SUMMARY OF PROPOSAL 52018
BARTOL RESEARCH INSTITUTE
217 SHARP LAB
NEWARK
DE USA 19716
Tel: 302-831-4233 Fax: 302-831-1843
Medium: 4GBDAT
Subject: STARS
IOTA ORIONIS: A KEY COLLIDING WIND SYSTEM
ABSTRACT
We propose to observe the highly eccentric colliding-wind binary Iota Orionis (O9 III + B0 III) at two key orbital phases, for a total of 100 ksec. The goal is to investigate, in depth, colliding-wind physics in line-driven winds. Near periastron in this system the orientation is changing rapidly, so a long exposure offers critical insight into the wind-collision geometry. The effects of tidally enhanced mass loss can also be seen at this phase. Of additional interest is the potential for sudden radiative braking to set in at some critical separation. A complementary observation at apastron will allow a detailed comparison at the two orbital extremes, and test our understanding of the behavior of colliding winds as a function of binary separation and viewing angle.
CO-INVESTIGATORS
| CO-I NAME | INSTITUTE | COUNTRY |
|---|
| | | |
TARGETS
| TARGET NAME | PRI | RA | DEC | TIME | TC | OFF | GIS | SIS CNT | OBS |
|---|
| 1)IOTA ORIONIS | 2 | 83.8579 | -5.9100 | 75 ks | Y | N | P | 0.41000 | 1 |
| 2)IOTA ORIONIS | 2 | 83.8579 | -5.9100 | 25 ks | Y | N | P | 0.41000 | 1 |
TARGET 1
COORDINATED OBSERVATION: START: Sep 22,1997 at 00STOP: Sep 23,1997 at 180
Epoch: 50713.0000 Period: 29.13376000 Min: 0.9917Max: 0.0520
TARGET 2
COORDINATED OBSERVATION: START: Oct 7,1997 at 00STOP: Oct 7,1997 at 140
Epoch: 50728.0000 Period: 29.13376000 Min: 0.5070Max: 0.5270