Table 4:
An overview of the models for the selection effects used to generate simulated observations of simulated OB associations, for the six major datasets discussed in Sects. 4.1 to 4.6. The sample bias, resulting from the choice of the sample alone, includes the observer's choice and the brightness constraint. All other constraints result from the properties of the telescope, detector, atmospheric conditions, and confusion with background stars, and are in this paper referred to as the instrument bias. For a detailed description of the constraints mentioned in this table we refer to Sect. 4.5 of Kouwenhoven (2006).
KO5 - (Kouwenhoven et al. 2005) - Visual binaries |
Observer's choice |
A and late-B members of Sco OB2 |
|
(incl. Hipparcos completeness) |
Brightness constraint |
,
 |
Separation constraint |
Eq. (7) |
Contrast constraint |
Eq. (4) |
Confusion constraint |
mag |
KO6 - (Kouwenhoven et al. 2007) - Visual binaries |
Observer's choice |
A selection (11%) of the KO5 sample |
Brightness constraint |
,
 |
Separation constraint |
Eq. (10) |
Contrast constraint |
Eq. (8) |
Confusion constraint |
Not applicable |
SHT - Shatsky & Tokovinin (2002) - Visual binaries |
Observer's choice |
B members of Sco OB2 |
|
(incl. Hipparcos completeness) |
Brightness constraint |
,
 |
Separation constraint |
Non-coronographic mode: Eq. (11) |
(idem) |
Coronographic mode: Eq. (14) |
Contrast constraint |
Non-coronographic mode: Eq. (13) |
(idem) |
Coronographic mode: Eq. (15) |
Confusion constraint |
mag,
mag, |
|
and
mag |
LEV - Levato et al. (1987) - Spectroscopic binaries |
Observer's choice |
B members of Sco OB2 |
|
(incl. Hipparcos completeness) |
Brightness constraint |
mag,
 |
Contrast constraint |
Not applicable |
Amplitude constraint |
Spectroscopic bias model SB-W |
Temporal constraint |
with T=2.74 year,
year, |
Aliasing constraint |
and
km s-1. |
Sampling constraint |
Not applied |
BRV - Brown & Verschueren (1997) - Spectroscopic binaries |
Observer's choice |
B members of Sco OB2 |
|
(incl. Hipparcos completeness) |
Brightness constraint |
,
 |
Contrast constraint |
Not applicable |
Amplitude constraint |
Spectroscopic bias model SB-W, |
Temporal constraint |
with T=2.25 year,
year, |
Aliasing constraint |
and
km s-1. |
Sampling constraint |
Not applied |
HIP - Hipparcos mission - Astrometric binaries |
Brightness constraint |
Hipparcos completeness |
Amplitude constraint |
Classification into the |
Temporal constraint |
categories (X), (C), (O), or (G) |
Aliasing constraint |
depending on the observables |
Sampling constraint |
of each binary system (see Table 6) |