C H A N D R A   S C I E N C E   C E N T E R
O B S E R V A T I O N   C A T A L O G

OBSID:
28362
 Title:
Spin Me Right Round: Testing Accretion Spin-up in Wide Binary Main-Sequence Carbon Stars
Investigator:
Roulston
 Observer:
Roulston, Benjamin
 Phone:
5189280062
 Email:
roulston@clarkson.edu
Target Name:
LP 758-43
 Sequence Number:
201676
 Instrument:
ACIS-S
 Grating:
NONE
 SI Mode:
TE_00A1AB
 Raster Scan:
N
 Annotated DOT:
AUG0524b

Proposal Number:
25200011
 Right Ascension:
327.41
 Declination:
-11.6412
 Status:
archived
 Start Date:
2024-08-05 15:55:48
Category:
STARS AND WD
 Type:
GO
 AO Cycle:
25
 Dither Flag:
Y
 Y Offset:
0
 Z Offset:
0
Est. Count Rate:
0.00156
 Order-1 Count Rate:

 Exposure Time:
32
 Time Remaining:
30.621
 Reqd Start Time:

 Reqd Stop Time:
Period:

 Epoch:

 Start of Period:

 End of Period:

 PS Margin:

 PE Margin:

 Max Segments:
0

ACIS Mode:
TE
 Standard?:
No
 BEP Mode:
F
 Dropped Chip Count:
0
 Optional Chips:
I3
On-Chip Summing?:
No
 Row Sum:

 Column Sum:

 Frame Time:
Subarray Mode:
NONE
 Starting Row:
0
 Row Count:
1023
 Subarray Frame Time:

Duty Cycle?:
No
 Cycle Count:
0
 Primary Exp Time:

 Secondary Exp Time:
Event Filter?:
No
 Filter Threshold:

 Filter Range:

 Bias Requested?:
No
 Bias Frequency:

 Bias After?:
No
 Spatial Window?:
No

Abstract:
The dwarf carbon stars are a class of post-mass transfer binaries that have accreted a significant amount of C-rich mass and angular momentum from a former AGB companion (now a white dwarf, usually undetected in the optical). We aim to use these dwarf carbon stars to better understand the physics behind mass and angular momentum transfer in binary systems, and the resulting spin-up and activity lifetimes of rejuvenated dwarfs. We propose to use joint Chandra+HST observations of 5 nearby dwarf carbon stars in wide binary systems to (1) probe the dC X-ray magnetic activity and diagnose mass-transfer spin-up, (2) constrain the coronal temperature of the dC, and (3) assess the remnant white dwarf companion cooling age through UV photometry.

psci Run:
62
 Processing Date:
Aug 11 2024
 psci Directory:
/nfs/maaxnew/r3/fn/acis128a/acis128.log
OBSID:
28362
 SIM Mode:
ACIS-S
 OTG Mode:
NONE
 Seq Number:
201676
 Target Name:
LP_758-43
 AO:
25
Start VCDU:
99932:096
 Start Time (UTC):
218:58264.207
 Stop Time (UTC):
219:02495.660
 Kilosecs:
30.6
 % Frames:
100.0
 # CCDs:
I3
# Frames:
9752
 # Events:
439399
 Events/sec:
14
 PSCI errors:
0
 % drops:
0.0
 Bias Errs:
0
 FP Temp:
-112.5
Parameter Block:
0x00a1a024
 Window Block:
-
 # Windows:
0
 FEP Mode:
Te3x3
 BEP Mode:
F
 Start Row:
0
 # Rows:
1024
Primary Exposure:
31
 Secondary Exposure:
0
 Duty Cycle:
0
 Summing?:
No
 Bias?:
Yes
 Trickle?:
Yes
 Bias Run:
62

pgf@space.mit.edu Tue Apr 8 9:48:31 EST 2025