass candidate members for which no optical spectra are in hand. Three members exhibit strong Hα equivalent widths (>20{AA}), suggesting that they could still undergo accretion, whereas two other dwarfs show signs of chromospheric activity. The likelihood of the binarity of a couple of new stellar and substellar members is discussed as well. (1 data file).