A halo blue straggler on a highly eccentric retrograde orbit

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Volume 517 (July 2010)

A&A, 517 (2010) A36

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Table 1:

Results of the analysis of J1300+0422.
V (mag)^a	15.12 $\pm$ 0.02	E(B-V) (mag)^b	0.05 $\pm$ 0.02
$\mu_\alpha\cos(\delta)$ ( $\rm {mas~yr^{-1}}$ )	-11.9 $\pm$ 1.7	$\mu_\delta$ ( $\rm {mas~yr^{-1}}$ )	-19.7 $\pm$ 1.4
$n_{\rm ep}$	12	$n_{\rm gal}$	15
$T_{\rm eff}$ (K)	7350 $\pm$ 200	$\log{g}$ (cgs)	4.00 $\pm$ 0.15
[M/H]	-1.2 $\alpha$	$M/M_\odot$	1.15 $\pm$ 0.10
$v_{\rm rad}$ ( $\rm {km~s^{-1}}$ )	504.6 $\pm$ 5	$v_{\rm rot} \sin i$ ( $\rm {km~s^{-1}}$ )	-
d (kpc)	3.25 $\pm$ 0.62	$v_{\rm GRF}$ ( $\rm {km~s^{-1}}$ )	467 ⁺⁴¹_-21
$v_{\rm esc}$ ( $\rm {km~s^{-1}}$ )	529	$v_{\rm esc}^{\rm a}$	708

Notes. The resulting GRF velocity $v_{\rm GRF}$ and the local escape velocity $v_{\rm esc}$ , also in a more massive halo $v_{\rm esc}^{\rm a}$ , are given. ^(a) The visual magnitude has been derived from SDSS photometry following Jordi et al. (2006). ^(b) The interstellar colour excess E(B-V) has been determined by comparing the observed colours to synthetic ones from the model spectral energy distribution.

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