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OBSID:
26176
 Title:
Measurements of Coronal Emission in the Hyades: We need more!    
Investigator:
Ag�eros
 Observer:
Agüeros, Marcel
 Phone:
2128546814
 Email:
marcel@astro.columbia.edu
Target Name:
Gaia DR2 124145479935111424
 Sequence Number:
201509
 Instrument:
ACIS-S
 Grating:
NONE
 SI Mode:
TE_00914B
 Raster Scan:
N
 Annotated DOT:
NOV0121a

Proposal Number:
20201075
 Right Ascension:
50.0417
 Declination:
31.0855
 Status:
archived
 Start Date:
2021-11-07 11:18:11
Category:
STARS AND WD
 Type:
CCT
 AO Cycle:
20
 Dither Flag:
Y
 Y Offset:
0
 Z Offset:
0
Est. Count Rate:
0.0078
 Order-1 Count Rate:

 Exposure Time:
10
 Time Remaining:
10.092
 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:
VF
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:
As the closest and one of the oldest accessible open clusters (47 pc and 625 Myr), the Hyades is a benchmark in any number of areas of stellar astrophysics. For example, Hyads have been used to test stellar models and to calibrate gyrochronology and metallicity scales. The X-ray picture, however, is far from satisfying: the X-ray census of Hyads is still woefully incomplete, consisting primarily of ROSAT observations of >1 M_solar stars. Given the wealth of new photometric data acquired by K2 and by TESS, the current limitations of the X-ray data are particularly galling, as we cannot fully exploit the cluster to place constraints on the still poorly understood age-rotation-activity relation. We therefore propose to target the Hyades as a Chandra CCT program. Every new X-ray observation of a Hyad can be matched to our extensive and growing database of complementary measurements to deepen our understanding of the connection between rotation and activity in low-mass stars.

Remarks:
N/A

psci Run:
266
 Processing Date:
Nov 16 2021
 psci Directory:
/nfs/maaxnew/r3/fc/acis117e/acis117.log
OBSID:
26176
 SIM Mode:
ACIS-S
 OTG Mode:
NONE
 Seq Number:
201509
 Target Name:
Gaia_DR2_124145
 AO:
20
Start VCDU:
87445:056
 Start Time (UTC):
311:41525.841
 Stop Time (UTC):
311:51628.226
 Kilosecs:
10.1
 % Frames:
100.0
 # CCDs:
S1
# Frames:
3322
 # Events:
90933
 Events/sec:
9
 PSCI errors:
0
 % drops:
0.0
 Bias Errs:
0
 FP Temp:
-114.2
Parameter Block:
0x00914014
 Window Block:
-
 # Windows:
0
 FEP Mode:
Te5x5
 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:
266

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