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:
26180
 Title:
The stellar wind of the B supergiant V662 Cas: smooth and cool.   
Investigator:
Torrejon
 Observer:
Torrejon, Jose
 Phone:
(34)-965909580
 Email:
jmt@ua.es
Target Name:
4U0114+65
 Sequence Number:
402210
 Instrument:
ACIS-S
 Grating:
HETG
 SI Mode:
TE_0088EB
 Raster Scan:
N
 Annotated DOT:
NOV0121a

Proposal Number:
22400297
 Right Ascension:
19.5113
 Declination:
65.2916
 Status:
archived
 Start Date:
2021-11-04 13:42:42
Category:
BH AND NS BINARIES
 Type:
GO
 AO Cycle:
22
 Dither Flag:
Y
 Y Offset:
0
 Z Offset:
0
Est. Count Rate:
0.1
 Order-1 Count Rate:
0.7
 Exposure Time:
10
 Time Remaining:
9.951
 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:
S0 S5
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 unique high resolution capabilities of Chandra HETG gratings will allow to study in depth the stellar wind properties of the early B supergiant V662 Cas, the mass donor of the wind accreting pulsar 4U0114+65. The goal is to put observational constraints on the current models of stellar winds in massive stars using the point like source of ionizing X-rays as a probe. Together with existing observations, we will study the stellar wind clumping across the spectral sequence. In particular, we want to study the wind clumping of V662 Cas, the coolest (B1I) among the massive donors in any HMXB, and answer fundamental questions: is the wind clumped or smooth at r = 1.5R*? What is the role of the bistability jump in the formation/destruction of clumps?

psci Run:
253
 Processing Date:
Nov 16 2021
 psci Directory:
/nfs/maaxnew/r3/fc/acis117e/acis117.log
OBSID:
26180
 SIM Mode:
ACIS-S
 OTG Mode:
HETG
 Seq Number:
402210
 Target Name:
4U0114+65
 AO:
22
Start VCDU:
79810:048
 Start Time (UTC):
308:50983.630
 Stop Time (UTC):
308:60946.593
 Kilosecs:
10.0
 % Frames:
100.0
 # CCDs:
S6
# Frames:
3074
 # Events:
462821
 Events/sec:
46
 PSCI errors:
0
 % drops:
0.0
 Bias Errs:
1
 FP Temp:
-114.4
Parameter Block:
0x0088e024
 Window Block:
-
 # Windows:
0
 FEP Mode:
Te3x3
 BEP Mode:
F
 Start Row:
0
 # Rows:
1024
Primary Exposure:
32
 Secondary Exposure:
0
 Duty Cycle:
0
 Summing?:
No
 Bias?:
Yes
 Trickle?:
Yes
 Bias Run:
253

pgf@space.mit.edu Mon Mar 31 10:36:39 EST 2025