The region between 
galactic longitude in Carina has long been known
to
be rich in highly luminous and massive stars. The objective prism survey of
Graham &
Lynga (1965) revealed about 450 non-cluster OB-type stars in this part of the sky, and this
number increased with the publication of the "Luminous Stars in the Southern Milky Way"
catalog by Stephenson & Sanduleak (1971).
In that part of the Galaxy, the interstellar absorption is evidently small, and since the
Carina section is in a direction along a spiral arm, an extremely large young
structure can be seen on the line of sight. The clumping of these OB stars into associations
and also the connection of possible associations with young open clusters situated
in this field is widely discussed. In the Humphreys (1978) catalog, two associations are
separated in this direction: Car OB1 at 
and Car OB2 at 
, respectively. Nearly 460 non-cluster stars from the compact early-type group Car OB2
in the direction 
, 
in a square with approximate dimensions 30 arcmin have
been
studied photographically by Seggewiss (1970) and photoelectrically by
Garcia (1994) in
the UBV system. Kaltcheva & Georgiev (1993) have obtained uvby
photometry
for 16
stars of Car OB2. Shobbrook & Lynga (1994) collected uvby photometry of 100
early-type stars between 
, 
with the aim to investigate
the nature of the OB
associations there.
To continue the detailed study of the spatial distribution of the early non-cluster type stars in that direction uvby photometry of 130 stars in the
region , 
is presented in this paper. These stars are brighter than 10
mag
and earlier than B4 and are selected from the PPM catalog. About 90 of them are
included in the Stephenson & Sanduleak (1971) catalog. On the sky, they are situated in
two areas each with approximate dimensions 4.5 degrees on a side, centered at the
Car OB1 and Car OB2 fields. The program stars are plotted in Fig.
1 (click here) in Galactic coordinates. The boundaries of Car OB1 and Car OB2
according to the catalog of Humphreys (1978) are also shown.
Figure 1: The program stars plotted in Galactic coordinates