Early-type stars in the young open cluster NGC 2244 and in the Monoceros OB2 association - I. The multiplicity of O-type stars

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Volume 502 / No 3 (August II 2009)

A&A, 502 3 (2009) 937-950

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Table 9:

Summary^a of the optical properties of O-stars in NGC 2244 (*top part*) and Mon OB2 (*bottom*).
Name	Spectral type	$v~\sin{i}$	Spectroscopic status
HD 46 056	O8Vn	355 $~\pm~$ 21	C ? (rapid rotator)
HD 46149	O8V+B0-1V	78 $~\pm~$ 11 $^{\ddagger}$	SB2
HD 46 150	O5.5V((f))	97 $~\pm~$ 9	Bin?
HD 46 202	O9V	54 $~\pm~$ 15	C
HD 46 223	O4V((f⁺))	100 $~\pm~$ 17	C
HD 46 485	O8Vn	301 $~\pm~$ 25	C ? (rapid rotator)
HD 46 573	O7.5V((f))	110 $~\pm~$ 18	SB1
HD 46 966	O8.5V	63 $~\pm~$ 17	C
HD 48 279	ON7.5V	130 $~\pm~$ 13	C

^a The first column provides the name of each star studied in this paper. The next two columns give the spectral classification and the projected rotational velocity (in km s^-1) of the O-type stars, while the last column reports the status of the star as derived from our campaign: ``C'' means that our study did not reveal any indication of RV variability or of binarity, suggesting the star is probably single, ``Bin?'' indicates a potential binary, ``SB1'' corresponds to a spectroscopic binary where the second component has not been detected yet but where a period has been determined, whilst ``SB2'' corresponds to a spectroscopic binary where the two components are visible. $^{\ddagger}$ Notes: the reported value for HD 46149 is the projected rotational velocity for the primary.

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