Context :

Aims : We plan to identify the members of the Bochum 7 association by performing simultaneous astrometric and spectrophotometric analyses , and estimate its distance and evolutionary stage .

Methods : We used our own visual spectroscopic and UBV photometric data of a 30 ’ \times 30 ’ region centered at \alpha = 8 ^ { h } 44 ^ { m } 47.2 ^ { s } , \delta = - 45 ^ { \circ } 58′55.5″ .
This information enabled us to estimate the spectral classification and distance of all stars present in the region .
The proper motion was analyzed with data of the UCAC 5 catalog and was used to identify the members of this association .
We added JHK data from 2MASS and IRAS catalogs to check for the presence of infrared ( IR ) excess stars

Results : We found that Bochum 7 is an OB association with at least 27 identified stellar members ( l = 265 ^ { \circ } .12 , b = -2 ^ { \circ } ) at a distance of \simeq 5640 pc .
Its proper motion is \mu _ { \alpha } cos \delta = -4.92 \pm 0.08 mas yr ^ { -1 } , \mu _ { \delta } = 3.26 \pm 0.08 mas yr ^ { -1 } .
We derived an average heliocentric radial velocity of \sim 35 km s ^ { -1 } and were able to confirm the binary nature of the ( ALS 1135 ) system and detect four new binary star candidates .
Analysis of data for massive Bo 7 star candidates points towards a young age ( \leq 3 \times 10 ^ { 6 } years old ) for the association , although the presence of a previous episode of star formation remains to be analyzed .

Conclusions :