Online material

Appendix A: Table new members

Appendix B: Classification of stars in the AAOmega field

The full sample of over 600 stars in the AAOmega field assigned to a fibre in addition to the USco member candidates is available electronically (Table B.1). An example of the table is provided below for guidance only. Columns 1 and 2 give the coordinates (J2000); Cols. 3–7 the ZYJHK photometry, Cols. 8–9 the proper motions (in mas/yr) in right ascension and declination, respectively; Col. 10 the spectral types based on the visual comparison with the templates listed below; and Col. 11 the name give prior to the fibre assignment.

This sample can be divided into several groups, each of them characterised by one template with a good quality spectrum (see Fig. B.2). Spectral types of M dwarfs should be accurate to half a subclass whereas others are tentative spectral types. The templates are:

• UGCS J160709.43−234031.8 or field6062 classified as M1.5;

• UGCS J160709.43−234031.8 or field3147 classified as M2;

• UGCS J160709.43−234031.8 or field4452 classified as M2.5;

• UGCS J160709.43−234031.8 or field2656 classified as M3–M3.5;

• UGCS J160709.43−234031.8 or field1771 classified as M4;

• UGCS J160709.43−234031.8 or field6901 classified as M4.5;

• UGCS J160709.43−234031.8 or field1296 classified as M5.25–5.5;

• UGCS J160709.43−234031.8 or field633 classified as M5.75–M6;

• Four objects classified as dM6 +  i.e. later than M6;

• UGCS J160634.44−231517.7 or field3830 is classified as a late-K/early-M;

• UGCS J160709.43−234031.8 or field2636 is classified as a late-K/early-M;

• UGCS J160733.42−224609.4 or field477 is classified as late-K/early-M and show a different level of reddening than field3830. The position of these objects in the (H−K, J−H) colour-colour diagram (Fig. B.1) corroborate the classification as dwarfs rather than giants (e.g. Fig. 5 in Dobbie et al. 2002a). However, we can not rule our that some giants are included in this sample;

• UGCS J160544.57−231310.6 or field522 is classified as a late-K dwarf or giant;

• UGCS J160632.31−224817.2 or field1530 is classified as a late-G giant. Sources in this group show similar features but may have different levels of reddening;

• Two white dwarfs: UGCS J160757.34−231248.5 (field4930) and UGCS J160917.16−231020.1 (field1861);

• Three young active flare M dwarfs, see Sect. 5.4;

• 18 objects unclassified;

• 11 objects with no signal.

	Fig. B.1 (H−K, J−H) two-colour diagram for stars in the AAOmega field.
Open with DEXTER

	Fig. B.2 Example of optical spectra obtained with AAT/AAOmega for for stars in the AAOmega field not selected as photometric candidates. Spectra are normalised at 7500 Å and offset for clarity. Left: a sample of field M dwarfs with spectral types ranging from M1 to M6. Right: a sample of late-K/early-M dwarfs, giants, white dwarfs, and young active M dwarfs.
Open with DEXTER

Appendix C: Proper-motion non-members

Appendix D: Candidates with proper motion and equivalent widths satisfying membership

© ESO, 2011