NICER observation list: Target ID 252002
- Proposal Number = 2520
- Target ID = 252002
- Target Name = V407_Vul
- 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 |
| 2520020101 |
288.608 |
24.945 |
57.728 |
6.401 |
58632.3037 |
58632.5301 |
5980.0 |
52 |
3 |
VALIDATED |
58636.6 |
58826 |
| 2520020102 |
288.608 |
24.945 |
57.728 |
6.401 |
58633.0173 |
58633.6903 |
9193.0 |
52 |
3 |
VALIDATED |
58637.6 |
58827 |
| 2520020201 |
288.608 |
24.945 |
57.728 |
6.401 |
58780.1445 |
58780.1720 |
2248.0 |
52 |
3 |
VALIDATED |
58784.7 |
58974 |