Hubble Space Telescope
Cycle 11 General Observer Proposal
UV Observations of Eta Carinae to Detect Its Change
of State
Principal Investigator: Mr Deqian Yuan
Institution: Stony Brook U.
US
Electronic mail: deqian.yuan@stonybrook.edu
Scientific category:
Scientific keywords:
HOT STARS
UV OBERVATION, ETA CARINAE, BEHAVIOR
CHANGING
Instruments: ACS, STIS Proprietary period: 0
Cycle 11 primary orbits: 1
Cycle 11 parallel orbits: 0
Special Proposal Types: Innovative
Abstract
About a decade ago Eta Car’s brightening rate was suddenly accelerated and so far it’s
far more brightened in the near-UV.Also between 2003 and 2010 the stellar-wind emission
lines weakened by factors of 2 to 4 implying a rapiddecrease in its mass loss rate. The recent
secular changes are much stronger in the UV than at optical wavelengths and that’s what
we are going for.
Mr Deqian Yuan
UV Observations of Eta Carinae to Detect Its Change of State
Investigator
Mr Deqian Yuan
PI:
CoI:
Total number of investigators:
Institution
Stony Brook U.
Country
US
2
Total
DEC
V
orbits
Flags
0
0
Grand total orbit request
0
NOTE: This grand total (0) does not equal the sum of cycle 11 primary (1) and parallel (0) orbits
plus cycle 12 primary (0) and parallel (0) orbits plus cycle 13 primary (0) and parallel (0) orbits
on page 1
Observing Summary:
Target
RA
Configuration,mode,aperture
spectral elements
2
Mr Deqian Yuan
UV Observations of Eta Carinae to Detect Its Change of State
Scientific Justification
Description of the Observations
Special Requirements
Coordinated Observations
Justify Duplications
Previous HST Programs
3