Results of the OBSS stellar survey
will definitively address five key scientific objectives having far-reaching
astrophysical and cosmological significance:
- Definitive calibration of the absolute luminosities of the standard candles
(the galactic Cepheid variables and the RR Lyrae stars) that are fundamental in
defining the distance scale to nearby
galaxies and clusters of galaxies.
- Calibration of the absolute luminosities of solar-neighborhood stars, including Population I and
II stars, thus enabling diverse studies of stellar
evolution and other important science. In the case
of Population II subdwarfs, this will allow the determination of the distances and ages of galactic
and extragalactic globular clusters with unprecedented accuracy.
- Definitive determination of the frequency of
solar-type stars orbited by brown dwarf companions in the mass range 10 to 80
MJupiter and with orbital periods as long as about twice the duration of
the mission. This will include an exploration of the
transition region between giant planets and brown
dwarfs, which appears to be in the range 10 to 30
- Proper motions and distances for individual
stars in star forming regions for determinations of
ages and kinematics.
- A study of the kinematic properties of the survey of 4x107 stars within
2.5 kpc of the Sun, and
in particular, assess the abundance and distribution
of dark matter in the galactic disk with much
greater sensitivity and completeness than previously possible.
The proposed investigation will also provide a
catalog of star positions, proper motions, and colors that will meet spacecraft navigation, guidance,
and attitude control needs of the United States Department of Defense (DoD) and NASA.
Please visit our OBSS Science page for more.
Next About OBSS page:
About the OBSS Contributions to NASA Themes and Strategic Plan