Stars and brown dwarfs in the σ Orionis cluster - II. A proper motion study

Home

All issues

Volume 514 (May 2010)

A&A, 514 (2010) A18

Full HTML

Free Access

Table 2:

Companions in visual binary and multiple systems with incorrect USNO-B1 proper motions.
No.	$\rho$	$\theta$	$\mu_\alpha \cos{\delta}$	$\mu_\delta$	J
	[arcsec]	[deg]	[mas a^-1]	[mas a^-1]	[mag]
02^a	7.2	242	+3.9 $\pm$ 0.7	-2.3 $\pm$ 0.7	14.53 $\pm$ 0.03
04^b	8.1	168	+6.1 $\pm$ 0.9	-8.1 $\pm$ 1.2	16.08 $\pm$ 0.08
09	5.3	182	-8.2 $\pm$ 1.4	-13.6 $\pm$ 1.0	15.19 $\pm$ 0.05
12	6.0	335	+10.5 $\pm$ 1.3	-7.7 $\pm$ 0.8	16.27 $\pm$ 0.08
18	6.6	292	+5.4 $\pm$ 1.8	-17.2 $\pm$ 2.1	14.49 $\pm$ 0.04
20	4.8	234	-2.0 $\pm$ 1.0	-11.5 $\pm$ 1.0	15.16 $\pm$ 0.04
21	7.5	152	+4.6 $\pm$ 0.7	-16.3 $\pm$ 1.1	13.07 $\pm$ 0.03
22	5.6	311	+1.0 $\pm$ 0.7	-4.5 $\pm$ 0.6	14.36 $\pm$ 0.04
38	6.6	324	-9.6 $\pm$ 0.6	+9.7 $\pm$ 0.6	14.47 $\pm$ 0.03
42^c	4.5	237	+1.3 $\pm$ 1.9	-10.6 $\pm$ 0.8	16.78 $\pm$ 0.03

Notes. ^(a) The visual companion to star No. 02 is appreciably brighter in the visible ( $\overline{B_J} = 18.7$ mag versus $\overline{B_J} = 19.8$ mag) and fainter in the near infrared ( $K_{\rm s} = 15.41 \pm0.08$ mag versus $K_{\rm s} = 13.59 \pm 0.04$ mag) than the star No. 02.
^(b) There is an additional visual companion to star No. 04. It is a faint, blue source at $\rho \sim 4.1$ arcsec, $\theta \sim 217$ deg, only resolved by 2MASS and UKIDSS ( $J = 16.43\pm0.10$ mag), with similarly low proper motion.
^(c) UKIDSS J-band magnitude transformed into the 2MASS one by adding the offset $J_{\rm 2MASS} - J_{\rm UKIDSS}$ measured for Mayrit 1610344. There are two additional visual companions to this star: USNO-A2.0 0825-01615246, a relatively blue star at 7.8 arcsec to the southwest and with a proper motion ( $\mu_\alpha \cos{\delta}$ , $\mu_\delta) = (+2.9\pm1.2$ , $-7.6 \pm0.7$ ) mas a^-1, and a faint red source at about 3 arcsec to the southeast only resolved by UKIDSS ( $K \approx 16.3$ mag).

Source LaTeX | All tables | In the text

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.