NICER observation list: Target ID 252001
- Proposal Number = 2520
- Target ID = 252001
- Target Name = HM_CnC
- Proposal Title = MEASURING THE ORBITAL EVOLUTION OF ULTRACOMPACT WHITE DWARF BINARIES
- PI = TOD STROHMAYER
- Proposal Category = WHITE DWARFS AND CATACLYSMIC VARIABLES
- Cycle number = 2
- Observation Type = NOR
Abstract
The ultracompact white dwarf systems HM Cnc and V407 Vul represent unique opportunities to probe binary evolution driven by gravitational radiation and mass transfer. Initial {\it NICER} observations have provided new, precise frequency measurements in both systems, and a first indication for a slowing of the spin-up in HM Cnc. We propose additional observations to extend the timing baselines for each source, enabling new, unique probes of their orbital evolution.
| Obsid |
RA |
DEC |
l |
b |
Start |
End |
Exposure |
Number of
Modules |
Number of
Processing |
Status of
Processing |
Date of
Processing |
Public
date |
| 2520010101 |
121.597 |
15.458 |
206.926 |
23.396 |
58617.2073 |
58617.8157 |
18528.0 |
52 |
3 |
VALIDATED |
58624.1 |
58811 |
| 2520010201 |
121.597 |
15.458 |
206.925 |
23.396 |
58813.9908 |
58814.7292 |
16153.0 |
52 |
3 |
VALIDATED |
58818.6 |
59008 |