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:
27891
 Title:
Young Massive Stars and Cores in the Trifid Nebula Center    
Investigator:
Schulz
 Observer:
Schulz, Norbert
 Phone:
617 301 0830
 Email:
norbert@mit.edu
Target Name:
Trifid Nebula
 Sequence Number:
201468
 Instrument:
ACIS-S
 Grating:
HETG
 SI Mode:
TE_00958B
 Raster Scan:
N
 Annotated DOT:
JUN0523a

Proposal Number:
23200124
 Right Ascension:
270.596
 Declination:
-23.0331
 Status:
archived
 Start Date:
2023-06-06 01:38:59
Category:
STARS AND WD
 Type:
GO
 AO Cycle:
23
 Dither Flag:
Y
 Y Offset:
0
 Z Offset:
0
Est. Count Rate:
0.05
 Order-1 Count Rate:
0.045
 Exposure Time:
11
 Time Remaining:
10.983
 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:
2
 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:
We propose to observe the core of the Trifid Nebula for 175 ks with the HETGS in order to obtain as first high resolution X-ray spectrum of the central illuminating star HD 164492A (O7.5V). one of the youngest massive stars in a nearby (< 2 kpc) massive stellar cluster. We intend to measure line widths and address the fact that this young massive star is X-ray faint. We also obtain high resolution spectra of other trapezium members, HD 164492B (A2Ia) to detect possible coronal emissions wither from a HAEBE star or unseen companion, and HD 164492C/C2 (B6Ve/unknown) and verify their coronal nature.

psci Run:
260
 Processing Date:
Jun 29 2023
 psci Directory:
/nfs/maaxnew/r3/fj/acis124d/acis124.log
OBSID:
27891
 SIM Mode:
ACIS-S
 OTG Mode:
HETG
 Seq Number:
201468
 Target Name:
Trifid_Nebula
 AO:
23
Start VCDU:
24800:056
 Start Time (UTC):
157:07167.036
 Stop Time (UTC):
157:18163.754
 Kilosecs:
11.0
 % Frames:
100.0
 # CCDs:
S4
# Frames:
3501
 # Events:
297158
 Events/sec:
27
 PSCI errors:
0
 % drops:
0.0
 Bias Errs:
0
 FP Temp:
-115.4
Parameter Block:
0x00958024
 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:
260

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