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:
28499
 Title:
R Mon: A Herbig Star With a Protostar X-ray Spectrum     
Investigator:
Skinner
 Observer:
Skinner, Stephen
 Phone:
303-492-4202
 Email:
stephen.skinner@colorado.edu
Target Name:
R Mon
 Sequence Number:
201674
 Instrument:
ACIS-S
 Grating:
NONE
 SI Mode:
TE_00972B
 Raster Scan:
N
 Annotated DOT:
DEC2523b

Proposal Number:
25200008
 Right Ascension:
99.7915
 Declination:
8.73603
 Status:
archived
 Start Date:
2023-12-27 08:57:14
Category:
STARS AND WD
 Type:
GO
 AO Cycle:
25
 Dither Flag:
Y
 Y Offset:
0
 Z Offset:
0
Est. Count Rate:
0.0023
 Order-1 Count Rate:

 Exposure Time:
11.5
 Time Remaining:
11.585
 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
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 embedded massive young Herbig Be star R Mon illuminates Hubble's Variable Nebula. It drives a jet and excites HH-39. A short 10 ks Chandra observation revealed an unusually hard X-ray spectrum and strong fluorescent Fe line (6.4 keV). The X-ray spectrum strikingly resembles that of some embedded massive protostars suggesting that R Mon is a rare Herbig star progenitor. Since the short exposure already shows intriguing results we propose a deeper observation of R Mon to obtain a spectrum of sufficient quality to better constrain its X-ray properties and test emission models based on shock and magnetic processes.

psci Run:
194
 Processing Date:
Jan 3 2024
 psci Directory:
/nfs/maaxnew/r3/fl/acis126b/acis126.log
OBSID:
28499
 SIM Mode:
ACIS-S
 OTG Mode:
NONE
 Seq Number:
201674
 Target Name:
R_Mon
 AO:
25
Start VCDU:
38688:104
 Start Time (UTC):
361:33471.519
 Stop Time (UTC):
361:45066.936
 Kilosecs:
11.6
 % Frames:
100.0
 # CCDs:
S2
# Frames:
3813
 # Events:
114976
 Events/sec:
9
 PSCI errors:
0
 % drops:
0.0
 Bias Errs:
0
 FP Temp:
-114.9
Parameter Block:
0x00972024
 Window Block:
-
 # Windows:
0
 FEP Mode:
Te3x3
 BEP Mode:
F
 Start Row:
0
 # Rows:
1024
Primary Exposure:
30
 Secondary Exposure:
0
 Duty Cycle:
0
 Summing?:
No
 Bias?:
Yes
 Trickle?:
Yes
 Bias Run:
194

pgf@space.mit.edu Thu Apr 3 20:00:53 EST 2025